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1 /* Target definitions for Darwin (Mac OS X) systems.
2    Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
3    2005, 2006, 2007
4    Free Software Foundation, Inc.
5    Contributed by Apple Computer Inc.
6
7 This file is part of GCC.
8
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
12 any later version.
13
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING.  If not, write to
21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA.  */
23
24 #ifndef CONFIG_DARWIN_H
25 #define CONFIG_DARWIN_H
26
27 /* The definitions in this file are common to all processor types
28    running Darwin, which is the kernel for Mac OS X.  Darwin is
29    basically a BSD user layer laid over a Mach kernel, then evolved
30    for many years (at NeXT) in parallel with other Unix systems.  So
31    while the runtime is a somewhat idiosyncratic Mach-based thing,
32    other definitions look like they would for a BSD variant.  */
33
34 /* Although NeXT ran on many different architectures, as of Jan 2001
35    the only supported Darwin targets are PowerPC and x86.  */
36
37 /* One of Darwin's NeXT legacies is the Mach-O format, which is partly
38    like a.out and partly like COFF, with additional features like
39    multi-architecture binary support.  */
40
41 #define OBJECT_FORMAT_MACHO
42
43 /* Don't assume anything about the header files.  */
44 #define NO_IMPLICIT_EXTERN_C
45
46 /* Suppress g++ attempt to link in the math library automatically. */
47 #define MATH_LIBRARY ""
48
49 /* We have atexit.  */
50
51 #define HAVE_ATEXIT
52
53 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
54
55 #define DO_GLOBAL_DTORS_BODY
56
57 /* The string value for __SIZE_TYPE__.  */
58
59 #ifndef SIZE_TYPE
60 #define SIZE_TYPE "long unsigned int"
61 #endif
62
63 /* Type used for ptrdiff_t, as a string used in a declaration.  */
64
65 #undef  PTRDIFF_TYPE
66 #define PTRDIFF_TYPE "int"
67
68 /* wchar_t is int.  */
69
70 #undef  WCHAR_TYPE
71 #define WCHAR_TYPE "int"
72 #undef  WCHAR_TYPE_SIZE
73 #define WCHAR_TYPE_SIZE 32
74
75 /* Default to using the NeXT-style runtime, since that's what is
76    pre-installed on Darwin systems.  */
77
78 #define NEXT_OBJC_RUNTIME
79
80 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
81    we want to retain compatibility with older gcc versions.  */
82
83 #undef  DEFAULT_PCC_STRUCT_RETURN
84 #define DEFAULT_PCC_STRUCT_RETURN 0
85
86 /* True if pragma ms_struct is in effect.  */
87 extern GTY(()) int darwin_ms_struct;
88
89 /* This table intercepts weirdo options whose names would interfere
90    with normal driver conventions, and either translates them into
91    standardly-named options, or adds a 'Z' so that they can get to
92    specs processing without interference.
93
94    Do not expand a linker option to "-Xlinker -<option>", since that
95    forfeits the ability to control via spec strings later.  However,
96    as a special exception, do this translation with -filelist, because
97    otherwise the driver will think there are no input files and quit.
98    (The alternative would be to hack the driver to recognize -filelist
99    specially, but it's simpler to use the translation table.)
100
101    Note that an option name with a prefix that matches another option
102    name, that also takes an argument, needs to be modified so the
103    prefix is different, otherwise a '*' after the shorter option will
104    match with the longer one.
