https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90046
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- I can't even figure out how to configure for this target: checking stdbool.h usability... no checking stdbool.h presence... yes configure: WARNING: stdbool.h: present but cannot be compiled configure: WARNING: stdbool.h: check for missing prerequisite headers? configure: WARNING: stdbool.h: see the Autoconf documentation configure: WARNING: stdbool.h: section "Present But Cannot Be Compiled" configure: WARNING: stdbool.h: proceeding with the compiler's result checking for stdbool.h... no checking stdalign.h usability... no checking stdalign.h presence... yes configure: WARNING: stdalign.h: present but cannot be compiled configure: WARNING: stdalign.h: check for missing prerequisite headers? configure: WARNING: stdalign.h: see the Autoconf documentation configure: WARNING: stdalign.h: section "Present But Cannot Be Compiled" configure: WARNING: stdalign.h: proceeding with the compiler's result checking for stdalign.h... no checking for the value of EOF... configure: error: computing EOF failed make: *** [Makefile:10842: configure-target-libstdc++-v3] Error 1