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meson: do not use set10

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Make all items of config-host.h consistent.  To keep the --disable-coroutine-pool
code visible to the compiler, mutuate the IS_ENABLED() macro from Linux.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-10-05 14:31:27 +02:00
parent 9bad39c7e8
commit 230f6e06b8
4 changed files with 19 additions and 4 deletions
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15
include/qemu/compiler.h
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@ -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 */