`<cmath>`: Support `/Zc:cmath` downlevel - #6425

Merged

Stephan T. Lavavej (StephanTLavavej) merged 3 commits into

microsoft:mainfrom

StephanTLavavej:downlevel-cmath

Sep 3, 2026

Commits on Aug 31, 2026

cmath: Use builtins for MSVC /Zc:cmath in all Standard modes, not just C++23.
Stephan T. Lavavej (StephanTLavavej)
committed
21c1255
P0533R9_constexpr_for_cmath_and_cstdlib/test.cpp: Update to work in all Standard modes.
Stephan T. Lavavej (StephanTLavavej)
committed
99ceb88
P0533R9_constexpr_for_cmath_and_cstdlib/env.lst: Expand test matrix downlevel.
Stephan T. Lavavej (StephanTLavavej)
committed
8a5a918