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atomic: Fix type error with clang++

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clang++ checks the 2nd args of __atomic_compare_exchange_n() has the
same type as the first, which fails when 2nd arg is nullptr which is of
type nullptr_t.

Ideally it should do `glib_typeof (*(atomic)) gapcae_oldval = (oldval);`
to ensure oldval and atomic have compatible types but unfortunately that
does not work neither.

Since that function never has been typesafe, and it is not even
attempting to use glib_typeof in case __ATOMIC_SEQ_CST is not defined,
drop it in __atomic_ case too.

Fixes issue #2226.
This commit is contained in:
Xavier Claessens 2020-10-16 08:24:16 -04:00
parent 51003d409b
commit d95885d91e
1 changed files with 0 additions and 12 deletions
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12
glib/gatomic.h
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@ -182,17 +182,6 @@ G_END_DECLS
(void) (0 ? *(atomic) ^ (val) : 1); \
(guint) __atomic_fetch_xor ((atomic), (val), __ATOMIC_SEQ_CST); \
}))
#if defined(glib_typeof)
#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof (oldval) == sizeof (gpointer)); \
glib_typeof ((oldval)) gapcae_oldval = (oldval); \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
__atomic_compare_exchange_n ((atomic), &gapcae_oldval, (newval), FALSE, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? TRUE : FALSE; \
}))
#else /* if !defined(glib_typeof) */
#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof (oldval) == sizeof (gpointer)); \
@ -201,7 +190,6 @@ G_END_DECLS
(void) (0 ? (gpointer) *(atomic) : NULL); \
__atomic_compare_exchange_n ((atomic), &gapcae_oldval, (newval), FALSE, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? TRUE : FALSE; \
}))
#endif /* defined(glib_typeof) */
#define g_atomic_pointer_add(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \