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base: fix ABSL_ATTRIBUTE_WARN_UNUSED with gcc <= 12 #2044

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base: fix ABSL_ATTRIBUTE_WARN_UNUSED with gcc <= 12 #2044

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7 changes: 7 additions & 0 deletions absl/base/attributes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1092,7 +1092,14 @@ struct AbslInternal_YouForgotToExplicitlyInitializeAField {
// See https://clang.llvm.org/docs/AttributeReference.html#warn-unused and
// https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html#index-warn_005funused-type-attribute
#if ABSL_HAVE_CPP_ATTRIBUTE(gnu::warn_unused)
// Only GCC >= 13 allows mixing standard and gnu attributes.
// In case of gcc < 13, fallback on using __attribute__.
// https://gcc.gnu.org/PR69585
#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 13
#define ABSL_ATTRIBUTE_WARN_UNUSED __attribute__((warn_unused))
#else
#define ABSL_ATTRIBUTE_WARN_UNUSED [[gnu::warn_unused]]
#endif
#else
#define ABSL_ATTRIBUTE_WARN_UNUSED
#endif
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