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Fix __declspec support for ABSL_DECLARE_FLAG()

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Fix #1817

PiperOrigin-RevId: 813902689
Change-Id: Ic3508c02d5ed2e7dc220cdf02526680ae0adbbc1
This commit is contained in:
Corentin Le Molgat
2025-10-01 14:00:44 -07:00
committed by Copybara-Service
parent 76e395dcb1
commit efee2e57e9
1 changed files with 9 additions and 0 deletions
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9
absl/flags/declare.h
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@@ -59,10 +59,19 @@ ABSL_NAMESPACE_END
// Internal implementation of ABSL_DECLARE_FLAG to allow macro expansion of its
// arguments. Clients must use ABSL_DECLARE_FLAG instead.
//
// The non-MSVC implementation declares the flag twice. This is to allow
// applying attributes to the second declaration. However, this causes a
// compile error (C4273) in MSVC if a `__declspec` is prepended to the macro.
#if defined(_MSC_VER)
#define ABSL_DECLARE_FLAG_INTERNAL(type, name) \
extern absl::Flag<type> FLAGS_##name
#else
#define ABSL_DECLARE_FLAG_INTERNAL(type, name) \
extern absl::Flag<type> FLAGS_##name; \
namespace absl /* block flags in namespaces */ {} \
/* second redeclaration is to allow applying attributes */ \
extern absl::Flag<type> FLAGS_##name
#endif // _MSC_VER
#endif // ABSL_FLAGS_DECLARE_H_