http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57220
--- Comment #6 from Kai Tietz <ktietz at gcc dot gnu.org> 2013-05-08 20:04:56 UTC --- Fine, by which date this version was built? I am pretty curious to see that issue for 4.9 due I don't happen to see it on my box. Could you check, if libmingwex.a contains for you the symbol in question? For me $ x86_64-w64-mingw32-nm.exe /usr/local/x86_64-w64-mingw32/lib/libmingwex.a | grep -e "__mingw_strtod" displays: 0000000000000000 T __mingw_strtod and shows symbol is present.