1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This package contains global flags set by the initialization routine from
33 -- the command line and referenced throughout the compiler, the binder, or
34 -- other GNAT tools. The comments indicate which options are used by which
35 -- programs (GNAT, GNATBIND, GNATLINK, GNATMAKE, GPRMAKE, etc).
37 -- Some flags are labelled "PROJECT MANAGER". These are used by tools that
38 -- use the Project Manager. These tools include gnatmake, gnatname, the gnat
39 -- driver, gnatclean, gprbuild and gprclean.
41 with Hostparm; use Hostparm;
42 with Types; use Types;
44 pragma Warnings (Off);
45 -- This package is used also by gnatcoll
46 with System.Strings; use System.Strings;
47 with System.WCh_Con; use System.WCh_Con;
52 ----------------------------------------------
53 -- Settings of Modes for Current Processing --
54 ----------------------------------------------
56 -- The following mode values represent the current state of processing.
57 -- The values set here are the default values. Unless otherwise noted,
58 -- the value may be reset in Switch-? with an appropriate switch. In
59 -- some cases, the values can also be modified by pragmas, and in the
60 -- case of some binder variables, Gnatbind.Scan_Bind_Arg may modify
61 -- the default values.
63 Ada_Bind_File : Boolean := True;
65 -- Set True if binder file to be generated in Ada rather than C
67 type Ada_Version_Type is (Ada_83, Ada_95, Ada_2005, Ada_2012);
68 pragma Ordered (Ada_Version_Type);
69 -- Versions of Ada for Ada_Version below. Note that these are ordered,
70 -- so that tests like Ada_Version >= Ada_95 are legitimate and useful.
71 -- Think twice before using "="; Ada_Version >= Ada_2012 is more likely
72 -- what you want, because it will apply to future versions of the language.
74 Ada_Version_Default : constant Ada_Version_Type := Ada_2005;
75 pragma Warnings (Off, Ada_Version_Default);
77 -- Default Ada version if no switch given. The Warnings off is to kill
78 -- constant condition warnings.
80 -- WARNING: some scripts rely on the format of this line of code. Any
81 -- change must be coordinated with the scripts requirements.
83 Ada_Version : Ada_Version_Type := Ada_Version_Default;
85 -- Current Ada version for compiler, as set by configuration pragmas,
86 -- compiler switches, or implicitly (to Ada_Version_Runtime) when a
87 -- predefined or internal file is compiled.
89 Ada_Version_Explicit : Ada_Version_Type := Ada_Version_Default;
91 -- Like Ada_Version, but does not get set implicitly for predefined
92 -- or internal units, so it reflects the Ada version explicitly set
93 -- using configuration pragmas or compiler switches (or if neither
94 -- appears, it remains set to Ada_Version_Default). This is used in
95 -- the rare cases (notably for pragmas Preelaborate_05 and Pure_05)
96 -- where in the run-time we want the explicit version set.
98 Ada_Version_Runtime : Ada_Version_Type := Ada_2012;
100 -- Ada version used to compile the runtime. Used to set Ada_Version (but
101 -- not Ada_Version_Explicit) when compiling predefined or internal units.
103 Ada_Final_Suffix : constant String := "final";
104 Ada_Final_Name : String_Ptr := new String'("ada" & Ada_Final_Suffix);
106 -- The name of the procedure that performs the finalization at the end of
107 -- execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
109 Ada_Init_Suffix : constant String := "init";
110 Ada_Init_Name : String_Ptr := new String'("ada" & Ada_Init_Suffix);
112 -- The name of the procedure that performs initialization at the start
113 -- of execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
115 Ada_Main_Name_Suffix : constant String := "main";
117 -- The suffix for Ada_Main_Name. Defined as a constant here so that it
118 -- can be referenced in a uniform manner to create either the default
119 -- value of Ada_Main_Name (declared below), or the non-default name
120 -- set by Gnatbind.Scan_Bind_Arg.
122 Ada_Main_Name : String_Ptr := new String'("ada_" & Ada_Main_Name_Suffix);
124 -- The name of the Ada package generated by the binder (when in Ada mode).
125 -- This variable may be modified by Gnatbind.Scan_Bind_Arg.
127 Address_Clause_Overlay_Warnings : Boolean := True;
129 -- Set False to disable address clause warnings
131 Address_Is_Private : Boolean := False;
133 -- Set True if package System has the line "type Address is private;"
135 All_Errors_Mode : Boolean := False;
137 -- Flag set to force display of multiple errors on a single line and
138 -- also repeated error messages for references to undefined identifiers
139 -- and certain other repeated error messages. Set by use of -gnatf.
141 All_Sources : Boolean := False;
143 -- Set to True to require all source files to be present. This flag is
144 -- directly modified by gnatmake to affect the shared binder routines.
146 Alternate_Main_Name : String_Ptr := null;
148 -- Set to non null when Bind_Alternate_Main_Name is True. This value
149 -- is modified as needed by Gnatbind.Scan_Bind_Arg.
151 ASIS_Mode : Boolean := False;
153 -- Enable semantic checks and tree transformations that are important
154 -- for ASIS but that are usually skipped if Operating_Mode is set to
155 -- Check_Semantics. This flag does not have the corresponding option to set
156 -- it ON. It is set ON when Tree_Output is set ON, it can also be set ON
157 -- from the code of GNSA-based tool (a client may need to set ON the
158 -- Back_Annotate_Rep_Info flag in this case. At the moment this does not
159 -- make very much sense, because GNSA cannot do back annotation).
161 Assertions_Enabled : Boolean := False;
163 -- Enable assertions made using pragma Assert
165 Assume_No_Invalid_Values : Boolean := False;
167 -- Normally, in accordance with (RM 13.9.1 (9-11)) the front end assumes
168 -- that values could have invalid representations, unless it can clearly
169 -- prove that the values are valid. If this switch is set (by -gnatB or by
170 -- pragma Assume_No_Invalid_Values (Off)), then the compiler assumes values
171 -- are valid and in range of their representations. This feature is now
172 -- fully enabled in the compiler.
174 Back_Annotate_Rep_Info : Boolean := False;
176 -- If set True, enables back annotation of representation information
177 -- by gigi, even in -gnatc mode. This is set True by the use of -gnatR
178 -- (list representation information) or -gnatt (generate tree). It is
179 -- also set true if certain Unchecked_Conversion instantiations require
180 -- checking based on annotated values.
182 Back_End_Handles_Limited_Types : Boolean;
183 -- This flag is set true if the back end can properly handle limited or
184 -- other by reference types, and avoid copies. If this flag is False, then
185 -- the front end does special expansion for conditional expressions to make
186 -- sure that no copy occurs. If the flag is True, then the expansion for
187 -- conditional expressions relies on the back end properly handling things.
188 -- Currently the default is False for all cases (set in gnat1drv). The
189 -- default can be modified using -gnatd.L (sets the flag True).
191 Bind_Alternate_Main_Name : Boolean := False;
193 -- True if main should be called Alternate_Main_Name.all.
194 -- This variable may be set to True by Gnatbind.Scan_Bind_Arg.
196 Bind_Main_Program : Boolean := True;
198 -- Set to False if not binding main Ada program
200 Bind_For_Library : Boolean := False;
202 -- Set to True if the binder needs to generate a file designed for building
203 -- a library. May be set to True by Gnatbind.Scan_Bind_Arg.
205 Bind_Only : Boolean := False;
206 -- GNATMAKE, GPRMAKE, GPRBUILD
207 -- Set to True to skip compile and link steps
208 -- (except when Compile_Only and/or Link_Only are True).
210 Blank_Deleted_Lines : Boolean := False;
212 -- Output empty lines for each line of preprocessed input that is deleted
213 -- in the output, including preprocessor lines starting with a '#'.
215 Brief_Output : Boolean := False;
217 -- Force brief error messages to standard error, even if verbose mode is
218 -- set (so that main error messages go to standard output).
220 Build_Bind_And_Link_Full_Project : Boolean := False;
222 -- Set to True to build, bind and link all the sources of a project file
225 Check_Object_Consistency : Boolean := False;
226 -- GNATBIND, GNATMAKE
227 -- Set to True to check whether every object file is consistent with
228 -- its corresponding ada library information (ALI) file. An object
229 -- file is inconsistent with the corresponding ALI file if the object
230 -- file does not exist or if it has an older time stamp than the ALI file.
231 -- Default above is for GNATBIND. GNATMAKE overrides this default to
232 -- True (see Make.Initialize) since we normally do need to check source
233 -- consistencies in gnatmake.
235 Check_Only : Boolean := False;
237 -- Set to True to do checks only, no output of binder file
239 Check_Policy_List : Node_Id := Empty;
241 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
242 -- that are linked through the Next_Pragma fields, with the list being
243 -- terminated by Empty. The order is most recently processed first. Note
244 -- that Push_Scope and Pop_Scope in Sem_Ch8 save and restore the value
245 -- of this variable, implementing the required scope control for pragmas
246 -- appearing a declarative part.
248 Check_Readonly_Files : Boolean := False;
250 -- Set to True to check readonly files during the make process
252 Check_Source_Files : Boolean := True;
253 -- GNATBIND, GNATMAKE
254 -- Set to True to enable consistency checking for any source files that
255 -- are present (i.e. date must match the date in the library info file).
