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qemu/compiler: Split out qemu_build_not_reached_always 

Provide a symbol that can always be used to signal an error,
regardless of optimization.  Usage of this should be protected
by e.g. __builtin_constant_p, which guards for optimization.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-01-14 10:04:04 -10:00
parent bfff072c50
commit c52ea111e0
1 changed files with 3 additions and 2 deletions
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5
include/qemu/compiler.h
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@ -215,9 +215,10 @@
* supports QEMU_ERROR, this will be reported at compile time; otherwise
* this will be reported at link time due to the missing symbol.
*/
#if defined(__OPTIMIZE__) && !defined(__NO_INLINE__)
extern void QEMU_NORETURN QEMU_ERROR("code path is reachable")
qemu_build_not_reached(void);
qemu_build_not_reached_always(void);
#if defined(__OPTIMIZE__) && !defined(__NO_INLINE__)
#define qemu_build_not_reached() qemu_build_not_reached_always()
#else
#define qemu_build_not_reached() g_assert_not_reached()
#endif