SOLVED! ![]()
Adding CFLAGS='-std=c17' to gmp.cfg before invoking the configure script does the trick.
%build
build_top=$(pwd)
cd gmp-%{gmp_version}
%{host_build_flags}
CFLAGS='-std=c17'
./configure \
--build=%{_build} --host=%{_host} \
--verbose \
--prefix=%{gmp_prefix} --bindir=%{gmp_bindir} \
--exec-prefix=%{gmp_exec_prefix} \
--includedir=%{gmp_includedir} --libdir=%{gmp_libdir} \
--mandir=%{gmp_mandir} --infodir=%{gmp_infodir} \
--disable-shared \
%{gmp_extra_options}
The tool suite is successfully building now.
Update:
Confirm mission accomplished.

