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headers: Clarify a few aspects relating to Clang wrt the fortification macros

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There's no problem in using the "artificial" attribute with Clang,
at least as of Clang 10.0.

Clarify why Clang is excluded for __MINGW_FORTIFY_VA_ARG.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2022-10-31 13:19:05 +02:00
parent 19aa419bb9
commit 22a065d89f
1 changed files with 3 additions and 2 deletions
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5
mingw-w64-headers/crt/_mingw_mac.h
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@ -294,7 +294,7 @@
# define __mingw_static_ovr __mingw_ovr
#endif /* __cplusplus */
#if __MINGW_GNUC_PREREQ(4, 3) && !defined(__clang__)
#if __MINGW_GNUC_PREREQ(4, 3) || defined(__clang__)
# define __mingw_attribute_artificial \
__attribute__((__artificial__))
#else
@ -345,7 +345,8 @@
/* If _FORTIFY_SOURCE is enabled, some inline functions may use
__builtin_va_arg_pack(). GCC may report an error if the address
of such a function is used. Set _FORTIFY_VA_ARG=0 in this case. */
of such a function is used. Set _FORTIFY_VA_ARG=0 in this case.
Clang doesn't, as of version 15, yet implement __builtin_va_arg_pack(). */
#if __MINGW_FORTIFY_LEVEL > 0 && __MINGW_GNUC_PREREQ(4, 3) && !defined(__clang__) \
&& (!defined(_FORTIFY_VA_ARG) || _FORTIFY_VA_ARG > 0)
# define __MINGW_FORTIFY_VA_ARG 1