105
106    The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
107    in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
108    command-line option translations specific to the particular target
109    architecture.  */
110
111 #define TARGET_OPTION_TRANSLATE_TABLE \
112   { "-all_load", "-Zall_load" },  \
113   { "-allowable_client", "-Zallowable_client" },  \
114   { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
115   { "-bind_at_load", "-Zbind_at_load" },  \
116   { "-bundle", "-Zbundle" },  \
117   { "-bundle_loader", "-Zbundle_loader" },  \
118   { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
119   { "-dead_strip", "-Zdead_strip" }, \
120   { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
121   { "-dependency-file", "-MF" }, \
122   { "-dylib_file", "-Zdylib_file" }, \
123   { "-dynamic", "-Zdynamic" },  \
124   { "-dynamiclib", "-Zdynamiclib" },  \
125   { "-exported_symbols_list", "-Zexported_symbols_list" },  \
126   { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
127   { "-gused", "-g -feliminate-unused-debug-symbols" }, \
128   { "-segaddr", "-Zsegaddr" }, \
129   { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
130   { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
131   { "-seg_addr_table", "-Zseg_addr_table" }, \
132   { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
133   { "-umbrella", "-Zumbrella" }, \
134   { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \
135   { "-filelist", "-Xlinker -filelist -Xlinker" },  \
136   { "-findirect-virtual-calls", "-fapple-kext" }, \
137   { "-flat_namespace", "-Zflat_namespace" },  \
138   { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
139   { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
140   { "-framework", "-Xlinker -framework -Xlinker" },  \
141   { "-fterminated-vtables", "-fapple-kext" }, \
142   { "-image_base", "-Zimage_base" },  \
143   { "-init", "-Zinit" },  \
144   { "-install_name", "-Zinstall_name" },  \
145   { "-mkernel", "-mkernel -static -Wa,-static" }, \
146   { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
147   { "-multiply_defined", "-Zmultiply_defined" },  \
148   { "-multi_module", "-Zmulti_module" },  \
149   { "-static", "-static -Wa,-static" },  \
150   { "-shared", "-Zdynamiclib" }, \
151   { "-single_module", "-Zsingle_module" },  \
152   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
153   SUBTARGET_OPTION_TRANSLATE_TABLE
154
155 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
156   do {                                                                  \
157     darwin_override_options ();                                         \
158   } while (0)
159
160 /* These compiler options take n arguments.  */
161
162 #undef  WORD_SWITCH_TAKES_ARG
163 #define WORD_SWITCH_TAKES_ARG(STR)              \
164   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
165    !strcmp (STR, "Zallowable_client") ? 1 :     \
166    !strcmp (STR, "arch") ? 1 :                  \
167    !strcmp (STR, "arch_only") ? 1 :             \
168    !strcmp (STR, "Zbundle_loader") ? 1 :        \
169    !strcmp (STR, "client_name") ? 1 :           \
170    !strcmp (STR, "compatibility_version") ? 1 : \
171    !strcmp (STR, "current_version") ? 1 :       \
172    !strcmp (STR, "Zdylib_file") ? 1 :           \
173    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
174    !strcmp (STR, "Zimage_base") ? 1 :           \
175    !strcmp (STR, "Zinit") ? 1 :                 \
176    !strcmp (STR, "Zinstall_name") ? 1 :         \
177    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
178    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
179    !strcmp (STR, "precomp-trustfile") ? 1 :     \
180    !strcmp (STR, "read_only_relocs") ? 1 :      \
181    !strcmp (STR, "sectcreate") ? 3 :            \
182    !strcmp (STR, "sectorder") ? 3 :             \
183    !strcmp (STR, "Zsegaddr") ? 2 :              \
184    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
185    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
186    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
187    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
188    !strcmp (STR, "seg1addr") ? 1 :              \
189    !strcmp (STR, "segprot") ? 3 :               \
190    !strcmp (STR, "sub_library") ? 1 :           \
191    !strcmp (STR, "sub_umbrella") ? 1 :          \
192    !strcmp (STR, "Zumbrella") ? 1 :             \
193    !strcmp (STR, "undefined") ? 1 :             \
194    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
195    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
196    !strcmp (STR, "pagezero_size") ? 1 :         \
197    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
198    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
199    !strcmp (STR, "sectalign") ? 3 :             \
200    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
201    !strcmp (STR, "segcreate") ? 3 :             \
202    !strcmp (STR, "dylinker_install_name") ? 1 : \
203    0)
204
205 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
206     if (flag_mkernel || flag_apple_kext)                                \
207       {                                                                 \
208         if (flag_use_cxa_atexit == 2)                                   \
209           flag_use_cxa_atexit = 0;                                      \
210         /* kexts should always be built without the coalesced sections  \
211            because the kernel loader doesn't grok such sections.  */    \
212         flag_weak = 0;                                                  \
213         /* No RTTI in kexts.  */                                        \
214         flag_rtti = 0;                                                  \
215       }                                                                 \
