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Introduce __warn_unused_type

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This is like __warn_unused, but it says that any time this type is
returned from a function it must be used. This will help enforce error
handling.
This commit is contained in:
ridiculousfish 2020-07-25 12:39:06 -07:00
parent e5cff1a2db
commit 364c6001dc
1 changed files with 12 additions and 0 deletions
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12
config_cmake.h.in
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@ -170,6 +170,7 @@
/* Define to 1 if mbrtowc attempts to convert invalid UTF-8 sequences */ /* Define to 1 if mbrtowc attempts to convert invalid UTF-8 sequences */
#cmakedefine HAVE_BROKEN_MBRTOWC_UTF8 1 #cmakedefine HAVE_BROKEN_MBRTOWC_UTF8 1
/* Support __warn_unused on function return values. */
#if __GNUC__ >= 3 #if __GNUC__ >= 3
#ifndef __warn_unused #ifndef __warn_unused
#define __warn_unused __attribute__ ((warn_unused_result)) #define __warn_unused __attribute__ ((warn_unused_result))
@ -177,3 +178,14 @@
#else #else
#define __warn_unused #define __warn_unused
#endif #endif
/* Like __warn_unused, but applies to a type.
At the moment only clang supports this as a type attribute.
*/
#if defined(__clang__) && __has_attribute(warn_unused_result)
#ifndef __warn_unused_type
#define __warn_unused_type __attribute__ ((warn_unused_result))
#endif
#else
#define __warn_unused_type
#endif