256 -- Set to False for object file consistency check only. This flag is
257 -- directly modified by gnatmake, to affect the shared binder routines.
259 Check_Switches : Boolean := False;
260 -- GNATMAKE, GPRMAKE, GPBUILD
261 -- Set to True to check compiler options during the make process
263 Check_Unreferenced : Boolean := False;
265 -- Set to True to enable checking for unreferenced entities other
266 -- than formal parameters (for which see Check_Unreferenced_Formals)
268 Check_Unreferenced_Formals : Boolean := False;
270 -- Set True to check for unreferenced formals. This is turned on by
271 -- -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.
273 Check_Withs : Boolean := False;
275 -- Set to True to enable checking for unused withs, and also the case
276 -- of withing a package and using none of the entities in the package.
278 CodePeer_Mode : Boolean := False;
280 -- Enable full CodePeer mode (SCIL generation, disable switches that
281 -- interact badly with it, etc...).
283 Commands_To_Stdout : Boolean := False;
285 -- True if echoed commands to be written to stdout instead of stderr
287 Comment_Deleted_Lines : Boolean := False;
289 -- True if source lines removed by the preprocessor should be commented
290 -- in the output file.
292 Compile_Only : Boolean := False;
293 -- GNATMAKE, GNATCLEAN, GPRMAKE, GPBUILD, GPRCLEAN
294 -- GNATMAKE, GPRMAKE, GPRMAKE:
295 -- set to True to skip bind and link steps (except when Bind_Only is
297 -- GNATCLEAN, GPRCLEAN:
298 -- set to True to delete only the files produced by the compiler but not
299 -- the library files or the executable files.
301 Config_File : Boolean := True;
303 -- Set to False to inhibit reading and processing of gnat.adc file
305 Config_File_Names : String_List_Access := null;
307 -- Names of configuration pragmas files (given by switches -gnatec)
309 Configurable_Run_Time_Mode : Boolean := False;
311 -- Set True if the compiler is operating in configurable run-time mode.
312 -- This happens if the flag Targparm.Configurable_Run_TimeMode_On_Target
313 -- is set True, or if pragma No_Run_Time is used. See the spec of Rtsfind
314 -- for details on the handling of the latter pragma.
316 Constant_Condition_Warnings : Boolean := False;
318 -- Set to True to activate warnings on constant conditions
320 Create_Mapping_File : Boolean := False;
322 -- Set to True (-C switch) to indicate that the compiler will be invoked
323 -- with a mapping file (-gnatem compiler switch).
325 Debug_Pragmas_Enabled : Boolean := False;
327 -- Enable debug statements from pragma Debug
329 subtype Debug_Level_Value is Nat range 0 .. 3;
330 Debugger_Level : Debug_Level_Value := 0;
332 -- The value given to the -g parameter. The default value for -g with
333 -- no value is 2. This is usually ignored by GNATBIND, except in the
334 -- VMS version where it is passed as an argument to __gnat_initialize
335 -- to trigger the activation of the remote debugging interface.
336 -- Is this still true ???
338 Debug_Generated_Code : Boolean := False;
340 -- Set True (-gnatD switch) to debug generated expanded code instead
341 -- of the original source code. Causes debugging information to be
342 -- written with respect to the generated code file that is written.
344 Default_Exit_Status : Int := 0;
346 -- Set the default exit status value. Set by the -Xnnn switch for the
349 Default_Stack_Size : Int := -1;
351 -- Set to default primary stack size in units of bytes. Set by
352 -- the -dnnn switch for the binder. A value of -1 indicates that no
353 -- default was set by the binder.
355 Default_Sec_Stack_Size : Int := -1;
357 -- Set to default secondary stack size in units of bytes. Set by
358 -- the -Dnnn switch for the binder. A value of -1 indicates that no
359 -- default was set by the binder, and that the default should be the
360 -- initial value of System.Secondary_Stack.Default_Secondary_Stack_Size.
362 Default_Pool : Node_Id := Empty;
364 -- Used to record the storage pool name (or null literal) that is the
365 -- argument of an applicable pragma Default_Storage_Pool.
366 -- Empty: No pragma Default_Storage_Pool applies.
367 -- N_Null node: "pragma Default_Storage_Pool (null);" applies.
368 -- otherwise: "pragma Default_Storage_Pool (X);" applies, and
369 -- this points to the name X.
370 -- Push_Scope and Pop_Scope in Sem_Ch8 save and restore this.
372 Detect_Blocking : Boolean := False;
374 -- Set True to force the run time to raise Program_Error if calls to
375 -- potentially blocking operations are detected from protected actions.
377 Display_Compilation_Progress : Boolean := False;
378 -- GNATMAKE, GPRMAKE, GPRBUILD
379 -- Set True (-d switch) to display information on progress while compiling
380 -- files. Internal flag to be used in conjunction with an IDE (e.g GPS).
382 type Distribution_Stub_Mode_Type is
385 -- Normal mode, no generation/compilation of distribution stubs
387 Generate_Receiver_Stub_Body,
388 -- The unit being compiled is the RCI body, and the compiler will
389 -- generate the body for the receiver stubs and compile it.
391 Generate_Caller_Stub_Body);
392 -- The unit being compiled is the RCI spec, and the compiler will
393 -- generate the body for the caller stubs and compile it.
395 Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;
397 -- This enumeration variable indicates the five states of distribution
398 -- annex stub generation/compilation.
400 Do_Not_Execute : Boolean := False;
402 -- Set to True if no actual compilations should be undertaken.
404 Dump_Source_Text : Boolean := False;
406 -- Set to True (by -gnatL) to dump source text intermingled with generated
407 -- code. Effective only if either of Debug/Print_Generated_Code is true.
409 Dynamic_Elaboration_Checks : Boolean := False;
411 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
412 -- switch or by the use of pragma Elaboration_Checks (Dynamic).
414 Dynamic_Stack_Measurement : Boolean := False;
416 -- Set True to enable dynamic stack measurement (-u flag for gnatbind)
418 Dynamic_Stack_Measurement_Array_Size : Nat := 100;
420 -- Number of measurements we want to store during dynamic stack analysis.
421 -- When the buffer is full, non-storable results will be output on the fly.
422 -- The value is relevant only if Dynamic_Stack_Measurement is set. Set
423 -- by processing of -u flag for gnatbind.
425 Elab_Dependency_Output : Boolean := False;
427 -- Set to True to output complete list of elaboration constraints
429 Elab_Order_Output : Boolean := False;
431 -- Set to True to output chosen elaboration order
433 Elab_Warnings : Boolean := False;
435 -- Set to True to generate full elaboration warnings (-gnatwl)
437 Enable_Overflow_Checks : Boolean := False;
439 -- Set to True if -gnato (enable overflow checks) switch is set,
442 Error_Msg_Line_Length : Nat := 0;
444 -- Records the error message line length limit. If this is set to zero,
445 -- then we get the old style behavior, in which each call to the error
446 -- message routines generates one line of output as a separate message.
447 -- If it is set to a non-zero value, then continuation lines are folded
448 -- to make a single long message, and then this message is split up into
449 -- multiple lines not exceeding the specified length. Set by -gnatj=nn.
451 Exception_Handler_Encountered : Boolean := False;
453 -- This flag is set true if the parser encounters an exception handler.
454 -- It is used to set Warn_On_Exception_Propagation True if the restriction
455 -- No_Exception_Propagation is set.
457 Exception_Locations_Suppressed : Boolean := False;
459 -- This flag is set True if a Suppress_Exception_Locations configuration
460 -- pragma is currently active.
462 type Exception_Mechanism_Type is
463 -- Determines the handling of exceptions. See Exp_Ch11 for details
465 (Front_End_Setjmp_Longjmp_Exceptions,
466 -- Exceptions use setjmp/longjmp generated explicitly by the
467 -- front end (this includes gigi or other equivalent parts of
468 -- the code generator). AT END handlers are converted into
469 -- exception handlers by the front end in this mode.
471 Back_End_Exceptions);
472 -- Exceptions are handled by the back end. The front end simply
473 -- generates the handlers as they appear in the source, and AT
474 -- END handlers are left untouched (they are not converted into
475 -- exception handlers when operating in this mode.
476 pragma Convention (C, Exception_Mechanism_Type);
478 Exception_Mechanism : Exception_Mechanism_Type :=
479 Front_End_Setjmp_Longjmp_Exceptions;
481 -- Set to the appropriate value depending on the default as given in
482 -- system.ads (ZCX_By_Default, GCC_ZCX_Support). The C convention is there
483 -- to make this variable accessible to gigi.
485 Exception_Tracebacks : Boolean := False;
487 -- Set to True to store tracebacks in exception occurrences (-E)
489 Extensions_Allowed : Boolean := False;
491 -- Set to True by switch -gnatX if GNAT specific language extensions
492 -- are allowed. For example, the use of 'Constrained with objects of
493 -- generic types is a GNAT extension.
