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| author | Paolo Bonzini <pbonzini@redhat.com> | 2012-11-02 15:43:20 +0100 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2012-11-02 13:07:54 -0500 |
| commit | 1f001dc7bc9e435bf231a5b0edcad1c7c2bd6214 (patch) | |
| tree | 531f1ce25757189d2ac450a42f8eea75cf50e6fb /compiler.h | |
| parent | 2a0dfd004d9fae4adf2ccfcb2e3b1a76906b48a0 (diff) | |
| download | focaccia-qemu-1f001dc7bc9e435bf231a5b0edcad1c7c2bd6214.tar.gz focaccia-qemu-1f001dc7bc9e435bf231a5b0edcad1c7c2bd6214.zip | |
compiler: support Darwin weak references
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>
Diffstat (limited to 'compiler.h')
| -rw-r--r-- | compiler.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/compiler.h b/compiler.h index 58865d65e8..55d7d74775 100644 --- a/compiler.h +++ b/compiler.h @@ -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) |