216   } while (0)
217
218 /* Machine dependent cpp options.  Don't add more options here, add
219    them to darwin_cpp_builtins in darwin-c.c.  */
220
221 #undef  CPP_SPEC
222 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
223         " %{pthread:-D_REENTRANT}"
224
225 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
226    precomp, libtool, and fat build additions.  Also we
227    don't specify a second %G after %L because libSystem is
228    self-contained and doesn't need to link against libgcc.a.  */
229 /* In general, random Darwin linker flags should go into LINK_SPEC
230    instead of LINK_COMMAND_SPEC.  The command spec is better for
231    specifying the handling of options understood by generic Unix
232    linkers, and for positional arguments like libraries.  */
233 #define LINK_COMMAND_SPEC "\
234 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
235     %(linker) %l %X %{d} %{s} %{t} %{Z} %{u*} \
236     %{A} %{e*} %{m} %{r} %{x} \
237     %{o*}%{!o:-o a.out} \
238     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
239     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
240     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
241     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
242     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
243 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
244     %{.c|.cc|.C|.cpp|.cp|.c++|.cxx|.CPP|.m|.mm: \
245     %{gdwarf-2:%{!gstabs*:%{!g0: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
246
247 #ifdef TARGET_SYSTEM_ROOT
248 #define LINK_SYSROOT_SPEC \
249   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
250 #else
251 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
252 #endif
253
254 /* Please keep the random linker options in alphabetical order (modulo
255    'Z' and 'no' prefixes). Note that options taking arguments may appear
256    multiple times on a command line with different arguments each time,
257    so put a * after their names so all of them get passed.  */
258 #define LINK_SPEC  \
259   "%{static}%{!static:-dynamic} \
260    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
261    %{!Zdynamiclib: \
262      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
263      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
264      %{Zbundle:-bundle} \
265      %{Zbundle_loader*:-bundle_loader %*} \
266      %{client_name*} \
267      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
268 } \
269      %{current_version*:%e-current_version only allowed with -dynamiclib} \
270      %{Zforce_flat_namespace:-force_flat_namespace} \
271      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
272      %{keep_private_externs} \
273      %{private_bundle} \
274     } \
275    %{Zdynamiclib: -dylib \
276      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
277      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
278      %{client_name*:%e-client_name not allowed with -dynamiclib} \
279      %{compatibility_version*:-dylib_compatibility_version %*} \
280      %{current_version*:-dylib_current_version %*} \
281      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
282      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
283      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
284      %{Zinstall_name*:-dylib_install_name %*} \
285      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
286      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
287     } \
288    %{Zall_load:-all_load} \
289    %{Zallowable_client*:-allowable_client %*} \
290    %{Zbind_at_load:-bind_at_load} \
291    %{Zarch_errors_fatal:-arch_errors_fatal} \
292    %{Zdead_strip:-dead_strip} \
293    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
294    %{Zdylib_file*:-dylib_file %*} \
295    %{Zdynamic:-dynamic}\
296    %{Zexported_symbols_list*:-exported_symbols_list %*} \
297    %{Zflat_namespace:-flat_namespace} \
298    %{headerpad_max_install_names*} \
299    %{Zimage_base*:-image_base %*} \
300    %{Zinit*:-init %*} \
301    %{!mmacosx-version-min=*:-macosx_version_min %(darwin_minversion)} \
302    %{mmacosx-version-min=*:-macosx_version_min %*} \
303    %{nomultidefs} \
304    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
305    %{Zmultiply_defined*:-multiply_defined %*} \
306    %{!Zmultiply_defined*:%{shared-libgcc: \
307      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
308      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
309    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
310    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
311    %{read_only_relocs} \
312    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
313    %{Zsegaddr*:-segaddr %*} \
314    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
315    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
316    %{Zseg_addr_table*: -seg_addr_table %*} \
317    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
318    %{sub_library*} %{sub_umbrella*} \
319    " LINK_SYSROOT_SPEC " \
320    %{twolevel_namespace} %{twolevel_namespace_hints} \
321    %{Zumbrella*: -umbrella %*} \
322    %{undefined*} \
323    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
324    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
325    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
326    %{X} \
327    %{y*} \
328    %{w} \
329    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
330    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
331    %{whatsloaded} %{dylinker_install_name*} \
332    %{dylinker} %{Mach} "
333
334
335 /* Machine dependent libraries.  */
336
337 #define LIB_SPEC "%{!static:-lSystem}"
338
339 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
340    libraries to link against, and by not linking against libgcc_s on
341    earlier-than-10.3.9.
