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[libc] Add support for __builtin_is_constant_evaluated for GCC 9+. #150322

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Merged
merged 1 commit into from
Jul 23, 2025
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[libc] Add support for __builtin_is_constant_evaluated for GCC 9+. #150322

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4 changes: 0 additions & 4 deletions libc/src/__support/CPP/type_traits/is_constant_evaluated.h
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Original file line number Diff line number Diff line change
Expand Up @@ -15,11 +15,7 @@ namespace LIBC_NAMESPACE_DECL {
namespace cpp {

LIBC_INLINE constexpr bool is_constant_evaluated() {
#if LIBC_HAS_BUILTIN(__builtin_is_constant_evaluated)
return __builtin_is_constant_evaluated();
#else
return false;
#endif
}

} // namespace cpp
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6 changes: 5 additions & 1 deletion libc/src/__support/RPC/rpc_server.h
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Expand Up @@ -15,13 +15,17 @@
#ifndef LLVM_LIBC_SRC___SUPPORT_RPC_RPC_SERVER_H
#define LLVM_LIBC_SRC___SUPPORT_RPC_RPC_SERVER_H

#include "src/__support/macros/properties/compiler.h"

// Workaround for missing __has_builtin in < GCC 10.
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif

// Workaround for missing __builtin_is_constant_evaluated in < GCC 10.
#ifndef __builtin_is_constant_evaluated
// Also this builtin is defined for GCC 9.
#if !(__has_builtin(__builtin_is_constant_evaluated) || \
(defined(LIBC_COMPILER_IS_GCC) && (LIBC_COMPILER_GCC_VER >= 900)))
#define __builtin_is_constant_evaluated(x) 0
#endif

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6 changes: 0 additions & 6 deletions libc/src/__support/macros/attributes.h
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Expand Up @@ -48,10 +48,4 @@
#define LIBC_PREFERED_TYPE(TYPE)
#endif

#ifndef __has_builtin
#define LIBC_HAS_BUILTIN(X) 0
#else
#define LIBC_HAS_BUILTIN(X) __has_builtin(X)
#endif

#endif // LLVM_LIBC_SRC___SUPPORT_MACROS_ATTRIBUTES_H
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