On Fri, 1 Nov 2024 at 21:34, Dass, Reena Collins via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > > I'm trying to build gcc 12.2 on RHEL 9. > How can I ensure GLIBCXX11_USE_C99_XXX class of macros are set to 1 in bits/c++config.h. When I build on RHEL 9 I get: #define _GLIBCXX11_USE_C99_COMPLEX 1 #define _GLIBCXX11_USE_C99_MATH 1 #define _GLIBCXX11_USE_C99_STDIO 1 #define _GLIBCXX11_USE_C99_STDLIB 1 #define _GLIBCXX11_USE_C99_WCHAR 1