495 type External_Casing_Type is (
496 As_Is, -- External names cased as they appear in the Ada source
497 Uppercase, -- External names forced to all uppercase letters
498 Lowercase); -- External names forced to all lowercase letters
500 External_Name_Imp_Casing : External_Casing_Type := Lowercase;
502 -- The setting of this flag determines the casing of external names
503 -- when the name is implicitly derived from an entity name (i.e. either
504 -- no explicit External_Name or Link_Name argument is used, or, in the
505 -- case of extended DEC pragmas, the external name is given using an
506 -- identifier. The As_Is setting is not permitted here (since this would
507 -- create Ada source programs that were case sensitive).
509 External_Name_Exp_Casing : External_Casing_Type := As_Is;
511 -- The setting of this flag determines the casing of an external name
512 -- specified explicitly with a string literal. As_Is means the string
513 -- literal is used as given with no modification to the casing. If
514 -- Lowercase or Uppercase is set, then the string is forced to all
515 -- lowercase or all uppercase letters as appropriate. Note that this
516 -- setting has no effect if the external name is given using an identifier
517 -- in the case of extended DEC import/export pragmas (in this case the
518 -- casing is controlled by External_Name_Imp_Casing), and also has no
519 -- effect if an explicit Link_Name is supplied (a link name is always
520 -- used exactly as given).
522 External_Unit_Compilation_Allowed : Boolean := False;
524 -- When True (set by gnatmake switch -x), allow compilation of sources
525 -- that are not part of any project file.
527 Fast_Math : Boolean := False;
529 -- Indicates the current setting of Fast_Math mode, as set by the use
530 -- of a Fast_Math pragma (set on by Fast_Math (On)).
532 Float_Format : Character := ' ';
534 -- A non-blank value indicates that a Float_Format pragma has been
535 -- processed, in which case this variable is set to 'I' for IEEE or
536 -- to 'V' for VAX. The setting of 'V' is only possible on OpenVMS
539 Float_Format_Long : Character := ' ';
541 -- A non-blank value indicates that a Long_Float pragma has been
542 -- processed (this pragma is recognized only in OpenVMS versions
543 -- of GNAT), in which case this variable is set to D or G for
544 -- D_Float or G_Float.
546 Force_ALI_Tree_File : Boolean := False;
548 -- Force generation of ALI file even if errors are encountered.
549 -- Also forces generation of tree file if -gnatt is also set.
551 Force_Checking_Of_Elaboration_Flags : Boolean := False;
553 -- True if binding with forced checking of the elaboration flags
556 Force_Compilations : Boolean := False;
557 -- GNATMAKE, GPRMAKE, GPRBUILD
558 -- Set to force recompilations even when the objects are up-to-date.
560 Full_Path_Name_For_Brief_Errors : Boolean := False;
562 -- When True, in Brief_Output mode, each error message line
563 -- will start with the full path name of the source.
564 -- When False, only the file name without directory information
567 Full_List : Boolean := False;
569 -- Set True to generate full source listing with embedded errors
571 Full_List_File_Name : String_Ptr := null;
573 -- Set to file name to generate full source listing to named file (or if
574 -- the name is of the form .xxx, then to name.xxx where name is the source
575 -- file name with extension stripped.
577 Generate_Processed_File : Boolean := False;
579 -- True when switch -gnateG is used. When True, create in a file
580 -- <source>.prep, if the source is preprocessed.
582 Generate_SCO : Boolean := False;
584 -- True when switch -gnateS is used. When True, Source Coverage Obligation
585 -- (SCO) information is generated and output in the ALI file. See unit
586 -- Par_SCO for full details.
588 Generating_Code : Boolean := False;
590 -- True if the frontend finished its work and has called the backend to
591 -- process the tree and generate the object file.
593 Global_Discard_Names : Boolean := False;
595 -- True if a pragma Discard_Names appeared as a configuration pragma for
596 -- the current compilation unit.
598 GNAT_Mode : Boolean := False;
600 -- True if compiling in GNAT system mode (-gnatg switch)
602 Heap_Size : Nat := 0;
604 -- Heap size for memory allocations. Valid values are 32 and 64. Only
607 HLO_Active : Boolean := False;
609 -- True if High Level Optimizer is activated (-gnatH switch)
611 Identifier_Character_Set : Character;
613 -- This variable indicates the character set to be used for identifiers.
614 -- The possible settings are:
615 -- '1' Latin-5 (ISO-8859-1)
616 -- '2' Latin-5 (ISO-8859-2)
617 -- '3' Latin-5 (ISO-8859-3)
618 -- '4' Latin-5 (ISO-8859-4)
619 -- '5' Latin-5 (ISO-8859-5, Cyrillic)
620 -- '9' Latin-5 (ISO-8859-9)
621 -- 'p' PC (US, IBM page 437)
622 -- '8' PC (European, IBM page 850)
623 -- 'f' Full upper set (all distinct)
624 -- 'n' No upper characters (Ada 83 rules)
625 -- 'w' Latin-1 plus wide characters allowed in identifiers
627 -- The setting affects the set of letters allowed in identifiers and the
628 -- upper/lower case equivalences. It does not affect the interpretation of
629 -- character and string literals, which are always stored using the actual
630 -- coding in the source program. This variable is initialized to the
631 -- default value appropriate to the system (in Osint.Initialize), and then
632 -- reset if a command line switch is used to change the setting.
634 Ignore_Rep_Clauses : Boolean := False;
636 -- Set True to ignore all representation clauses. Useful when compiling
637 -- code from foreign compilers for checking or ASIS purposes. Can be
638 -- set True by use of -gnatI.
640 Implementation_Unit_Warnings : Boolean := True;
642 -- Set True to active warnings for use of implementation internal units.
643 -- Can be controlled by use of -gnatwi/-gnatwI.
645 Implicit_Packing : Boolean := False;
647 -- If set True, then a Size attribute clause on an array is allowed to
648 -- cause implicit packing instead of generating an error message. Set by
649 -- use of pragma Implicit_Packing.
651 Ineffective_Inline_Warnings : Boolean := False;
653 -- Set True to activate warnings if front-end inlining (-gnatN) is not
654 -- able to actually inline a particular call (or all calls). Can be
655 -- controlled by use of -gnatwp/-gnatwP.
657 Init_Or_Norm_Scalars : Boolean := False;
659 -- Set True if a pragma Initialize_Scalars applies to the current unit.
660 -- Also set True if a pragma Normalize_Scalars applies.
662 Initialize_Scalars : Boolean := False;
664 -- Set True if a pragma Initialize_Scalars applies to the current unit.
665 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
667 Initialize_Scalars_Mode1 : Character := 'I';
668 Initialize_Scalars_Mode2 : Character := 'N';
670 -- Set to two characters from -S switch (IN/LO/HI/EV/xx). The default
671 -- is IN (invalid values), used if no -S switch is used.
673 Inline_Active : Boolean := False;
675 -- Set True to activate pragma Inline processing across modules. Default
676 -- for now is not to inline across module boundaries.
678 Interface_Library_Unit : Boolean := False;
680 -- Set to True to indicate that at least one ALI file is an interface ALI:
681 -- then elaboration flag checks are to be generated in the binder
684 Generate_SCIL : Boolean := False;
686 -- Set True to activate SCIL code generation.
688 Invalid_Value_Used : Boolean := False;
690 -- Set True if a valid Invalid_Value attribute is encountered
692 Follow_Links_For_Files : Boolean := False;
694 -- Set to True (-eL) to process the project files in trusted mode. If
695 -- Follow_Links is False, it is assumed that the project doesn't contain
696 -- any file duplicated through symbolic links (although the latter are
697 -- still valid if they point to a file which is outside of the project),
698 -- and that no directory has a name which is a valid source name.
700 Follow_Links_For_Dirs : Boolean := False;
702 -- Set to True if directories can be links in this project, and therefore
703 -- additional system calls must be performed to ensure that we always see
704 -- the same full name for each directory.
706 Front_End_Inlining : Boolean := False;
708 -- Set True to activate inlining by front-end expansion
710 Inline_Processing_Required : Boolean := False;
712 -- Set True if inline processing is required. Inline processing is required
713 -- if an active Inline pragma is processed. The flag is set for a pragma
714 -- Inline or Inline_Always that is actually active.
716 In_Place_Mode : Boolean := False;
718 -- Set True to store ALI and object files in place i.e. in the object
719 -- directory if these files already exist or in the source directory
722 Keep_Going : Boolean := False;
723 -- GNATMAKE, GPRMAKE, GPRBUILD
724 -- When True signals to ignore compilation errors and keep processing
725 -- sources until there is no more work.
727 Keep_Temporary_Files : Boolean := False;
729 -- When True the temporary files created by the GNAT driver are not
730 -- deleted. Set by switch -dn or qualifier /KEEP_TEMPORARY_FILES.
732 Leap_Seconds_Support : Boolean := False;
734 -- Set to True to enable leap seconds support in Ada.Calendar and its
737 Link_Only : Boolean := False;
738 -- GNATMAKE, GPRMAKE, GPRBUILD
739 -- Set to True to skip compile and bind steps (except when Bind_Only is
742 List_Inherited_Pre_Post : Boolean := True;
744 -- List inherited preconditions and postconditions from Pre'Class and
745 -- Post'Class aspects for ancestor subprograms.
