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Stub out __has_attribute if not defined

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Otherwise compilers that don't even have __has_attribute fail.

Fixes #7554
This commit is contained in:
Fabian Homborg 2020-12-16 17:06:48 +01:00
parent 1083cd2640
commit 8087f603ad
1 changed files with 6 additions and 0 deletions
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6
config_cmake.h.in
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@ -181,7 +181,13 @@
/* Like __warn_unused, but applies to a type.
At the moment only clang supports this as a type attribute.
We need to check for __has_attribute being a thing before or old gcc fails - #7554.
*/
#ifndef __has_attribute
#define __has_attribute(x) 0 // Compatibility with non-clang and old gcc compilers.
#endif
#if defined(__clang__) && __has_attribute(warn_unused_result)
#ifndef __warn_unused_type
#define __warn_unused_type __attribute__ ((warn_unused_result))