-fno-default-inline -fvisibility-inlines-hidden @gol
-Wabi -Wctor-dtor-privacy @gol
-Wnon-virtual-dtor -Wreorder @gol
--Weffc++ -Wno-deprecated @gol
+-Weffc++ -Wno-deprecated -Wstrict-null-sentinel @gol
-Wno-non-template-friend -Wold-style-cast @gol
-Woverloaded-virtual -Wno-pmf-conversions @gol
--Wsign-promo -Wsynth}
+-Wsign-promo}
@item Objective-C and Objective-C++ Language Options
@xref{Objective-C and Objective-C++ Dialect Options,,Options Controlling
@item Language Independent Options
@xref{Language Independent Options,,Options to Control Diagnostic Messages Formatting}.
@gccoptlist{-fmessage-length=@var{n} @gol
--fdiagnostics-show-location=@r{[}once@r{|}every-line@r{]}}
+-fdiagnostics-show-location=@r{[}once@r{|}every-line@r{]}} @gol
+-fdiagnostics-show-options
@item Warning Options
@xref{Warning Options,,Options to Request or Suppress Warnings}.
-Wformat-security -Wformat-y2k @gol
-Wimplicit -Wimplicit-function-declaration -Wimplicit-int @gol
-Wimport -Wno-import -Winit-self -Winline @gol
+-Wno-int-to-pointer-cast @gol
-Wno-invalid-offsetof -Winvalid-pch @gol
-Wlarger-than-@var{len} -Wlong-long @gol
-Wmain -Wmissing-braces -Wmissing-field-initializers @gol
-Wmissing-format-attribute -Wmissing-include-dirs @gol
-Wmissing-noreturn @gol
-Wno-multichar -Wnonnull -Wpacked -Wpadded @gol
--Wparentheses -Wpointer-arith -Wredundant-decls @gol
+-Wparentheses -Wpointer-arith -Wno-pointer-to-int-cast @gol
+-Wredundant-decls @gol
-Wreturn-type -Wsequence-point -Wshadow @gol
-Wsign-compare -Wstrict-aliasing -Wstrict-aliasing=2 @gol
-Wswitch -Wswitch-default -Wswitch-enum @gol
-fdump-tree-salias @gol
-fdump-tree-fre@r{[}-@var{n}@r{]} @gol
-ftree-vectorizer-verbose=@var{n} @gol
+-fdump-tree-storeccp@r{[}-@var{n}@r{]} @gol
-feliminate-dwarf2-dups -feliminate-unused-debug-types @gol
-feliminate-unused-debug-symbols -fmem-report -fprofile-arcs -ftree-based-profiling @gol
-frandom-seed=@var{string} -fsched-verbose=@var{n} @gol
-fbranch-probabilities -fprofile-values -fvpt -fbranch-target-load-optimize @gol
-fbranch-target-load-optimize2 -fbtr-bb-exclusive @gol
-fcaller-saves -fcprop-registers -fcse-follow-jumps @gol
--fcse-follow-jumps -fcse-skip-blocks -fcx-limited-range -fdata-sections @gol
+-fcse-skip-blocks -fcx-limited-range -fdata-sections @gol
-fdelayed-branch -fdelete-null-pointer-checks @gol
-fexpensive-optimizations -ffast-math -ffloat-store @gol
-fforce-addr -fforce-mem -ffunction-sections @gol
-ftree-loop-linear -ftree-loop-im -ftree-loop-ivcanon -fivopts @gol
-ftree-dominator-opts -ftree-dse -ftree-copyrename -ftree-sink @gol
-ftree-ch -ftree-sra -ftree-ter -ftree-lrs -ftree-fre -ftree-vectorize @gol
--ftree-salias @gol
+-ftree-salias -fweb @gol
+-ftree-copy-prop -ftree-store-ccp -ftree-store-copy-prop @gol
--param @var{name}=@var{value}
-O -O0 -O1 -O2 -O3 -Os}
@gccoptlist{-mmcu=@var{mcu} -msize -minit-stack=@var{n} -mno-interrupts @gol
-mcall-prologues -mno-tablejump -mtiny-stack -mint8}
+@emph{Blackfin Options}
+@gccoptlist{-momit-leaf-frame-pointer -mno-omit-leaf-frame-pointer -mcsync @gol
+-mno-csync -mlow-64k -mno-low64k -mid-shared-library @gol
+-mno-id-shared-library -mshared-library-id=@var{n} @gol}
+
@emph{CRIS Options}
@gccoptlist{-mcpu=@var{cpu} -march=@var{cpu} -mtune=@var{cpu} @gol
-mmax-stack-frame=@var{n} -melinux-stacksize=@var{n} @gol
@opindex Wno-deprecated
Do not warn about usage of deprecated features. @xref{Deprecated Features}.
