https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109818
--- Comment #30 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:49f59826c66bcaa3531429381b4aed944c332e5b commit r14-1454-g49f59826c66bcaa3531429381b4aed944c332e5b Author: Jonathan Wakely <jwak...@redhat.com> Date: Wed May 31 12:22:06 2023 +0100 libstdc++: Add separate autoconf macro for std::float_t and std::double_t [PR109818] This should make it possible to use openlibm with djgpp (and other targets with missing C99 <math.h> functions). The <math.h> from openlibm provides all the functions, but not the float_t and double_t typedefs. By separating the autoconf checks for the functionsand the typedefs, we don't disable support for all the functions just because those typedefs are not present. libstdc++-v3/ChangeLog: PR libstdc++/109818 * acinclude.m4 (GLIBCXX_ENABLE_C99): Add separate check for float_t and double_t and define HAVE_C99_FLT_EVAL_TYPES. * config.h.in: Regenerate. * configure: Regenerate. * include/c_global/cmath (float_t, double_t): Guard using new _GLIBCXX_HAVE_C99_FLT_EVAL_TYPES macro.
