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Enable -D_FORTIFY_SOURCE=2 by default |
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--- a/gcc/doc/invoke.texi |
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+++ b/gcc/doc/invoke.texi |
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@@ -5973,6 +5973,11 @@ also turns on the following optimization flags: |
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Please note the warning under @option{-fgcse} about |
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invoking @option{-O2} on programs that use computed gotos. |
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|
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+NOTE: In Gentoo, @option{-D_FORTIFY_SOURCE=2} is set by default, and is |
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+activated when @option{-O} is set to 2 or higher. This enables additional |
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+compile-time and run-time checks for several libc functions. To disable, |
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+specify either @option{-U_FORTIFY_SOURCE} or @option{-D_FORTIFY_SOURCE=0}. |
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+ |
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@item -O3 |
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@opindex O3 |
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Optimize yet more. @option{-O3} turns on all optimizations specified |
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--- a/gcc/gcc.c |
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+++ b/gcc/gcc.c |
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@@ -741,6 +741,7 @@ static const char *cpp_unique_options = |
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%{H} %C %{D*&U*&A*} %{i*} %Z %i\ |
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%{fmudflap:-D_MUDFLAP -include mf-runtime.h}\ |
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%{fmudflapth:-D_MUDFLAP -D_MUDFLAPTH -include mf-runtime.h}\ |
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+ %{!U_FORTIFY_SOURCE:%{!D_FORTIFY_SOURCE:%{!D_FORTIFY_SOURCE=*:-D_FORTIFY_SOURCE=2}}}\ |
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%{E|M|MM:%W{o*}}"; |
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|
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/* This contains cpp options which are common with cc1_options and are passed |
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