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compiler: support Darwin weak references

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Weakrefs only tell you if the symbol was defined elsewhere, so you
need a further check at runtime to pick the default definition
when needed.

This could be automated by the compiler, but it does not do it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-02 15:43:20 +01:00 • committed by Anthony Liguori
parent 2a0dfd004d
commit 1f001dc7bc
5 changed files with 71 additions and 48 deletions
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9
compiler.h
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@ -50,8 +50,15 @@
# define __printf__ __gnu_printf__
# endif
# endif
# define QEMU_WEAK_ALIAS(newname, oldname) \
# if defined(__APPLE__)
# define QEMU_WEAK_ALIAS(newname, oldname) \
static typeof(oldname) weak_##newname __attribute__((unused, weakref(#oldname)))
# define QEMU_WEAK_REF(newname, oldname) (weak_##newname ? weak_##newname : oldname)
# else
# define QEMU_WEAK_ALIAS(newname, oldname) \
typeof(oldname) newname __attribute__((weak, alias (#oldname)))
# define QEMU_WEAK_REF(newname, oldname) newname
# endif
#else
#define GCC_ATTR /**/
#define GCC_FMT_ATTR(n, m)