+@item -Wstrict-null-sentinel @r{(C++ only)}
+@opindex Wstrict-null-sentinel
+Warn also about the use of an uncasted @code{NULL} as sentinel. When
+compiling only with GCC this is a valid sentinel, as @code{NULL} is defined
+to @code{__null}. Although it is a null pointer constant not a null pointer,
+it is guaranteed to of the same size as a pointer. But this use is
+not portable across different compilers.
+
@item -Wno-non-template-friend @r{(C++ only)}
@opindex Wno-non-template-friend
Disable warnings when non-templatized friend functions are declared
the same size. Previous versions of G++ would try to preserve
unsignedness, but the standard mandates the current behavior.
-@item -Wsynth @r{(C++ only)}
-@opindex Wsynth
-@cindex warning for synthesized methods
-@cindex synthesized methods, warning
-Warn when G++'s synthesis behavior does not match that of cfront. For
-instance:
-
@smallexample
struct A @{
operator int ();
prefix) for physical lines that result from the process of breaking
a message which is too long to fit on a single line.
+@item -fdiagnostics-show-options
+@opindex fdiagnostics-show-options
+This option instructs the diagnostic machinery to add text to each
+diagnostic emitted, which indicates which command line option directly
+controls that diagnostic, when such an option is known to the
+diagnostic machinery.
+
@end table
@node Warning Options
The compiler uses a variety of heuristics to determine whether or not
to inline a function. For example, the compiler takes into account
-the size of the function being inlined and the the amount of inlining
+the size of the function being inlined and the amount of inlining
that has already been done in the current function. Therefore,
seemingly insignificant changes in the source program can cause the
warnings produced by @option{-Winline} to appear or disappear.
The restrictions on @samp{offsetof} may be relaxed in a future version
of the C++ standard.
+@item -Wno-int-to-pointer-cast @r{(C only)}
+@opindex Wno-int-to-pointer-cast
+Suppress warnings from casts to pointer type of an integer of a
+different size.
+
+@item -Wno-pointer-to-int-cast @r{(C only)}
+@opindex Wno-pointer-to-int-cast
+Suppress warnings from casts from a pointer to an integer type of a
+different size.
+
@item -Winvalid-pch
@opindex Winvalid-pch
Warn if a precompiled header (@pxref{Precompiled Headers}) is found in
@opindex fdump-rtl-btl
@opindex fdump-rtl-dbr
@option{-dd} and @option{-fdump-rtl-btl} enable dumping after branch
-target load optimization, to to @file{@var{file}.31.btl}. @option{-dd}
+target load optimization, to @file{@var{file}.31.btl}. @option{-dd}
and @option{-fdump-rtl-dbr} enable dumping after delayed branch
scheduling, to @file{@var{file}.36.dbr}.
Dump each function after CCP@. The file name is made by appending
@file{.ccp} to the source file name.
+@item storeccp
+@opindex fdump-tree-storeccp
+Dump each function after STORE-CCP. The file name is made by appending
+@file{.storeccp} to the source file name.
+
@item pre
@opindex fdump-tree-pre
Dump trees after partial redundancy elimination. The file name is made
Dump trees after full redundancy elimination. The file name is made
by appending @file{.fre} to the source file name.
+@item copyprop
+@opindex fdump-tree-copyprop
+Dump trees after copy propagation. The file name is made
+by appending @file{.copyprop} to the source file name.
+
+@item store_copyprop
+@opindex fdump-tree-store_copyprop
+Dump trees after store copy-propagation. The file name is made
+by appending @file{.store_copyprop} to the source file name.
