-fno-implement-inlines -fms-extensions @gol
-fno-nonansi-builtins -fno-operator-names @gol
-fno-optional-diags -fpermissive @gol
+-fno-pretty-templates @gol
-frepo -fno-rtti -fstats -ftemplate-depth-@var{n} @gol
-fno-threadsafe-statics -fuse-cxa-atexit -fno-weak -nostdinc++ @gol
-fno-default-inline -fvisibility-inlines-hidden @gol
-print-multi-directory -print-multi-lib @gol
-print-prog-name=@var{program} -print-search-dirs -Q @gol
-print-sysroot -print-sysroot-headers-suffix @gol
--save-temps -time}
+-save-temps -save-temps=cwd -save-temps=obj -time}
@item Optimization Options
@xref{Optimize Options,,Options that Control Optimization}.
-freciprocal-math -fregmove -frename-registers -freorder-blocks @gol
-freorder-blocks-and-partition -freorder-functions @gol
-frerun-cse-after-loop -freschedule-modulo-scheduled-loops @gol
--frounding-math -frtl-abstract-sequences -fsched2-use-superblocks @gol
+-frounding-math -fsched2-use-superblocks @gol
-fsched2-use-traces -fsched-spec-load -fsched-spec-load-dangerous @gol
-fsched-stalled-insns-dep[=@var{n}] -fsched-stalled-insns[=@var{n}] @gol
-fschedule-insns -fschedule-insns2 -fsection-anchors -fsee @gol
@emph{AVR Options}
@gccoptlist{-mmcu=@var{mcu} -msize -minit-stack=@var{n} -mno-interrupts @gol
--mcall-prologues -mno-tablejump -mtiny-stack -mint8}
+-mcall-prologues -mtiny-stack -mint8}
@emph{Blackfin Options}
@gccoptlist{-mcpu=@var{cpu}@r{[}-@var{sirevision}@r{]} @gol
warnings. Thus, using @option{-fpermissive} will allow some
nonconforming code to compile.
+@item -fno-pretty-templates
+@opindex fno-pretty-templates
+When an error message refers to a specialization of a function
+template, the compiler will normally print the signature of the
+template followed by the template arguments and any typedefs or
+typenames in the signature (e.g. @code{void f(T) [with T = int]}
+rather than @code{void f(int)}) so that it's clear which template is
+involved. When an error message refers to a specialization of a class
+template, the compiler will omit any template arguments which match
+the default template arguments for that template. If either of these
+behaviors make it harder to understand the error message rather than
+easier, using @option{-fno-pretty-templates} will disable them.
+
@item -frepo
@opindex frepo
Enable automatic template instantiation at link time. This option also
dependence info.
@item -save-temps
+@itemx -save-temps=cwd
@opindex save-temps
Store the usual ``temporary'' intermediate files permanently; place them
in the current directory and name them based on the source file. Thus,
The corresponding intermediate file may be obtained by renaming the
source file before using @option{-save-temps}.
+If you invoke GCC in parallel, compiling several different source
+files that share a common base name in different subdirectories or the
+same source file compiled for multiple output destinations, it is
+likely that the different parallel compilers will interfere with each
+other, and overwrite the temporary files. For instance:
+
+@smallexample
+gcc -save-temps -o outdir1/foo.o indir1/foo.c&
+gcc -save-temps -o outdir2/foo.o indir2/foo.c&
+@end smallexample
+
+may result in @file{foo.i} and @file{foo.o} being written to
+simultaneously by both compilers.
+
+@item -save-temps=obj
+@opindex save-temps=obj
+Store the usual ``temporary'' intermediate files permanently. If the
+@option{-o} option is used, the temporary files are based on the
+object file. If the @option{-o} option is not used, the
+@option{-save-temps=obj} switch behaves like @option{-save-temps}.
+
+For example:
+
+@smallexample
+gcc -save-temps=obj -c foo.c
+gcc -save-temps=obj -c bar.c -o dir/xbar.o
+gcc -save-temps=obj foobar.c -o dir2/yfoobar
+@end smallexample
+
+would create @file{foo.i}, @file{foo.s}, @file{dir/xbar.i},
+@file{dir/xbar.s}, @file{dir2/yfoobar.i}, @file{dir2/yfoobar.s}, and
+@file{dir2/yfoobar.o}.