747 List_Restrictions : Boolean := False;
749 -- Set to True to list restrictions pragmas that could apply to partition
751 List_Units : Boolean := False;
753 -- List units in the active library for a compilation (-gnatu switch)
755 List_Closure : Boolean := False;
757 -- List all sources in the closure of a main (-R gnatbind switch)
759 List_Dependencies : Boolean := False;
761 -- When True gnatmake verifies that the objects are up to date and
762 -- outputs the list of object dependencies (-M switch).
763 -- Output depends if -a switch is used or not.
764 -- This list can be used directly in a Makefile.
766 List_Representation_Info : Int range 0 .. 3 := 0;
768 -- Set non-zero by -gnatR switch to list representation information.
769 -- The settings are as follows:
771 -- 0 = no listing of representation information (default as above)
772 -- 1 = list rep info for user defined record and array types
773 -- 2 = list rep info for all user defined types and objects
774 -- 3 = like 2, but variable fields are decoded symbolically
776 List_Representation_Info_To_File : Boolean := False;
778 -- Set true by -gnatRs switch. Causes information from -gnatR/1/2/3 to be
779 -- written to file.rep (where file is the name of the source file) instead
780 -- of stdout. For example, if file x.adb is compiled using -gnatR2s then
781 -- representation info is written to x.adb.ref.
783 List_Representation_Info_Mechanisms : Boolean := False;
785 -- Set true by -gnatRm switch. Causes information on mechanisms to be
786 -- included in the representation output information.
788 List_Preprocessing_Symbols : Boolean := False;
790 -- Set to True if symbols for preprocessing a source are to be listed
791 -- before preprocessing occurs. Set to True by switch -s of gnatprep or
792 -- -s in preprocessing data file for the compiler.
794 type Create_Repinfo_File_Proc is access procedure (Src : String);
795 type Write_Repinfo_Line_Proc is access procedure (Info : String);
796 type Close_Repinfo_File_Proc is access procedure;
797 -- Types used for procedure addresses below
799 Create_Repinfo_File_Access : Create_Repinfo_File_Proc := null;
800 Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;
801 Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;
803 -- These three locations are left null when operating in non-compiler (e.g.
804 -- ASIS mode), but when operating in compiler mode, they are set to point
805 -- to the three corresponding procedures in Osint-C. The reason for this
806 -- slightly strange interface is to stop Repinfo from dragging in Osint in
807 -- ASIS mode, which would include lots of unwanted units in the ASIS build.
809 type Create_List_File_Proc is access procedure (S : String);
810 type Write_List_Info_Proc is access procedure (S : String);
811 type Close_List_File_Proc is access procedure;
812 -- Types used for procedure addresses below
814 Create_List_File_Access : Create_List_File_Proc := null;
815 Write_List_Info_Access : Write_List_Info_Proc := null;
816 Close_List_File_Access : Close_List_File_Proc := null;
818 -- These three locations are left null when operating in non-compiler
819 -- (e.g. from the binder), but when operating in compiler mode, they are
820 -- set to point to the three corresponding procedures in Osint-C. The
821 -- reason for this slightly strange interface is to prevent Repinfo
822 -- from dragging in Osint-C in the binder, which would include unwanted
823 -- units in the binder.
825 Locking_Policy : Character := ' ';
827 -- Set to ' ' for the default case (no locking policy specified). Reset to
828 -- first character (uppercase) of locking policy name if a valid pragma
829 -- Locking_Policy is encountered.
831 Locking_Policy_Sloc : Source_Ptr := No_Location;
833 -- Remember location of previous Locking_Policy pragma. This is used for
834 -- inconsistency error messages. A value of System_Location is used if the
835 -- policy is set in package System.
837 Look_In_Primary_Dir : Boolean := True;
838 -- GNAT, GNATBIND, GNATMAKE, GNATCLEAN
839 -- Set to False if a -I- was present on the command line. When True we are
840 -- allowed to look in the primary directory to locate other source or
843 Make_Steps : Boolean := False;
845 -- Set to True when either Compile_Only, Bind_Only or Link_Only is
848 Main_Index : Int := 0;
850 -- This is set to non-zero by gnatmake switch -eInnn to indicate that
851 -- the main program is the nnn unit in a multi-unit source file.
853 Mapping_File_Name : String_Ptr := null;
855 -- File name of mapping between unit names, file names and path names.
856 -- (given by switch -gnatem)
858 Maximum_Messages : Int := 9999;
860 -- Maximum default number of errors before compilation is terminated, or in
861 -- the case of GNAT, maximum number of warnings before further warnings are
862 -- suppressed. Can be overridden by -gnatm (GNAT) or -m (GNATBIND) switch.
864 Maximum_File_Name_Length : Int;
866 -- Maximum number of characters allowed in a file name, not counting the
867 -- extension, as set by the appropriate switch. If no switch is given,
868 -- then this value is initialized by Osint to the appropriate value.
870 Maximum_Processes : Positive := 1;
871 -- GNATMAKE, GPRMAKE, GPRBUILD
872 -- Maximum number of processes that should be spawned to carry out
875 Minimal_Recompilation : Boolean := False;
877 -- Set to True if minimal recompilation mode requested
879 Special_Exception_Package_Used : Boolean := False;
881 -- Set to True if either of the unit GNAT.Most_Recent_Exception or
882 -- GNAT.Exception_Traces is with'ed. Used to inhibit transformation of
883 -- local raise statements into gotos in the presence of either package.
885 Multiple_Unit_Index : Int;
887 -- This is set non-zero if the current unit is being compiled in multiple
888 -- unit per file mode, meaning that the current unit is selected from the
889 -- sequence of units in the current source file, using the value stored
890 -- in this variable (e.g. 2 = select second unit in file). A value of
891 -- zero indicates that we are in normal (one unit per file) mode.
893 No_Main_Subprogram : Boolean := False;
894 -- GNATMAKE, GNATBIND
895 -- Set to True if compilation/binding of a program without main
896 -- subprogram requested.
898 No_Run_Time_Mode : Boolean := False;
900 -- This flag is set True if a No_Run_Time pragma is encountered. See
901 -- spec of Rtsfind for a full description of handling of this pragma.
903 No_Split_Units : Boolean := False;
905 -- Set to True with switch --no-split-units. When True, unit sources, spec,
906 -- body and subunits, must all be in the same project.This is checked after
909 No_Stdinc : Boolean := False;
910 -- GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF
911 -- Set to True if no default source search dirs added to search list
913 No_Stdlib : Boolean := False;
914 -- GNATMAKE, GNATBIND, GNATFIND, GNATXREF
915 -- Set to True if no default library search dirs added to search list
917 No_Strict_Aliasing : Boolean := False;
919 -- Set True if pragma No_Strict_Aliasing with no parameters encountered
921 Normalize_Scalars : Boolean := False;
923 -- Set True if a pragma Normalize_Scalars applies to the current unit.
924 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
926 Object_Directory_Present : Boolean := False;
928 -- Set to True when an object directory is specified with option -D
930 One_Compilation_Per_Obj_Dir : Boolean := False;
931 -- GNATMAKE, GPRBUILD
932 -- Set to True with switch --single-compile-per-obj-dir. When True, there
933 -- cannot be simultaneous compilations with the object files in the same
934 -- object directory, if project files are used.
936 type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);
937 Operating_Mode : Operating_Mode_Type := Generate_Code;
939 -- Indicates the operating mode of the compiler. The default is generate
940 -- code, which runs the parser, semantics and backend. Switches can be
941 -- used to set syntax checking only mode, or syntax and semantics checking
942 -- only mode. Operating_Mode can also be modified as a result of detecting
943 -- errors during the compilation process. In particular if any serious
944 -- error is detected then this flag is reset from Generate_Code to
945 -- Check_Semantics after generating an error message.
947 Optimize_Alignment : Character := 'O';
948 -- Setting of Optimize_Alignment, set to T/S/O for time/space/off. Can
949 -- be modified by use of pragma Optimize_Alignment.
951 Optimize_Alignment_Local : Boolean := False;
952 -- Set True if Optimize_Alignment mode is set by a local configuration
953 -- pragma that overrides the gnat.adc (or other configuration file) default
954 -- so that the unit is not dependent on the default setting. Also always
955 -- set True for internal units, since these always have a default setting
956 -- of Optimize_Alignment (Off) that is enforced (essentially equivalent to
957 -- them all having such an explicit pragma in each unit).
959 Original_Operating_Mode : Operating_Mode_Type := Generate_Code;
961 -- Indicates the original operating mode of the compiler as set by compiler
962 -- options. This is identical to Operating_Mode except that this is not
963 -- affected by errors.
965 Optimization_Level : Int;
966 pragma Import (C, Optimization_Level, "optimize");
967 -- Constant reflecting the optimization level (0,1,2,3 for -O0,-O1,-O2,-O3)
968 -- See jmissing.c and aamissing.c for definitions for dotnet/jgnat and
972 pragma Import (C, Optimize_Size, "optimize_size");
973 -- Constant reflecting setting of -Os (optimize for size). Set to nonzero
974 -- in -Os mode and set to zero otherwise. See jmissing.c and aamissing.c
975 -- for definitions of "optimize_size" for dotnet/jgnat and GNAAMP backends
977 Output_File_Name_Present : Boolean := False;
978 -- GNATBIND, GNAT, GNATMAKE, GPRMAKE
979 -- Set to True when the output C file name is given with option -o for
980 -- GNATBIND, when the object file name is given with option -gnatO for GNAT
981 -- or when the executable is given with option -o for GNATMAKE or GPRMAKE.