342
343    Note that by default, -lgcc_eh is not linked against!  This is
344    because in a future version of Darwin the EH frame information may
345    be in a new format, or the fallback routine might be changed; if
346    you want to explicitly link against the static version of those
347    routines, because you know you don't need to unwind through system
348    libraries, you need to explicitly say -static-libgcc.
349
350    If it is linked against, it has to be before -lgcc, because it may
351    need symbols from -lgcc.  */
352 #undef REAL_LIBGCC_SPEC
353 #define REAL_LIBGCC_SPEC                                                   \
354    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
355       shared-libgcc|fexceptions|fgnu-runtime:                              \
356        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
357        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
358        -lgcc;                                                              \
359       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
360        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
361        -lgcc}"
362
363 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
364
365    crt3.o provides __cxa_atexit on systems that don't have it.  Since
366    it's only used with C++, which requires passing -shared-libgcc, key
367    off that to avoid unnecessarily adding a destructor to every
368    powerpc program built.  */
369
370 #undef  STARTFILE_SPEC
371 #define STARTFILE_SPEC                                                      \
372   "%{Zdynamiclib: %(darwin_dylib1) }                                        \
373    %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
374      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
375                      %{!static:%{object:-lgcrt0.o}                          \
376                                %{!object:%{preload:-lgcrt0.o}               \
377                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
378                 %{!pg:%{static:-lcrt0.o}                                    \
379                       %{!static:%{object:-lcrt0.o}                          \
380                                 %{!object:%{preload:-lcrt0.o}               \
381                                   %{!preload: %(darwin_crt1)                \
382                                               %(darwin_crt2)}}}}}}          \
383   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
384
385 /* The native Darwin linker doesn't necessarily place files in the order
386    that they're specified on the link line.  Thus, it is pointless
387    to put anything in ENDFILE_SPEC.  */
388 /* #define ENDFILE_SPEC "" */
389
390 #define DARWIN_EXTRA_SPECS                                              \
391   { "darwin_crt1", DARWIN_CRT1_SPEC },                                  \
392   { "darwin_dylib1", DARWIN_DYLIB1_SPEC },                              \
393   { "darwin_minversion", DARWIN_MINVERSION_SPEC },
394
395 #define DARWIN_DYLIB1_SPEC                                              \
396   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)           \
397    %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
398
399 #define DARWIN_CRT1_SPEC                                                \
400   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)             \
401    %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
402
403 /* Default Darwin ASM_SPEC, very simple.  */
404 #define ASM_SPEC "-arch %(darwin_arch) \
405   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
406
407 /* We still allow output of STABS.  */
408
409 #define DBX_DEBUGGING_INFO 1
410
411 #define DWARF2_DEBUGGING_INFO
412 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
413
414 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
415 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
416 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
417 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
418 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
419 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
420 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
421 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
422 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
423 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
424 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
425
426 /* When generating stabs debugging, use N_BINCL entries.  */
427
428 #define DBX_USE_BINCL
429
430 /* There is no limit to the length of stabs strings.  */
431
432 #define DBX_CONTIN_LENGTH 0
433
434 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
435
436 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
437
438 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
439 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
440
441 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
442    sections.  machopic_select_section ensures that weak variables go in
443    coalesced sections.  Weak aliases (or any other kind of aliases) are
444    not supported.  Weak symbols that aren't visible outside the .s file
445    are not supported.  */
446 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
447   do {                                                                  \
448     if (ALIAS)                                                          \
449       {                                                                 \
450         warning (0, "alias definitions not supported in Mach-O; ignored");      \
451         break;                                                          \
452       }                                                                 \
453                                                                         \
454     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
455       targetm.asm_out.globalize_label (FILE, NAME);                     \
456     if (DECL_EXTERNAL (DECL))                                           \
457       fputs ("\t.weak_reference ", FILE);                               \
458     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
459         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
460       break;                                                            \
461     else if (TREE_PUBLIC (DECL))                                        \
462       fputs ("\t.weak_definition ", FILE);                              \
463     else                                                                \
464       break;                                                            \
465     assemble_name (FILE, NAME);                                         \
466     fputc ('\n', FILE);                                                 \
467   } while (0)
468
