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bsd-user: Disable clang warnings

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Implement PRAGMA_DISABLE_PACKED_WARNING and
PRAGMA_REENABLE_PACKED_WARNING macros in include/qemu/compiler.h.

Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
This commit is contained in:
Kyle Evans 2023-08-13 10:41:23 +02:00 committed by Warner Losh
parent 25e2cfbb8e
commit 15b950ecd1
1 changed files with 30 additions and 0 deletions
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30
include/qemu/compiler.h
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@ -22,6 +22,36 @@
#define QEMU_EXTERN_C extern
#endif
/*
* Tricky points:
* - Use __builtin_choose_expr to avoid type promotion from ?:,
* - Invalid sizes result in a compile time error stemming from
* the fact that abort has no parameters.
* - It's easier to use the endian-specific unaligned load/store
* functions than host-endian unaligned load/store plus tswapN.
* - The pragmas are necessary only to silence a clang false-positive
* warning: see https://bugs.llvm.org/show_bug.cgi?id=39113 .
* - We have to disable -Wpragmas warnings to avoid a complaint about
* an unknown warning type from older compilers that don't know about
* -Waddress-of-packed-member.
* - gcc has bugs in its _Pragma() support in some versions, eg
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83256 -- so we only
* include the warning-suppression pragmas for clang
*/
#ifdef __clang__
#define PRAGMA_DISABLE_PACKED_WARNING \
_Pragma("GCC diagnostic push"); \
_Pragma("GCC diagnostic ignored \"-Wpragmas\""); \
_Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"")
#define PRAGMA_REENABLE_PACKED_WARNING \
_Pragma("GCC diagnostic pop")
#else
#define PRAGMA_DISABLE_PACKED_WARNING
#define PRAGMA_REENABLE_PACKED_WARNING
#endif
#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__))
# define QEMU_PACKED __attribute__((gcc_struct, packed))
#else