983 Output_Linker_Option_List : Boolean := False;
985 -- True if output of list of linker options is requested (-K switch set)
987 Output_ALI_List : Boolean := False;
988 ALI_List_Filename : String_Ptr;
990 -- True if output of list of ALIs is requested (-A switch set). List is
991 -- output under the given filename, or standard output if not specified.
993 Output_Object_List : Boolean := False;
994 Object_List_Filename : String_Ptr;
996 -- True if output of list of objects is requested (-O switch set). List is
997 -- output under the given filename, or standard output if not specified.
999 Overflow_Checks_Unsuppressed : Boolean := False;
1001 -- Set to True if at least one occurrence of pragma Unsuppress
1002 -- (All_Checks|Overflow_Checks) has been processed.
1004 Persistent_BSS_Mode : Boolean := False;
1006 -- True if a Persistent_BSS configuration pragma is in effect, causing
1007 -- potentially persistent data to be placed in the persistent_bss section.
1009 Pessimistic_Elab_Order : Boolean := False;
1011 -- True if pessimistic elaboration order is to be chosen (-p switch set)
1013 Polling_Required : Boolean := False;
1015 -- Set to True if polling for asynchronous abort is enabled by using
1016 -- the -gnatP option for GNAT.
1018 Preprocessing_Data_File : String_Ptr := null;
1020 -- Set by switch -gnatep=. The file name of the preprocessing data file.
1022 Print_Generated_Code : Boolean := False;
1024 -- Set to True to enable output of generated code in source form. This
1025 -- flag is set by the -gnatG switch.
1027 Print_Standard : Boolean := False;
1029 -- Set to true to enable printing of package standard in source form.
1030 -- This flag is set by the -gnatS switch
1032 Propagate_Exceptions : Boolean := False;
1034 -- Indicates if subprogram descriptor exception tables should be
1035 -- built for imported subprograms. Set True if a Propagate_Exceptions
1036 -- pragma applies to the extended main unit.
1038 type Usage is (Unknown, Not_In_Use, In_Use);
1039 Project_File_In_Use : Usage := Unknown;
1041 -- Indicates if a project file is used or not. Set to In_Use by the first
1044 Queuing_Policy : Character := ' ';
1046 -- Set to ' ' for the default case (no queuing policy specified). Reset to
1047 -- first character (uppercase) of locking policy name if a valid
1048 -- Queuing_Policy pragma is encountered.
1050 Queuing_Policy_Sloc : Source_Ptr := No_Location;
1052 -- Remember location of previous Queuing_Policy pragma. This is used for
1053 -- inconsistency error messages. A value of System_Location is used if the
1054 -- policy is set in package System.
1056 Quiet_Output : Boolean := False;
1057 -- GNATMAKE, GNATCLEAN, GPRMAKE, GPRBUILD, GPRCLEAN
1058 -- Set to True if the tool should not have any output if there are no
1059 -- errors or warnings.
1061 Replace_In_Comments : Boolean := False;
1063 -- Set to True if -C switch used
1065 RTS_Lib_Path_Name : String_Ptr := null;
1066 RTS_Src_Path_Name : String_Ptr := null;
1068 -- Set to the "adalib" and "adainclude" directories of the run time
1069 -- specified by --RTS=.
1071 RTS_Switch : Boolean := False;
1072 -- GNAT, GNATMAKE, GNATBIND, GNATLS, GNATFIND, GNATXREF
1073 -- Set to True when the --RTS switch is set
1075 Run_Path_Option : Boolean := True;
1076 -- GNATMAKE, GNATLINK
1077 -- Set to False when no run_path_option should be issued to the linker
1079 Search_Directory_Present : Boolean := False;
1081 -- Set to True when argument is -I. Reset to False when next argument, a
1082 -- search directory path is taken into account. Note that this is quite
1083 -- different from other switches in this section in that it is only set in
1084 -- a transitory manner as a result of scanning a -I switch with no file
1085 -- name, and if set, is an indication that the next argument is to be
1086 -- treated as a file name.
1088 Sec_Stack_Used : Boolean := False;
1090 -- Set True if generated code uses the System.Secondary_Stack package. For
1091 -- the binder, set if any unit uses the secondary stack package.
1093 Setup_Projects : Boolean := False;
1095 -- Set to True for GNAT SETUP: the Project Manager creates non existing
1096 -- object, library and exec directories.
1098 Shared_Libgnat : Boolean;
1100 -- Set to True if a shared libgnat is requested by using the -shared option
1101 -- for GNATBIND and to False when using the -static option. The value of
1102 -- this flag is set by Gnatbind.Scan_Bind_Arg.
1104 Short_Circuit_And_Or : Boolean := False;
1106 -- Set True if a pragma Short_Circuit_And_Or applies to the current unit.
1108 Short_Descriptors : Boolean := False;
1110 -- Set True if a pragma Short_Descriptors applies to the current unit.
1112 Sprint_Line_Limit : Nat := 72;
1114 -- Limit values for chopping long lines in Sprint output, can be reset
1115 -- by use of NNN parameter with -gnatG or -gnatD switches.
1117 Stack_Checking_Enabled : Boolean;
1119 -- Set to indicate if -fstack-check switch is set for the compilation. True
1120 -- means that the switch is set, so that stack checking is enabled. False
1121 -- means that the switch is not set (no stack checking). This value is
1122 -- obtained from the external imported value flag_stack_check in the gcc
1123 -- backend (see Frontend) and may be referenced throughout the compilation
1126 Style_Check : Boolean := False;
1128 -- Set True to perform style checks. Activates checks carried out in
1129 -- package Style (see body of this package for details of checks) This
1130 -- flag is set True by either the -gnatg or -gnaty switches.
1132 Suppress_All_Inlining : Boolean := False;
1134 -- Set by -fno-inline. Suppresses all inlining, both front end and back end
1135 -- regardless of any other switches that are set.
1137 Suppress_Control_Flow_Optimizations : Boolean := False;
1139 -- Set by -fpreserve-control-flow. Suppresses control flow optimizations
1140 -- that interfere with coverage analysis based on the object code.
1142 System_Extend_Pragma_Arg : Node_Id := Empty;
1144 -- Set non-empty if and only if a correct Extend_System pragma was present
1145 -- in which case it points to the argument of the pragma, and the name can
1146 -- be located as Chars (Expression (System_Extend_Pragma_Arg)).
1148 System_Extend_Unit : Node_Id := Empty;
1150 -- This is set to Empty if GNAT_Mode is set, since pragma Extend_System
1151 -- is never appropriate in GNAT_Mode (and causes troubles, including
1152 -- bogus circularities, if we try to compile the run-time library with
1153 -- a System extension). If GNAT_Mode is not set, then System_Extend_Unit
1154 -- is a copy of the value set in System_Extend_Pragma_Arg.
1156 Subunits_Missing : Boolean := False;
1158 -- This flag is set true if missing subunits are detected with code
1159 -- generation active. This causes code generation to be skipped.
1161 Suppress_Checks : Boolean := False;
1163 -- Set to True if -gnatp (suppress all checks) switch present.
1165 Suppress_Options : Suppress_Array;
1167 -- Flags set True to suppress corresponding check, i.e. add an implicit
1168 -- pragma Suppress at the outer level of each unit compiled. Note that
1169 -- these suppress actions can be overridden by the use of the Unsuppress
1170 -- pragma. This variable is initialized by Osint.Initialize.
1172 Suppress_Back_Annotation : Boolean := False;
1174 -- This flag is set True if back annotation of representation information
1175 -- is to be suppressed. This is set if neither -gnatt or -gnatR0-3 is set.
1176 -- This avoids unnecessary time being spent on back annotation.
1178 Table_Factor : Int := 1;
1180 -- Factor by which all initial table sizes set in Alloc are multiplied.
1181 -- Used in Table to calculate initial table sizes (the initial table size
1182 -- is the value in Alloc, used as the Table_Initial parameter value,
1183 -- multiplied by the factor given here. The default value is used if no
1184 -- -gnatT switch appears.
1186 Tagged_Type_Expansion : Boolean := True;
1188 -- Set True if tagged types and interfaces should be expanded by the
1189 -- front-end. If False, the original tree is left unexpanded for tagged
1190 -- types and dispatching calls, assuming the underlying target supports
1191 -- it (e.g. in the JVM case).
1193 Task_Dispatching_Policy : Character := ' ';
1195 -- Set to ' ' for the default case (no task dispatching policy specified).
1196 -- Reset to first character (uppercase) of task dispatching policy name
1197 -- if a valid Task_Dispatching_Policy pragma is encountered.
1199 Task_Dispatching_Policy_Sloc : Source_Ptr := No_Location;
1201 -- Remember location of previous Task_Dispatching_Policy pragma. This is
1202 -- used for inconsistency error messages. A value of System_Location is
1203 -- used if the policy is set in package System.
1205 Tasking_Used : Boolean := False;
1206 -- Set True if any tasking construct is encountered. Used to activate the
1207 -- output of the Q, L and T lines in ALI files.
1209 Time_Slice_Set : Boolean := False;
1211 -- Set True if a pragma Time_Slice is processed in the main unit, or
1212 -- if the -gnatTnn switch is present to set a time slice value.
