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compiler: expression version of QEMU_BUILD_BUG_ON

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QEMU_BUILD_BUG_ON uses a typedef in order to be safe
to use outside functions, but sometimes it's useful
to have a version that can be used within an expression.
Following what Linux does, introduce QEMU_BUILD_BUG_ON_ZERO
that return zero after checking condition at build time.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2017-01-18 22:05:15 +02:00
parent f291887e8e
commit d757573e69
1 changed files with 3 additions and 0 deletions
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3
include/qemu/compiler.h
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@ -97,6 +97,9 @@
#define QEMU_BUILD_BUG_ON(x) #define QEMU_BUILD_BUG_ON(x)
#endif #endif
#define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - \
sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)))
#if defined __GNUC__ #if defined __GNUC__
# if !QEMU_GNUC_PREREQ(4, 4) # if !QEMU_GNUC_PREREQ(4, 4)
/* gcc versions before 4.4.x don't support gnu_printf, so use printf. */ /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */