diff options
Diffstat (limited to 'include/qemu')
| -rw-r--r-- | include/qemu/compiler.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 1109482a00..c797f0d457 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -212,4 +212,19 @@ # define QEMU_USED #endif +/* + * Ugly CPP trick that is like "defined FOO", but also works in C + * code. Useful to replace #ifdef with "if" statements; assumes + * the symbol was defined with Meson's "config.set()", so it is empty + * if defined. + */ +#define IS_ENABLED(x) IS_EMPTY(x) + +#define IS_EMPTY_JUNK_ junk, +#define IS_EMPTY(value) IS_EMPTY_(IS_EMPTY_JUNK_##value) + +/* Expands to either SECOND_ARG(junk, 1, 0) or SECOND_ARG(IS_EMPTY_JUNK_CONFIG_FOO 1, 0) */ +#define SECOND_ARG(first, second, ...) second +#define IS_EMPTY_(junk_maybecomma) SECOND_ARG(junk_maybecomma 1, 0) + #endif /* COMPILER_H */ |