1214 Time_Slice_Value : Nat;
1216 -- Time slice value. Valid only if Time_Slice_Set is True, i.e. if
1217 -- Time_Slice pragma has been processed. Set to the time slice value in
1218 -- microseconds. Negative values are stored as zero, and the value is not
1219 -- larger than 1_000_000_000 (1000 seconds). Values larger than this are
1220 -- reset to this maximum. This can also be set with the -gnatTnn switch.
1222 Tolerate_Consistency_Errors : Boolean := False;
1224 -- Tolerate time stamp and other consistency errors. If this flag is set to
1225 -- True (-t), then inconsistencies result in warnings rather than errors.
1227 Treat_Restrictions_As_Warnings : Boolean := False;
1229 -- Set True to treat pragma Restrictions as Restriction_Warnings. Set by
1232 Tree_Output : Boolean := False;
1234 -- Set to True (-gnatt) to generate output tree file
1236 True_VMS_Target : Boolean := False;
1237 -- Set True if we are on a VMS target. The setting of this flag reflects
1238 -- the true state of the compile, unlike Targparm.OpenVMS_On_Target which
1239 -- can also be true when debug flag m is set (-gnatdm). This is used in the
1240 -- few cases where we do NOT want -gnatdm to trigger the VMS behavior.
1242 Try_Semantics : Boolean := False;
1244 -- Flag set to force attempt at semantic analysis, even if parser errors
1245 -- occur. This will probably cause blowups at this stage in the game. On
1246 -- the other hand, most such blowups will be caught cleanly and simply
1247 -- say compilation abandoned. This flag is set to True by -gnatq or -gnatQ.
1249 Unchecked_Shared_Lib_Imports : Boolean := False;
1251 -- Set to True when shared library projects are allowed to import projects
1252 -- that are not shared library projects. Set by switch
1253 -- --unchecked-shared-lib-imports.
1255 Undefined_Symbols_Are_False : Boolean := False;
1257 -- Set to True by switch -u of gnatprep or -u in the preprocessing data
1258 -- file for the compiler. Indicates that while preprocessing sources,
1259 -- symbols that are not defined have the value FALSE.
1261 Unique_Error_Tag : Boolean := Tag_Errors;
1263 -- Indicates if error messages are to be prefixed by the string error:
1264 -- Initialized from Tag_Errors, can be forced on with the -gnatU switch.
1266 Universal_Addressing_On_AAMP : Boolean := False;
1268 -- Indicates if library-level objects should be accessed and updated using
1269 -- universal addressing instructions on the AAMP architecture. This flag is
1270 -- set to True when pragma Universal_Data is given as a configuration
1273 Unreserve_All_Interrupts : Boolean := False;
1275 -- Normally set False, set True if a valid Unreserve_All_Interrupts pragma
1276 -- appears anywhere in the main unit for GNAT, or if any ALI file has the
1277 -- corresponding attribute set in GNATBIND.
1279 Upper_Half_Encoding : Boolean := False;
1281 -- Normally set False, indicating that upper half ISO 8859-1 characters are
1282 -- used in the normal way to represent themselves. If the wide character
1283 -- encoding method uses the upper bit for this encoding, then this flag is
1284 -- set True, and upper half characters in the source indicate the start of
1285 -- a wide character sequence. Set by -gnatW or -W switches.
1287 Use_Include_Path_File : Boolean := False;
1288 -- GNATMAKE, GPRBUILD
1289 -- When True, create a source search path file, even when a mapping file
1292 Usage_Requested : Boolean := False;
1293 -- GNAT, GNATBIND, GNATMAKE
1294 -- Set to True if -h (-gnath for the compiler) switch encountered
1295 -- requesting usage information
1297 Use_Expression_With_Actions : Boolean;
1298 -- The N_Expression_With_Actions node has been introduced relatively
1299 -- recently, and not all back ends are prepared to handle it yet. So
1300 -- we use this flag to suppress its use during a transitional period.
1301 -- Currently the default is False for all cases (set in gnat1drv).
1302 -- The default can be modified using -gnatd.X/-gnatd.Y.
1304 Use_Pragma_Linker_Constructor : Boolean := False;
1306 -- True if pragma Linker_Constructor applies to adainit
1308 Use_VADS_Size : Boolean := False;
1310 -- Set to True if a valid pragma Use_VADS_Size is processed
1312 Validity_Checks_On : Boolean := True;
1314 -- This flag determines if validity checking is on or off. The initial
1315 -- state is on, and the required default validity checks are active. The
1316 -- actual set of checks that is performed if Validity_Checks_On is set is
1317 -- defined by the switches in package Validsw. The Validity_Checks_On flag
1318 -- is controlled by pragma Validity_Checks (On | Off), and also some
1319 -- generated compiler code (typically code that has to do with validity
1320 -- check generation) is compiled with this flag set to False. This flag is
1321 -- set to False by the -gnatp switch.
1323 Verbose_Mode : Boolean := False;
1324 -- GNAT, GNATBIND, GNATMAKE, GNATLINK, GNATLS, GNATNAME, GNATCLEAN,
1325 -- GPRMAKE, GPRBUILD, GPRCLEAN
1326 -- Set to True to get verbose mode (full error message text and location
1327 -- information sent to standard output, also header, copyright and summary)
1329 type Verbosity_Level_Type is (None, Low, Medium, High);
1330 pragma Ordered (Verbosity_Level_Type);
1331 Verbosity_Level : Verbosity_Level_Type := High;
1332 -- GNATMAKE, GPRMAKE
1333 -- Modified by gnatmake or gprmake switches -v, -vl, -vm, -vh. Indicates
1334 -- the level of verbosity of informational messages:
1336 -- In Low Verbosity, the reasons why a source is recompiled, the name
1337 -- of the executable and the reason it must be rebuilt is output.
1339 -- In Medium Verbosity, additional lines are output for each ALI file
1342 -- In High Verbosity, additional lines are output when the ALI file
1343 -- is part of an Ada library, is read-only or is part of the runtime.
1345 Warn_On_Ada_2005_Compatibility : Boolean := True;
1347 -- Set to True to generate all warnings on Ada 2005 compatibility issues,
1348 -- including warnings on Ada 2005 obsolescent features used in Ada 2005
1349 -- mode. Set False by -gnatwY.
1351 Warn_On_Ada_2012_Compatibility : Boolean := True;
1353 -- Set to True to generate all warnings on Ada 2012 compatibility issues,
1354 -- including warnings on Ada 2012 obsolescent features used in Ada 2012
1355 -- mode. Set False by -gnatwY.
1357 Warn_On_Parameter_Order : Boolean := False;
1359 -- Set to True to generate warnings for cases where the argument list for
1360 -- a call is a sequence of identifiers that match the formal identifiers,
1361 -- but are in the wrong order.
1363 Warn_On_Assertion_Failure : Boolean := True;
1365 -- Set to True to activate warnings on assertions that can be determined
1366 -- at compile time will always fail. Set false by -gnatw.A.
1368 Warn_On_Assumed_Low_Bound : Boolean := True;
1370 -- Set to True to activate warnings for string parameters that are indexed
1371 -- with literals or S'Length, presumably assuming a lower bound of one. Set
1372 -- False by -gnatwW.
1374 Warn_On_Bad_Fixed_Value : Boolean := False;
1376 -- Set to True to generate warnings for static fixed-point expression
1377 -- values that are not an exact multiple of the small value of the type.
1379 Warn_On_Biased_Representation : Boolean := True;
1381 -- Set to True to generate warnings for size clauses, component clauses
1382 -- and component_size clauses that force biased representation. Set False
1385 Warn_On_Constant : Boolean := False;
1387 -- Set to True to generate warnings for variables that could be declared
1388 -- as constants. Modified by use of -gnatwk/K.
1390 Warn_On_Deleted_Code : Boolean := False;
1392 -- Set to True to generate warnings for code deleted by the front end
1393 -- for conditional statements whose outcome is known at compile time.
1394 -- Modified by use of -gnatwt/T.
1396 Warn_On_Dereference : Boolean := False;
1398 -- Set to True to generate warnings for implicit dereferences for array
1399 -- indexing and record component access. Modified by use of -gnatwd/D.
1401 Warn_On_Export_Import : Boolean := True;
1403 -- Set to True to generate warnings for suspicious use of export or
1404 -- import pragmas. Modified by use of -gnatwx/X.
1406 Warn_On_Hiding : Boolean := False;
1408 -- Set to True to generate warnings if a declared entity hides another
1409 -- entity. The default is that this warning is suppressed.
1411 Warn_On_Modified_Unread : Boolean := False;
1413 -- Set to True to generate warnings if a variable is assigned but is never
1414 -- read. Also controls warnings for similar cases involving out parameters,
1415 -- but only if there is only one out parameter for the procedure involved.
1416 -- The default is that this warning is suppressed.
1418 Warn_On_All_Unread_Out_Parameters : Boolean := False;
1420 -- Set to True to generate warnings in all cases where a variable is
1421 -- modified by being passed as to an OUT formal, but the resulting value is
1422 -- never read. The default is that this warning is suppressed, except in
1425 Warn_On_No_Value_Assigned : Boolean := True;
1427 -- Set to True to generate warnings if no value is ever assigned to a
1428 -- variable that is at least partially uninitialized. Set to false to
1429 -- suppress such warnings. The default is that such warnings are enabled.
