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Diffstat (limited to 'gcc-4.9/gcc/doc/invoke.texi')
-rw-r--r-- | gcc-4.9/gcc/doc/invoke.texi | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/gcc-4.9/gcc/doc/invoke.texi b/gcc-4.9/gcc/doc/invoke.texi index 698ecd659..297657a39 100644 --- a/gcc-4.9/gcc/doc/invoke.texi +++ b/gcc-4.9/gcc/doc/invoke.texi @@ -694,7 +694,8 @@ Objective-C and Objective-C++ Dialects}. -m32 -m64 -mx32 -m16 -mlarge-data-threshold=@var{num} @gol -msse2avx -mfentry -m8bit-idiv @gol -mavx256-split-unaligned-load -mavx256-split-unaligned-store @gol --mstack-protector-guard=@var{guard}} +-mstack-protector-guard=@var{guard} -mindirect-branch=@var{choice} @gol +-mfunction-return=@var{choice} -mindirect-branch-register} @emph{i386 and x86-64 Windows Options} @gccoptlist{-mconsole -mcygwin -mno-cygwin -mdll @gol @@ -16021,6 +16022,42 @@ locations are @samp{global} for global canary or @samp{tls} for per-thread canary in the TLS block (the default). This option has effect only when @option{-fstack-protector} or @option{-fstack-protector-all} is specified. +@item -mindirect-branch=@var{choice} +@opindex -mindirect-branch +Convert indirect call and jump with @var{choice}. The default is +@samp{keep}, which keeps indirect call and jump unmodified. +@samp{thunk} converts indirect call and jump to call and return thunk. +@samp{thunk-inline} converts indirect call and jump to inlined call +and return thunk. @samp{thunk-extern} converts indirect call and jump +to external call and return thunk provided in a separate object file. +You can control this behavior for a specific function by using the +function attribute @code{indirect_branch}. @xref{Function Attributes}. + +Note that @option{-mcmodel=large} is incompatible with +@option{-mindirect-branch=thunk} nor +@option{-mindirect-branch=thunk-extern} since the thunk function may +not be reachable in large code model. + +@item -mfunction-return=@var{choice} +@opindex -mfunction-return +Convert function return with @var{choice}. The default is @samp{keep}, +which keeps function return unmodified. @samp{thunk} converts function +return to call and return thunk. @samp{thunk-inline} converts function +return to inlined call and return thunk. @samp{thunk-extern} converts +function return to external call and return thunk provided in a separate +object file. You can control this behavior for a specific function by +using the function attribute @code{function_return}. +@xref{Function Attributes}. + +Note that @option{-mcmodel=large} is incompatible with +@option{-mfunction-return=thunk} nor +@option{-mfunction-return=thunk-extern} since the thunk function may +not be reachable in large code model. + +@item -mindirect-branch-register +@opindex -mindirect-branch-register +Force indirect call and jump via register. + @end table These @samp{-m} switches are supported in addition to the above |