https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113376
--- Comment #3 from Pilar Latiesa <pilarlatiesa at gmail dot com> --- It seems that what is missing is a corresponding change in the macro definition logic. It should have been changed to: // Check the user-defined macro for warnings #if defined(PSTL_USAGE_WARNINGS) # define _PSTL_USAGE_WARNINGS #endif See https://github.com/llvm/llvm-project/blob/5ccf19ded09f68bef43275c81c20b0e65f7c0b75/pstl/include/pstl/internal/pstl_config.h#L26