1431 Warn_On_Non_Local_Exception : Boolean := False;
1433 -- Set to True to generate warnings for non-local exception raises and also
1434 -- handlers that can never handle a local raise. This warning is only ever
1435 -- generated if pragma Restrictions (No_Exception_Propagation) is set. The
1436 -- default is not to generate the warnings except that if the source has
1437 -- at least one exception handler, and this restriction is set, and the
1438 -- warning was not explicitly turned off, then it is turned on by default.
1440 No_Warn_On_Non_Local_Exception : Boolean := False;
1442 -- This is set to True if the above warning is explicitly suppressed. We
1443 -- use this to avoid turning it on by default when No_Exception_Propagation
1444 -- restriction is set and an exception handler is present.
1446 Warn_On_Obsolescent_Feature : Boolean := False;
1448 -- Set to True to generate warnings on use of any feature in Annex or if a
1449 -- subprogram is called for which a pragma Obsolescent applies.
1451 Warn_On_Overlap : Boolean := False;
1453 -- Set to True to generate warnings when a writable actual which is not
1454 -- a by-copy type overlaps with another actual in a subprogram call.
1456 Warn_On_Questionable_Missing_Parens : Boolean := True;
1458 -- Set to True to generate warnings for cases where parentheses are missing
1459 -- and the usage is questionable, because the intent is unclear.
1461 Warn_On_Redundant_Constructs : Boolean := False;
1463 -- Set to True to generate warnings for redundant constructs (e.g. useless
1464 -- assignments/conversions). The default is that this warning is disabled.
1466 Warn_On_Object_Renames_Function : Boolean := False;
1468 -- Set to True to generate warnings when a function result is renamed as
1469 -- an object. The default is that this warning is disabled.
1471 Warn_On_Reverse_Bit_Order : Boolean := True;
1473 -- Set to True to generate warning (informational) messages for component
1474 -- clauses that are affected by non-standard bit-order. The default is
1475 -- that this warning is enabled.
1477 Warn_On_Suspicious_Modulus_Value : Boolean := True;
1479 -- Set to True to generate warnings for suspicious modulus values. The
1480 -- default is that this warning is enabled.
1482 Warn_On_Unchecked_Conversion : Boolean := True;
1484 -- Set to True to generate warnings for unchecked conversions that may have
1485 -- non-portable semantics (e.g. because sizes of types differ). The default
1486 -- is that this warning is enabled.
1488 Warn_On_Unordered_Enumeration_Type : Boolean := False;
1490 -- Set to True to generate warnings for inappropriate uses (comparisons
1491 -- and explicit ranges) on unordered enumeration types (which includes
1492 -- all enumeration types for which pragma Ordered is not given). The
1493 -- default is that this warning is disabled.
1495 Warn_On_Unrecognized_Pragma : Boolean := True;
1497 -- Set to True to generate warnings for unrecognized pragmas. The default
1498 -- is that this warning is enabled.
1500 Warn_On_Unrepped_Components : Boolean := False;
1502 -- Set to True to generate warnings for the case of components of record
1503 -- which have a record representation clause but this component does not
1504 -- have a component clause. The default is that this warning is disabled.
1506 Warn_On_Warnings_Off : Boolean := False;
1508 -- Set to True to generate warnings for use of Pragma Warnings (Off, ent),
1509 -- where either the pragma is never used, or it could be replaced by a
1510 -- pragma Unmodified or Unreferenced.
1512 type Warning_Mode_Type is (Suppress, Normal, Treat_As_Error);
1513 Warning_Mode : Warning_Mode_Type := Normal;
1515 -- Controls treatment of warning messages. If set to Suppress, warning
1516 -- messages are not generated at all. In Normal mode, they are generated
1517 -- but do not count as errors. In Treat_As_Error mode, warning messages
1518 -- are generated and are treated as errors.
1520 Wide_Character_Encoding_Method : WC_Encoding_Method := WCEM_Brackets;
1522 -- Method used for encoding wide characters in the source program. See
1523 -- description of type in unit System.WCh_Con for a list of the methods
1524 -- that are currently supported. Note that brackets notation is always
1525 -- recognized in source programs regardless of the setting of this
1526 -- variable. The default setting causes only the brackets notation to be
1527 -- recognized. If this is the main unit, this setting also controls the
1528 -- output of the W=? parameter in the ALI file, which is used to provide
1529 -- the default for encoding [Wide_[Wide_]]Text_IO files. For the binder,
1530 -- the value set here overrides this main unit default.
1532 Wide_Character_Encoding_Method_Specified : Boolean := False;
1534 -- Set True if the value in Wide_Character_Encoding_Method was set as
1535 -- a result of an explicit -gnatW? or -W? switch. False otherwise.
1537 Xref_Active : Boolean := True;
1539 -- Set if cross-referencing is enabled (i.e. xref info in ALI files)
1541 Zero_Formatting : Boolean := False;
1543 -- Do no formatting (no title, no leading spaces, no empty lines) in
1544 -- auxiliary outputs (-e, -K, -l, -R).
1546 ----------------------------
1547 -- Configuration Settings --
1548 ----------------------------
1550 -- These are settings that are used to establish the mode at the start of
1551 -- each unit. The values defined below can be affected either by command
1552 -- line switches, or by the use of appropriate configuration pragmas in a
1553 -- configuration pragma file.
1555 Ada_Version_Config : Ada_Version_Type;
1557 -- This is the value of the configuration switch for the Ada 83 mode, as
1558 -- set by the command line switches -gnat83/95/05, and possibly modified by
1559 -- the use of configuration pragmas Ada_83/Ada95/Ada05. This switch is used
1560 -- to set the initial value for Ada_Version mode at the start of analysis
1561 -- of a unit. Note however, that the setting of this flag is ignored for
1562 -- internal and predefined units (which are always compiled in the most up
1563 -- to date version of Ada).
1565 Ada_Version_Explicit_Config : Ada_Version_Type;
1567 -- This is set in the same manner as Ada_Version_Config. The difference is
1568 -- that the setting of this flag is not ignored for internal and predefined
1569 -- units, which for some purposes do indeed access this value, regardless
1570 -- of the fact that they are compiled the most up to date ada version).
1572 Assertions_Enabled_Config : Boolean;
1574 -- This is the value of the configuration switch for assertions enabled
1575 -- mode, as possibly set by the command line switch -gnata, and possibly
1576 -- modified by the use of the configuration pragma Assertion_Policy.
1578 Assume_No_Invalid_Values_Config : Boolean;
1580 -- This is the value of the configuration switch for assuming "no invalid
1581 -- values enabled" mode, as possibly set by the command line switch
1582 -- -gnatB, and possibly modified by the use of the configuration pragma
1583 -- Assume_No_Invalid_Values.
1585 Check_Policy_List_Config : Node_Id;
1587 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
1588 -- that are linked through the Next_Pragma fields, with the list being
1589 -- terminated by Empty. The order is most recently processed first. This
1590 -- list includes only those pragmas in configuration pragma files.
1592 Debug_Pragmas_Enabled_Config : Boolean;
1594 -- This is the value of the configuration switch for debug pragmas enabled
1595 -- mode, as possibly set by the command line switch -gnata and possibly
1596 -- modified by the use of the configuration pragma Debug_Policy.
1598 Default_Pool_Config : Node_Id := Empty;
1600 -- Same as Default_Pool above, except this is only for Default_Storage_Pool
1601 -- pragmas that are configuration pragmas.
1603 Dynamic_Elaboration_Checks_Config : Boolean := False;
1605 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
1606 -- switch or by the use of pragma Elaboration_Checking (Dynamic).
1608 Exception_Locations_Suppressed_Config : Boolean := False;
1610 -- Set True by use of the configuration pragma Suppress_Exception_Messages
1612 Extensions_Allowed_Config : Boolean;
1614 -- This is the flag that indicates whether extensions are allowed. It can
1615 -- be set True either by use of the -gnatX switch, or by use of the
1616 -- configuration pragma Extensions_Allowed (On). It is always set to True
1617 -- for internal GNAT units, since extensions are always permitted in such
1620 External_Name_Exp_Casing_Config : External_Casing_Type;
1622 -- This is the value of the configuration switch that controls casing of
1623 -- external symbols for which an explicit external name is given. It can be
1624 -- set to Uppercase by the command line switch -gnatF, and further modified
1625 -- by the use of the configuration pragma External_Name_Casing in the
1626 -- gnat.adc file. This flag is used to set the initial value for
1627 -- External_Name_Exp_Casing at the start of analyzing each unit. Note
1628 -- however that the setting of this flag is ignored for internal and
1629 -- predefined units (which are always compiled with As_Is mode).
1631 External_Name_Imp_Casing_Config : External_Casing_Type;
1633 -- This is the value of the configuration switch that controls casing of
1634 -- external symbols where the external name is implicitly given. It can be
1635 -- set to Uppercase by the command line switch -gnatF, and further modified
1636 -- by the use of the configuration pragma External_Name_Casing in the
1637 -- gnat.adc file. This flag is used to set the initial value for
1638 -- External_Name_Imp_Casing at the start of analyzing each unit. Note
1639 -- however that the setting of this flag is ignored for internal and
1640 -- predefined units (which are always compiled with Lowercase mode).