469 /* Darwin has the pthread routines in libSystem, which every program
470    links to, so there's no need for weak-ness for that.  */
471 #define GTHREAD_USE_WEAK 0
472
473 /* The Darwin linker imposes two limitations on common symbols: they
474    can't have hidden visibility, and they can't appear in dylibs.  As
475    a consequence, we should never use common symbols to represent
476    vague linkage. */
477 #undef USE_COMMON_FOR_ONE_ONLY
478 #define USE_COMMON_FOR_ONE_ONLY 0
479
480 /* The Darwin linker doesn't want coalesced symbols to appear in
481    a static archive's table of contents. */
482 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
483 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
484
485 /* On Darwin, we don't (at the time of writing) have linkonce sections
486    with names, so it's safe to make the class data not comdat.  */
487 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
488
489 /* For efficiency, on Darwin the RTTI information that is always
490    emitted in the standard C++ library should not be COMDAT.  */
491 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
492
493 /* We make exception information linkonce. */
494 #undef TARGET_USES_WEAK_UNWIND_INFO
495 #define TARGET_USES_WEAK_UNWIND_INFO 1
496
497 /* We need to use a nonlocal label for the start of an EH frame: the
498    Darwin linker requires that a coalesced section start with a label.
499    Unfortunately, it also requires that 'debug' sections don't contain
500    labels.  */
501 #undef FRAME_BEGIN_LABEL
502 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
503
504 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
505    emit a label for an empty FDE. */
506 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
507
508 /* Emit a label to separate the exception table.  */
509 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
510
511 /* Our profiling scheme doesn't LP labels and counter words.  */
512
513 #define NO_PROFILE_COUNTERS     1
514
515 #undef  INIT_SECTION_ASM_OP
516 #define INIT_SECTION_ASM_OP
517
518 #undef  INVOKE__main
519
520 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
521 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
522
523 /* Always prefix with an underscore.  */
524
525 #define USER_LABEL_PREFIX "_"
526
527 /* Don't output a .file directive.  That is only used by the assembler for
528    error reporting.  */
529 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
530 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
531
532 #undef  TARGET_ASM_FILE_END
533 #define TARGET_ASM_FILE_END darwin_file_end
534
535 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
536   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
537
538 /* Give ObjC methods pretty symbol names.  */
539
540 #undef  OBJC_GEN_METHOD_LABEL
541 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
542   do { if (CAT_NAME)                                                    \
543          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
544                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
545        else                                                             \
546          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
547                   (CLASS_NAME), (SEL_NAME));                            \
548      } while (0)
549
550 /* The RTTI data (e.g., __ti4name) is common and public (and static),
551    but it does need to be referenced via indirect PIC data pointers.
552    The machopic_define_symbol calls are telling the machopic subsystem
553    that the name *is* defined in this module, so it doesn't need to
554    make them indirect.  */
555
556 #undef ASM_DECLARE_OBJECT_NAME
557 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
558   do {                                                                  \
559     const char *xname = NAME;                                           \
560     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
561       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
562     if (! DECL_WEAK (DECL)                                              \
563         && ((TREE_STATIC (DECL)                                         \
564              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
565             || DECL_INITIAL (DECL)))                                    \
566         machopic_define_symbol (DECL_RTL (DECL));                       \
567     if ((TREE_STATIC (DECL)                                             \
568          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
569         || DECL_INITIAL (DECL))                                         \
570       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
571     ASM_OUTPUT_LABEL (FILE, xname);                                     \
572     /* Darwin doesn't support zero-size objects, so give them a         \
573        byte.  */                                                        \
574     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
575       assemble_zeros (1);                                               \
576   } while (0)
577
578 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
579   do {                                                                  \
580     const char *xname = NAME;                                           \
581     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
582       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
583     if (! DECL_WEAK (DECL)                                              \
584         && ((TREE_STATIC (DECL)                                         \
585              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
586             || DECL_INITIAL (DECL)))                                    \
587         machopic_define_symbol (DECL_RTL (DECL));                       \
588     if ((TREE_STATIC (DECL)                                             \
589          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
590         || DECL_INITIAL (DECL))                                         \
591       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
592     ASM_OUTPUT_LABEL (FILE, xname);                                     \
593   } while (0)
594
595 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
596   do {                                                          \
597     ASM_OUTPUT_LABEL (FILE, NAME);                              \
598     /* Darwin doesn't support zero-size objects, so give them a \
599        byte.  */                                                \
600     if ((SIZE) == 0)                                            \
601       assemble_zeros (1);                                       \
602   } while (0)
603
604 /* Wrap new method names in quotes so the assembler doesn't gag.
