26 lines
956 B
C++
26 lines
956 B
C++
//===--- AlwaysTrue.h - Helper for oqaque truthy values --*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ALWAYS_TRUE_H
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#define LLVM_SUPPORT_ALWAYS_TRUE_H
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#include <cstdlib>
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namespace llvm {
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inline bool getNonFoldableAlwaysTrue() {
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// Some parts of the codebase require a "constant true value" used as a
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// predicate. These cases require that even with LTO and static linking,
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// it's not possible for the compiler to fold the value. As compilers
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// aren't smart enough to know that getenv() never returns -1, this will do
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// the job.
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return std::getenv("LLVM_IGNORED_ENV_VAR") != (char *)-1;
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}
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} // end namespace llvm
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#endif // LLVM_SUPPORT_ALWAYS_TRUE_H
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