1642 Fast_Math_Config : Boolean;
1644 -- This is the value of the configuration switch that controls Fast_Math
1645 -- mode, as set by a Fast_Math pragma in configuration pragmas. It is
1646 -- used to set the initial value of Fast_Math at the start of each new
1647 -- compilation unit.
1649 Init_Or_Norm_Scalars_Config : Boolean;
1651 -- This is the value of the configuration switch that is set by one
1652 -- of the pragmas Initialize_Scalars or Normalize_Scalars.
1654 Initialize_Scalars_Config : Boolean;
1656 -- This is the value of the configuration switch that is set by the
1657 -- pragma Initialize_Scalars when it appears in the gnat.adc file.
1658 -- This switch is not set when the pragma appears ahead of a given
1659 -- unit, so it does not affect the compilation of other units.
1661 Optimize_Alignment_Config : Character;
1663 -- This is the value of the configuration switch that controls the
1664 -- alignment optimization mode, as set by an Optimize_Alignment pragma.
1665 -- It is used to set the initial value of Optimize_Alignment at the start
1666 -- of each new compilation unit, except that it is always set to 'O' (off)
1667 -- for internal units.
1669 Persistent_BSS_Mode_Config : Boolean;
1671 -- This is the value of the configuration switch that controls whether
1672 -- potentially persistent data is to be placed in the persistent_bss
1673 -- section. It can be set True by use of the pragma Persistent_BSS.
1674 -- This flag is used to set the initial value of Persistent_BSS_Mode
1675 -- at the start of each compilation unit, except that it is always
1676 -- set False for predefined units.
1678 Polling_Required_Config : Boolean;
1680 -- This is the value of the configuration switch that controls polling
1681 -- mode. It can be set True by the command line switch -gnatP, and then
1682 -- further modified by the use of pragma Polling in the gnat.adc file. This
1683 -- flag is used to set the initial value for Polling_Required at the start
1684 -- of analyzing each unit.
1686 Short_Descriptors_Config : Boolean;
1688 -- This is the value of the configuration switch that controls the use of
1689 -- Short_Descriptors for setting descriptor default sizes. It can be set
1690 -- True by the use of the pragma Short_Descriptors in the gnat.adc file.
1691 -- This flag is used to set the initial value for Short_Descriptors at the
1692 -- start of analyzing each unit.
1694 Use_VADS_Size_Config : Boolean;
1696 -- This is the value of the configuration switch that controls the use of
1697 -- VADS_Size instead of Size wherever the attribute Size is used. It can
1698 -- be set True by the use of the pragma Use_VADS_Size in the gnat.adc file.
1699 -- This flag is used to set the initial value for Use_VADS_Size at the
1700 -- start of analyzing each unit. Note however that the setting of this flag
1701 -- is ignored for internal and predefined units (which are always compiled
1702 -- with the standard Size semantics).
1704 type Config_Switches_Type is private;
1705 -- Type used to save values of the switches set from Config values
1707 procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type);
1708 -- This procedure saves the current values of the switches which are
1709 -- initialized from the above Config values, and then resets these switches
1710 -- according to the Config value settings.
1712 procedure Set_Opt_Config_Switches
1713 (Internal_Unit : Boolean;
1714 Main_Unit : Boolean);
1715 -- This procedure sets the switches to the appropriate initial values. The
1716 -- parameter Internal_Unit is True for an internal or predefined unit, and
1717 -- affects the way the switches are set (see above). Main_Unit is true if
1718 -- switches are being set for the main unit (this affects setting of the
1719 -- assert/debug pragma switches, which are normally set false by default
1720 -- for an internal unit, except when the internal unit is the main unit,
1721 -- in which case we use the command line settings).
1723 procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type);
1724 -- This procedure restores a set of switch values previously saved by a
1725 -- call to Save_Opt_Switches.
1727 procedure Register_Opt_Config_Switches;
1728 -- This procedure is called after processing the gnat.adc file and other
1729 -- configuration pragma files to record the values of the Config switches,
1730 -- as possibly modified by the use of command line switches and pragmas
1731 -- appearing in these files.
1733 ------------------------
1734 -- Other Global Flags --
1735 ------------------------
1737 Expander_Active : Boolean := False;
1738 -- A flag that indicates if expansion is active (True) or deactivated
1739 -- (False). When expansion is deactivated all calls to expander routines
1740 -- have no effect. Note that the initial setting of False is merely to
1741 -- prevent saving of an undefined value for an initial call to the
1742 -- Expander_Mode_Save_And_Set procedure. For more information on the use of
1743 -- this flag, see package Expander. Indeed this flag might more logically
1744 -- be in the spec of Expander, but it is referenced by Errout, and it
1745 -- really seems wrong for Errout to depend on Expander.
1747 Static_Dispatch_Tables : Boolean := True;
1748 -- This flag indicates if the backend supports generation of statically
1749 -- allocated dispatch tables. If it is True, then the front end will
1750 -- generate static aggregates for dispatch tables that contain forward
1751 -- references to addresses of subprograms not seen yet, and the back end
1752 -- must be prepared to handle this case. If it is False, then the front
1753 -- end generates assignments to initialize the dispatch table, and there
1754 -- are no such forward references. By default we build statically allocated
1755 -- dispatch tables for all library level tagged types in all platforms.This
1756 -- behavior can be disabled using switch -gnatd.t which will set this flag
1757 -- to False and revert to the previous dynamic behavior.
1759 -----------------------
1760 -- Tree I/O Routines --
1761 -----------------------
1763 procedure Tree_Read;
1764 -- Reads switch settings from current tree file using Tree_Read
1766 procedure Tree_Write;
1767 -- Writes out switch settings to current tree file using Tree_Write
1769 --------------------------
1770 -- ASIS Version Control --
1771 --------------------------
1773 -- These two variables (Tree_Version_String and Tree_ASIS_Version_Number)
1774 -- are supposed to be used in the GNAT/ASIS version check performed in
1775 -- the ASIS code (this package is also a part of the ASIS implementation).
1776 -- They are set by Tree_Read procedure, so they represent the version
1777 -- number (and the version string) of the compiler which has created the
1778 -- tree, and they are supposed to be compared with the corresponding values
1779 -- from the Tree_IO and Gnatvsn packages which also are a part of ASIS
1782 Tree_Version_String : String_Access;
1783 -- Used to store the compiler version string read from a tree file to check
1784 -- if it is from the same date as stored in the version string in Gnatvsn.
1785 -- We require that ASIS Pro can be used only with GNAT Pro, but we allow
1786 -- non-Pro ASIS and ASIS-based tools to be used with any version of the
1787 -- GNAT compiler. Therefore, we need the possibility to compare the dates
1788 -- of the corresponding source sets, using version strings that may be
1789 -- of different lengths.
1791 Tree_ASIS_Version_Number : Int;
1792 -- Used to store the ASIS version number read from a tree file to check if
1793 -- it is the same as stored in the ASIS version number in Tree_IO.
1797 -- The following type is used to save and restore settings of switches in
1798 -- Opt that represent the configuration (i.e. result of config pragmas).
1800 -- Note that Ada_Version_Explicit is not included, since this is a sticky
1801 -- flag that once set does not get reset, since the whole idea of this flag
1802 -- is to record the setting for the main unit.
1804 type Config_Switches_Type is record
1805 Ada_Version : Ada_Version_Type;
1806 Ada_Version_Explicit : Ada_Version_Type;
1807 Assertions_Enabled : Boolean;
1808 Assume_No_Invalid_Values : Boolean;
1809 Check_Policy_List : Node_Id;
1810 Debug_Pragmas_Enabled : Boolean;
1811 Default_Pool : Node_Id;
1812 Dynamic_Elaboration_Checks : Boolean;
1813 Exception_Locations_Suppressed : Boolean;
1814 Extensions_Allowed : Boolean;
1815 External_Name_Exp_Casing : External_Casing_Type;
1816 External_Name_Imp_Casing : External_Casing_Type;
1817 Fast_Math : Boolean;
1818 Init_Or_Norm_Scalars : Boolean;
1819 Initialize_Scalars : Boolean;
1820 Optimize_Alignment : Character;
1821 Optimize_Alignment_Local : Boolean;
1822 Persistent_BSS_Mode : Boolean;
1823 Polling_Required : Boolean;
1824 Short_Descriptors : Boolean;
1825 Use_VADS_Size : Boolean;
1828 -- The following declarations are for GCC version dependent flags. We do
1829 -- not let client code in the compiler test GCC_Version directly, but
1830 -- instead use deferred constants for relevant feature tags.
1832 -- Note: there currently are no such constants defined in this section,
1833 -- since the compiler front end is currently entirely independent of the
1834 -- GCC version, which is a desirable state of affairs.
1836 function get_gcc_version return Int;
1837 pragma Import (C, get_gcc_version, "get_gcc_version");
1839 GCC_Version : constant Nat := get_gcc_version;
1841 -- Indicates which version of gcc is in use (3 = 3.x, 4 = 4.x). Note that
1842 -- gcc 2.8.1 (which used to be a value of 2) is no longer supported.
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