605    Make Objective-C internal symbols local.  */
606
607 #undef  ASM_OUTPUT_LABELREF
608 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
609   do {                                                                       \
610        const char *xname = (NAME);                                           \
611        if (! strcmp (xname, "<pic base>"))                                   \
612          machopic_output_function_base_name(FILE);                           \
613        else if (xname[0] == '&' || xname[0] == '*')                          \
614          {                                                                   \
615            int len = strlen (xname);                                         \
616            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
617              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
618            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
619              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
620            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
621              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
622            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
623              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
624            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
625              fprintf (FILE, "\"%s\"", &xname[1]);                            \
626            else                                                              \
627              fputs (&xname[1], FILE);                                        \
628          }                                                                   \
629        else if (xname[0] == '+' || xname[0] == '-')                          \
630          fprintf (FILE, "\"%s\"", xname);                                    \
631        else if (!strncmp (xname, "_OBJC_", 6))                               \
632          fprintf (FILE, "L%s", xname);                                       \
633        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
634          fprintf (FILE, "%s", xname);                                        \
635        else if (xname[0] != '"' && name_needs_quotes (xname))                \
636          fprintf (FILE, "\"%s\"", xname);                                    \
637        else                                                                  \
638          asm_fprintf (FILE, "%U%s", xname);                                  \
639   } while (0)
640
641 /* Output before executable code.  */
642 #undef TEXT_SECTION_ASM_OP
643 #define TEXT_SECTION_ASM_OP "\t.text"
644
645 /* Output before writable data.  */
646
647 #undef DATA_SECTION_ASM_OP
648 #define DATA_SECTION_ASM_OP "\t.data"
649
650 #undef  ALIGN_ASM_OP
651 #define ALIGN_ASM_OP            ".align"
652
653 #undef  ASM_OUTPUT_ALIGN
654 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
655   if ((LOG) != 0)                       \
656     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
657
658 /* Ensure correct alignment of bss data.  */
659
660 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
661 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
662   do {                                                                  \
663     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
664     fputs (".lcomm ", (FILE));                                          \
665     assemble_name ((FILE), (NAME));                                     \
666     if (_new_size == 0) _new_size = 1;                                  \
667     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
668              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
669     if ((DECL) && ((TREE_STATIC (DECL)                                  \
670          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
671         || DECL_INITIAL (DECL)))                                        \
672       {                                                                 \
673         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
674         machopic_define_symbol (DECL_RTL (DECL));                       \
675       }                                                                 \
676   } while (0)
677
678 /* The maximum alignment which the object file format can support in
679    bits.  For Mach-O, this is 2^15 bytes.  */
680
681 #undef  MAX_OFILE_ALIGNMENT
682 #define MAX_OFILE_ALIGNMENT (0x8000 * 8)
683
684 /* Declare the section variables.  */
685 #ifndef USED_FOR_TARGET
686 enum darwin_section_enum {
687 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
688 #include "darwin-sections.def"
689 #undef DEF_SECTION
690   NUM_DARWIN_SECTIONS
691 };
692 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
693 #endif
694
695 #undef  TARGET_ASM_SELECT_SECTION
696 #define TARGET_ASM_SELECT_SECTION machopic_select_section
697 #define USE_SELECT_SECTION_FOR_FUNCTIONS
698
699 #undef  TARGET_ASM_SELECT_RTX_SECTION
700 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
701 #undef  TARGET_ASM_UNIQUE_SECTION
702 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
703 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
704 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
705 #undef  TARGET_ASM_RELOC_RW_MASK
706 #define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask
707
708
709 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
710     do {                                                                \
711          if (FILE) {                                                    \
712            if (MACHOPIC_INDIRECT)                                       \
713              fprintf (FILE, "\t.lazy_reference ");                      \
714            else                                                         \
715              fprintf (FILE, "\t.reference ");                           \
716            assemble_name (FILE, NAME);                                  \
717            fprintf (FILE, "\n");                                        \
718          }                                                              \
719        } while (0)
720
721 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
722     do {                                                                \
723          if (FILE) {                                                    \
724            fprintf (FILE, "\t");                                        \
725            assemble_name (FILE, NAME);                                  \
726            fprintf (FILE, "=0\n");                                      \
727            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
728          }                                                              \
729        } while (0)
730
731 /* Globalizing directive for a label.  */
732 #define GLOBAL_ASM_OP ".globl "
733 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
734
