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gmacros: Add new private g_has_typeof to abstract __typeof__ checks

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We have this same check in a few places now, and we might as well
abstract it out.

Fixes #1440.
This commit is contained in:
Iain Lane 2018-07-11 15:09:29 +01:00
parent f9a9902aac
commit 4c621fb7ee
4 changed files with 15 additions and 3 deletions
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12
glib/gmacros.h
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@ -110,6 +110,18 @@
#define G_GNUC_NULL_TERMINATED
#endif
/*
* We can only use __typeof__ on GCC >= 4.8, and not when compiling C++. Since
* __typeof__ is used in a few places in GLib, provide a pre-processor symbol
* to factor the check out from callers.
*
* This symbol is private.
*/
#undef g_has_typeof
#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && !defined(__cplusplus)
#define g_has_typeof
#endif
/*
* Clang feature detection: http://clang.llvm.org/docs/LanguageExtensions.html
* These are not available on GCC, but since the pre-processor doesn't do

2
glib/gmem.h
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@ -110,7 +110,7 @@ gpointer g_try_realloc_n (gpointer mem,
gsize n_blocks,
gsize n_block_bytes) G_GNUC_WARN_UNUSED_RESULT;
#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && !defined(__cplusplus) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_58
#if defined(g_has_typeof) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_58
#define g_clear_pointer(pp, destroy) \
G_STMT_START { \
G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer)); \

2
glib/grcbox.h
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@ -71,7 +71,7 @@ gsize g_atomic_rc_box_get_size (gpointer mem_block);
#define g_atomic_rc_box_new0(type) \
((type *) g_atomic_rc_box_alloc0 (sizeof (type)))
#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && !defined(_cplusplus)
#ifdef g_has_typeof
/* Type check to avoid assigning references to different types */
# define g_rc_box_acquire(mem_block) \
((__typeof__(mem_block)) (g_rc_box_acquire) (mem_block))

2
gobject/gobject.h
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@ -507,7 +507,7 @@ GLIB_AVAILABLE_IN_ALL
void g_object_remove_weak_pointer (GObject *object,
gpointer *weak_pointer_location);
#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && !defined(__cplusplus) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_56
#if defined(g_has_typeof) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_56
/* Make reference APIs type safe with macros */
#define g_object_ref(Obj) ((__typeof__(Obj)) (g_object_ref) (Obj))
#define g_object_ref_sink(Obj) ((__typeof__(Obj)) (g_object_ref_sink) (Obj))