+
@item dce
@opindex fdump-tree-dce
Dump each function after dead code elimination. The file name is made by
-fif-conversion2 @gol
-ftree-ccp @gol
-ftree-dce @gol
--ftree-dom @gol
+-ftree-dominator-opts @gol
-ftree-dse @gol
-ftree-ter @gol
--ftree-live_range_split @gol
+-ftree-lrs @gol
-ftree-sra @gol
-ftree-copyrename @gol
-ftree-fre @gol
This analysis faster than PRE, though it exposes fewer redundancies.
This flag is enabled by default at @option{-O} and higher.
+@item -ftree-copy-prop
+Perform copy propagation on trees. This pass eliminates unnecessary
+copy operations. This flag is enabled by default at @option{-O} and
+higher.
+
+@item -ftree-store-copy-prop
+Perform copy propagation of memory loads and stores. This pass
+eliminates unnecessary copy operations in memory references
+(structures, global variables, arrays, etc). This flag is enabled by
+default at @option{-O2} and higher.
+
@item -ftree-salias
Perform structural alias analysis on trees. This flag
is enabled by default at @option{-O} and higher.
enabled by default at @option{-O} and higher.
@item -ftree-ccp
-Perform sparse conditional constant propagation (CCP) on trees. This flag
-is enabled by default at @option{-O} and higher.
+Perform sparse conditional constant propagation (CCP) on trees. This
+pass only operates on local scalar variables and is enabled by default
+at @option{-O} and higher.
+
+@item -ftree-store-ccp
+Perform sparse conditional constant propagation (CCP) on trees. This
+pass operates on both local scalar variables and memory stores and
+loads (global variables, structures, arrays, etc). This flag is
+enabled by default at @option{-O2} and higher.
@item -ftree-dce
Perform dead code elimination (DCE) on trees. This flag is enabled by
Perform linear loop transformations on tree. This flag can improve cache
performance and allow further loop optimizations to take place.
-@item -ftree-lim
-Perform loop invariant motion on trees. This pass moves only invartiants that
-would be hard to handle on rtl level (function calls, operations that expand to
+@item -ftree-loop-im
+Perform loop invariant motion on trees. This pass moves only invariants that
+would be hard to handle at RTL level (function calls, operations that expand to
nontrivial sequences of insns). With @option{-funswitch-loops} it also moves
operands of conditions that are invariant out of the loop, so that we can use
just trivial invariantness analysis in loop unswitching. The pass also includes
store motion.
-@item -fivcanon
+@item -ftree-loop-ivcanon
Create a canonical counter for number of iterations in the loop for that
determining number of iterations requires complicated analysis. Later
optimizations then may determine the number easily. Useful especially
@var{name} are given in the following table:
@table @gcctabopt
+@item salias-max-implicit-fields
+The maximum number of fields in a variable without direct
+structure accesses for which structure aliasing will consider trying
+to track each field. The default is 5
+
@item sra-max-structure-size
The maximum structure size, in bytes, at which the scalar replacement
of aggregates (SRA) optimization will perform block copies. The
we always try to remove unnecessary ivs from the set during its
optimization when a new iv is added to the set.
+@item scev-max-expr-size
+Bound on size of expressions used in the scalar evolutions analyzer.
+Large expressions slow the analyzer.
+
@item max-iterations-to-track
The maximum number of iterations of a loop the brute force algorithm
compiler's memory usage and increasing its speed. This sets the maximum
value of a shared integer constant's. The default value is 256.
+@item min-virtual-mappings
+Specifies the minimum number of virtual mappings in the incremental
+SSA updater that should be registered to trigger the virtual mappings
+heuristic defined by virtual-mappings-ratio. The default value is
+100.
+
+@item virtual-mappings-ratio
+If the number of virtual mappings is virtual-mappings-ratio bigger
+than the number of virtual symbols to be updated, then the incremental
+SSA updater switches to a full update for those symbols. The default
+ratio is 3.
+
@end table
@end table
* ARC Options::
* ARM Options::
* AVR Options::
+* Blackfin Options::
* CRIS Options::
* Darwin Options::
* DEC Alpha Options::
size.
@end table
+@node Blackfin Options
+@subsection Blackfin Options
+@cindex Blackfin Options
+
+@table @gcctabopt
+@item -momit-leaf-frame-pointer
+@opindex momit-leaf-frame-pointer
+Don't keep the frame pointer in a register for leaf functions. This
+avoids the instructions to save, set up and restore frame pointers and
+makes an extra register available in leaf functions. The option
+@option{-fomit-frame-pointer} removes the frame pointer for all functions
+which might make debugging harder.
+
+@item -mcsync
+@opindex mcsync
+When enabled, the compiler will ensure that the generated code does not
+contain speculative loads after jump instructions. This option is enabled
+by default.
+
+@item -mno-csync
+@opindex mno-csync
+Don't generate extra code to prevent speculative loads from occurring.
+
+@item -mlow-64k
+@opindex mlow-64k
+When enabled, the compiler is free to take advantage of the knowledge that
+the entire program fits into the low 64k of memory.
+
+@item -mno-low-64k
+@opindex mno-low-64k
+Assume that the program is arbitrarily large. This is the default.
+
+@item -mid-shared-library
+@opindex mid-shared-library
+Generate code that supports shared libraries via the library ID method.
+This allows for execute in place and shared libraries in an environment
+without virtual memory management. This option implies @option{-fPIC}.
+
+@item -mno-id-shared-library
+@opindex mno-id-shared-library
+Generate code that doesn't assume ID based shared libraries are being used.
+This is the default.
+
+@item -mshared-library-id=n
+@opindex mshared-library-id
+Specified the identification number of the ID based shared library being
+compiled. Specifying a value of 0 will generate more compact code, specifying
+other values will force the allocation of that number to the current
+library but is no more space or time efficient than omitting this option.
+@end table
+
@node CRIS Options
@subsection CRIS Options
@cindex CRIS Options
that GCC is targetting, like @option{-mcpu} or @option{-march}. The
@option{-force_cpusubtype_ALL} option can be used to override this.
-The Darwin tools vary in their behaviour when presented with an ISA
+The Darwin tools vary in their behavior when presented with an ISA
mismatch. The assembler, @file{as}, will only permit instructions to
be used that are valid for the subtype of the file it is generating,
so you cannot put 64-bit instructions in an @samp{ppc750} object file.
@opindex msplit-addresses
@opindex mno-split-addresses
Enable (disable) use of the @code{%hi()} and @code{%lo()} assembler
-relocation operators. This option has been superceded by
+relocation operators. This option has been superseded by
@option{-mexplicit-relocs} but is retained for backwards compatibility.
@item -mexplicit-relocs
@samp{860}, @samp{970}, @samp{8540}, @samp{common}, @samp{ec603e}, @samp{G3},
@samp{G4}, @samp{G5}, @samp{power}, @samp{power2}, @samp{power3},
@samp{power4}, @samp{power5}, @samp{powerpc}, @samp{powerpc64},
-@samp{rios}, @samp{rios1}, @samp{rios2}, @samp{rsc}, and @samp{rs64a}.
+@samp{rios}, @samp{rios1}, @samp{rios2}, @samp{rsc}, and @samp{rs64}.
@option{-mcpu=common} selects a completely generic processor. Code
generated under this option will run on any POWER or PowerPC processor.
@opindex mapp-regs
Specify @option{-mapp-regs} to generate output using the global registers
2 through 4, which the SPARC SVR4 ABI reserves for applications. This
-is the default.
+is the default, except on Solaris.
To be fully SVR4 ABI compliant at the cost of some performance loss,
specify @option{-mno-app-regs}. You should compile libraries and system
@item -mlittle-endian
@opindex mlittle-endian
Generate code for a processor running in little-endian mode. It is only
-available for a few configurations and most notably not on Solaris.
+available for a few configurations and most notably not on Solaris and Linux.
@item -m32
@itemx -m64
Any macros defined before the precompiled header is included must
either be defined in the same way as when the precompiled header was
generated, or must not affect the precompiled header, which usually
-means that the they don't appear in the precompiled header at all.
+means that they don't appear in the precompiled header at all.
The @option{-D} option is one way to define a macro before a
precompiled header is included; using a @code{#define} can also do it.
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