735 /* Emit an assembler directive to set visibility for a symbol.  Used
736    to support visibility attribute and Darwin's private extern
737    feature.  */
738 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
739 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
740
741 /* Extra attributes for Darwin.  */
742 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
743   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
744   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
745     darwin_handle_kext_attribute },                                          \
746   { "weak_import", 0, 0, true, false, false,                                 \
747     darwin_handle_weak_import_attribute }
748
749 #undef ASM_GENERATE_INTERNAL_LABEL
750 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
751   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
752
753 #undef TARGET_ASM_MARK_DECL_PRESERVED
754 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
755
756 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
757    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
758    variable has been defined in this translation unit.
759    When porting Mach-O to new architectures you need to make
760    sure these aren't clobbered by the backend.  */
761
762 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
763 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
764
765 /* Set on a symbol to indicate when fix-and-continue style code
766    generation is being used and the symbol refers to a static symbol
767    that should be rebound from new instances of a translation unit to
768    the original instance of the data.  */
769
770 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
771
772 /* Symbolic names for various things we might know about a symbol.  */
773
774 enum machopic_addr_class {
775   MACHOPIC_UNDEFINED,
776   MACHOPIC_DEFINED_DATA,
777   MACHOPIC_UNDEFINED_DATA,
778   MACHOPIC_DEFINED_FUNCTION,
779   MACHOPIC_UNDEFINED_FUNCTION
780 };
781
782 /* Macros defining the various PIC cases.  */
783
784 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
785 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
786 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
787 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
788
789 #undef TARGET_ENCODE_SECTION_INFO
790 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
791 #undef TARGET_STRIP_NAME_ENCODING
792 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
793
794 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
795   do {                                                          \
796     const char *const stub_ = (STUB);                           \
797     char *buffer_ = (BUF);                                      \
798     strcpy (buffer_, stub_);                                    \
799     if (stub_[0] == '"')                                        \
800       {                                                         \
801         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
802       }                                                         \
803     else                                                        \
804       {                                                         \
805         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
806       }                                                         \
807   } while (0)
808
809 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
810   do {                                                          \
811     const char *const symbol_ = (SYMBOL);                       \
812     char *buffer_ = (BUF);                                      \
813     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
814       {                                                         \
815           sprintf (buffer_, "\"%s\"", symbol_);                 \
816       }                                                         \
817     else                                                        \
818       {                                                         \
819         strcpy (buffer_, symbol_);                              \
820       }                                                         \
821   } while (0)
822
823 /* Given a symbol name string, create the lazy pointer version
824    of the symbol name.  */
825
826 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
827   do {                                                          \
828     const char *symbol_ = (SYMBOL);                             \
829     char *buffer_ = (BUF);                                      \
830     if (symbol_[0] == '"')                                      \
831       {                                                         \
832         strcpy (buffer_, "\"L");                                \
833         strcpy (buffer_ + 2, symbol_ + 1);                      \
834         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
835       }                                                         \
836     else if (name_needs_quotes (symbol_))                       \
837       {                                                         \
838         strcpy (buffer_, "\"L");                                \
839         strcpy (buffer_ + 2, symbol_);                          \
840         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
841       }                                                         \
842     else                                                        \
843       {                                                         \
844         strcpy (buffer_, "L");                                  \
845         strcpy (buffer_ + 1, symbol_);                          \
846         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
847       }                                                         \
848   } while (0)
849
850 #define EH_FRAME_SECTION_NAME   "__TEXT"
851 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
852
853 /* Java runtime class list.  */
854 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
855
856 #undef ASM_PREFERRED_EH_DATA_FORMAT
857 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
858   (((CODE) == 2 && (GLOBAL) == 1) \
859    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
860      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
861
862 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
863   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
864
865 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
866   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
867
868 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
869       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
870         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
871         goto DONE;                                                                      \
872       }
873
874 /* Experimentally, putting jump tables in text is faster on SPEC.
