As reported in https://bugs.ruby-lang.org/issues/21340, older autoconf have an AC_HEADER_STDBOOL that's incompatible with C23. Autoconf 2.72 fixed the macro, but also mentions that it's obsolescent since all current compilers have this header.
Since we require C99 1 and VS 2015 2, should be able take that suggestion and include stdbool.h without a check. This worked fine on rubyci.org.
Added by
Include stdbool.h without checking with autoconf
As reported in https://bugs.ruby-lang.org/issues/21340, older autoconf
have an AC_HEADER_STDBOOL that's incompatible with C23. Autoconf 2.72
fixed the macro, but also mentions that it's obsolescent since all
current compilers have this header.
Since we require C99 1 and VS 2015 2, should be able take
that suggestion and include stdbool.h without a check. This worked
fine on rubyci.org.
[Backport #21340]