+
@item -time
@opindex time
Report the CPU time taken by each subprocess in the compilation
each of them.
Not all optimizations are controlled directly by a flag. Only
-optimizations that have a flag are listed.
+optimizations that have a flag are listed in this section.
+
+Depending on the target and how GCC was configured, a slightly different
+set of optimizations may be enabled at each @option{-O} level than
+those listed here. You can invoke GCC with @samp{-Q --help=optimizers}
+to find out the exact set of optimizations that are enabled at each level.
+@xref{Overall Options}, for examples.
@table @gcctabopt
@item -O
@option{-fno-delete-null-pointer-checks} to disable this optimization
for programs which depend on that behavior.
-Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
+Enabled by default.
@item -fexpensive-optimizations
@opindex fexpensive-optimizations
using C99's @code{FENV_ACCESS} pragma. This command line option
will be used to specify the default state for @code{FENV_ACCESS}.
-@item -frtl-abstract-sequences
-@opindex frtl-abstract-sequences
-It is a size optimization method. This option is to find identical
-sequences of code, which can be turned into pseudo-procedures and
-then replace all occurrences with calls to the newly created
-subroutine. It is kind of an opposite of @option{-finline-functions}.
-This optimization runs at RTL level.
-
@item -fsignaling-nans
@opindex fsignaling-nans
Compile code assuming that IEEE signaling NaNs may generate user-visible
@item max-cse-insns
The maximum instructions CSE process before flushing. The default is 1000.
-@item max-aliased-vops
-
-Maximum number of virtual operands per function allowed to represent
-aliases before triggering the alias partitioning heuristic. Alias
-partitioning reduces compile times and memory consumption needed for
-aliasing at the expense of precision loss in alias information. The
-default value for this parameter is 100 for -O1, 500 for -O2 and 1000
-for -O3.
-
-Notice that if a function contains more memory statements than the
-value of this parameter, it is not really possible to achieve this
-reduction. In this case, the compiler will use the number of memory
-statements as the value for @option{max-aliased-vops}.
-
-@item avg-aliased-vops
-
-Average number of virtual operands per statement allowed to represent
-aliases before triggering the alias partitioning heuristic. This
-works in conjunction with @option{max-aliased-vops}. If a function
-contains more than @option{max-aliased-vops} virtual operators, then
-memory symbols will be grouped into memory partitions until either the
-total number of virtual operators is below @option{max-aliased-vops}
-or the average number of virtual operators per memory statement is
-below @option{avg-aliased-vops}. The default value for this parameter
-is 1 for -O1 and -O2, and 3 for -O3.
-
@item ggc-min-expand
GCC uses a garbage collector to manage its own memory allocation. This
use the 32-bit ARM instruction set.
This option automatically enables either 16-bit Thumb-1 or
mixed 16/32-bit Thumb-2 instructions based on the @option{-mcpu=@var{name}}
-and @option{-march=@var{name}} options.
+and @option{-march=@var{name}} options. This option is not passed to the
+assembler. If you want to force assembler files to be interpreted as Thumb code,
+either add a @samp{.thumb} directive to the source or pass the @option{-mthumb}
+option directly to the assembler by prefixing it with @option{-Wa}.
@item -mtpcs-frame
@opindex mtpcs-frame
Functions prologues/epilogues expanded as call to appropriate
subroutines. Code size will be smaller.
-@item -mno-tablejump
-@opindex mno-tablejump
-Do not generate tablejump insns which sometimes increase code size.
-
@item -mtiny-stack
@opindex mtiny-stack
Change only the low 8 bits of the stack pointer.
@item core2
Intel Core2 CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3 and SSSE3
instruction set support.
+@item atom
+Intel Atom CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3 and SSSE3
+instruction set support.
@item k6
AMD K6 CPU with MMX instruction set support.
@item k6-2, k6-3
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