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| author | Michael S. Tsirkin | 2017-01-18 21:05:15 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin | 2017-02-01 02:37:17 +0100 |
| commit | d757573e69f2ef58a4a7b41f6c55d65fa1e1c5c2 (patch) | |
| tree | 78a7fbea6bd438d537ac6045f83a1077c42893cf /include | |
| parent | compiler: rework BUG_ON using a struct (diff) | |
| download | qemu-d757573e69f2ef58a4a7b41f6c55d65fa1e1c5c2.tar.gz qemu-d757573e69f2ef58a4a7b41f6c55d65fa1e1c5c2.tar.xz qemu-d757573e69f2ef58a4a7b41f6c55d65fa1e1c5c2.zip | |
compiler: expression version of QEMU_BUILD_BUG_ON
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/compiler.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 057639af43..e0ce9ffb28 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -97,6 +97,9 @@ #define QEMU_BUILD_BUG_ON(x) #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 !QEMU_GNUC_PREREQ(4, 4) /* gcc versions before 4.4.x don't support gnu_printf, so use printf. */ |