https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112963
--- Comment #11 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #10) > BTW, yet another option would be to just > LIBM= > case $host in > *-*-beos* | *-*-cegcc* | *-*-cygwin* | *-*-haiku* | *-*-pw32* | *-*-darwin*) > # These system don't have libm, or don't need it > ;; > *) > LIBM=-lm > ;; > esac > AC_SUBST([LIBM]) > i.e. copy&paste libtool AC_CHECK_LIBM without that AC_CHECK_LIB part (and > without *-ncr-sysv* entry which we don't support in GCC AFAIK), so something > in between using -lm unconditionally and not using it on targets which don't > really need it. yes that seems a better solution - I was about to write: Seeing your comment #7, I think that the bare metal is a red herring (it just happened to be the reporter) - actually the issue is the unconditional GCC_NO_EXECUTABLES, which means that the macro would fail for any build != host case. I suppose also that means that build != host == target for mingw or other targets that do not use '-lm' will also be wrong - so a proper fix is needed sometime.
