tree 75be000069a77def2cec609036b0558caa0a22e9
parent 0275c9fa5fec375a4362e9f315dfba5284ad91f4
author Oleksandr T. <oleksandr.tarasiuk@outlook.com> 1768225805 +0200
committer GitHub <noreply@github.com> 1768225805 +0200
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[Clang] prevent an assertion failure caused by C++ constant expression checks in C23 floating conversions (#174113)

Fixes #173847

---

This patch addresses an assertion failure during compilation of C23 code
involving floating-point conversions.

As part of the C23 constexpr support introduced in PR #73099, Clang
began reusing parts of the C++ constant evaluation and narrowing logic.
In C23 mode, a failed constant evaluation caused the condition to
proceed to C++ constant-expression checks, resulting in an assertion
failure.

This change evaluates constants using `EvaluateAsRValue` in C23 mode and
restricts C++ constant-expression checks to C++ mode.