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https://gitlab.alpinelinux.org/alpine/aports.git
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30 lines
1.2 KiB
Diff
30 lines
1.2 KiB
Diff
Enable -D_FORTIFY_SOURCE=2 by default.
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--- a/gcc/c-family/c-cppbuiltin.c
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+++ b/gcc/c-family/c-cppbuiltin.c
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@@ -951,6 +951,9 @@ c_cpp_builtins (cpp_reader *pfile)
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builtin_define_with_value ("__REGISTER_PREFIX__", REGISTER_PREFIX, 0);
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builtin_define_with_value ("__USER_LABEL_PREFIX__", user_label_prefix, 0);
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+ /* Fortify Source enabled by default w/optimization. */
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+ cpp_define (pfile, "_FORTIFY_SOURCE=((defined __OPTIMIZE__ && __OPTIMIZE__ > 0) ? 2 : 0)");
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+
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/* Misc. */
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if (flag_gnu89_inline)
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cpp_define (pfile, "__GNUC_GNU_INLINE__");
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--- a/gcc/doc/gcc.info
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+++ b/gcc/doc/gcc.info
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@@ -6255,6 +6255,11 @@ find out the exact set of optimizations that are enabled at each level.
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Please note the warning under '-fgcse' about invoking '-O2' on
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programs that use computed gotos.
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+ NOTE: In Gentoo, `-D_FORTIFY_SOURCE=2' is set by default, and is
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+ activated when `-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 `-U_FORTIFY_SOURCE' or `-D_FORTIFY_SOURCE=0'.
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+
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'-O3'
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Optimize yet more. '-O3' turns on all optimizations specified by
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'-O2' and also turns on the '-finline-functions',
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