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Enable _FORTIFY_SOURCE=3 for gcc 12 and above

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gcc 12 now has support for the __builtin_dynamic_object_size builtin.
Adapt the macro checks to enable _FORTIFY_SOURCE=3 on gcc 12 and above.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Siddhesh Poyarekar 2022-01-12 18:46:28 +05:30
parent 0005e54f76
commit 86bf0feb0e
2 changed files with 5 additions and 2 deletions
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4
include/features.h
View File

@ -412,7 +412,9 @@
# warning _FORTIFY_SOURCE requires compiling with optimization (-O)
# elif !__GNUC_PREREQ (4, 1)
# warning _FORTIFY_SOURCE requires GCC 4.1 or later
# elif _FORTIFY_SOURCE > 2 && __glibc_clang_prereq (9, 0)
# elif _FORTIFY_SOURCE > 2 && (__glibc_clang_prereq (9, 0) \
|| __GNUC_PREREQ (12, 0))
# if _FORTIFY_SOURCE > 3
# warning _FORTIFY_SOURCE > 3 is treated like 3 on this platform
# endif

3
misc/sys/cdefs.h
View File

@ -143,7 +143,8 @@
#define __bos0(ptr) __builtin_object_size (ptr, 0)
/* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */
#if __USE_FORTIFY_LEVEL == 3 && __glibc_clang_prereq (9, 0)
#if __USE_FORTIFY_LEVEL == 3 && (__glibc_clang_prereq (9, 0) \
|| __GNUC_PREREQ (12, 0))
# define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0)
# define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1)
#else