875    Also this is needed for correctness for coalesced functions.  */
876
877 #ifndef JUMP_TABLES_IN_TEXT_SECTION
878 #define JUMP_TABLES_IN_TEXT_SECTION 1
879 #endif
880
881 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
882
883 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
884 #undef TARGET_ASM_NAMED_SECTION
885 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
886
887 /* Handle pragma weak and pragma pack.  */
888 #define HANDLE_SYSV_PRAGMA 1
889
890 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
891
892 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
893   do {                                                          \
894     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
895     c_register_pragma (0, "options", darwin_pragma_options);    \
896     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
897     c_register_pragma (0, "unused", darwin_pragma_unused);      \
898     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
899   } while (0)
900
901 #undef ASM_APP_ON
902 #define ASM_APP_ON ""
903 #undef ASM_APP_OFF
904 #define ASM_APP_OFF ""
905
906 void darwin_register_frameworks (const char *, const char *, int);
907 void darwin_register_objc_includes (const char *, const char *, int);
908 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
909 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
910
911 void add_framework_path (char *);
912 #define TARGET_OPTF add_framework_path
913
914 #define TARGET_POSIX_IO
915
916 /* All new versions of Darwin have C99 functions.  */
917
918 #define TARGET_C99_FUNCTIONS 1
919
920 #define WINT_TYPE "int"
921
922 /* Every program on darwin links against libSystem which contains the pthread
923    routines, so there's no need to explicitly call out when doing threaded
924    work.  */
925
926 #undef GOMP_SELF_SPECS
927 #define GOMP_SELF_SPECS ""
928
929 /* Darwin can't support anchors until we can cope with the adjustments
930    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
931    when outputting members of an anchor block and the linker can be
932    taught to keep them together or we find some other suitable
933    code-gen technique.  */
934
935 #if 0
936 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
937 #else
938 #define TARGET_ASM_OUTPUT_ANCHOR NULL
939 #endif
940
941 /* Attempt to turn on execute permission for the stack.  This may be
942     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
943     if the target machine can change execute permissions on a page).
944
945     There is no way to query the execute permission of the stack, so
946     we always issue the mprotect() call.
947
948     Unfortunately it is not possible to make this namespace-clean.
949
950     Also note that no errors should be emitted by this code; it is
951     considered dangerous for library calls to send messages to
952     stdout/stderr.  */
953
954 #define ENABLE_EXECUTE_STACK                                            \
955 extern void __enable_execute_stack (void *);                            \
956 void                                                                    \
957 __enable_execute_stack (void *addr)                                     \
958 {                                                                       \
959    extern int mprotect (void *, size_t, int);                           \
960    extern int getpagesize (void);                                       \
961    static int size;                                                     \
962    static long mask;                                                    \
963                                                                         \
964    char *page, *end;                                                    \
965                                                                         \
966    if (size == 0)                                                       \
967      {                                                                  \
968        size = getpagesize();                                            \
969        mask = ~((long) size - 1);                                       \
970      }                                                                  \
971                                                                         \
972    page = (char *) (((long) addr) & mask);                              \
973    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
974                                                                         \
975    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
976    (void) mprotect (page, end - page, 7);                               \
977 }
978
979 /* For Apple KEXTs, we make the constructors return this to match gcc
980    2.95.  */
981 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
982 extern int flag_mkernel;
983 extern int flag_apple_kext;
984 #define TARGET_KEXTABI flag_apple_kext
985
986 #define TARGET_HAS_TARGETCM 1
987
988 #endif /* CONFIG_DARWIN_H */