https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86450
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> --- Because we haven't decided what the fix is. Something like this seems better than dealing with each warning one by one every time this happens: --- a/libstdc++-v3/acinclude.m4 +++ b/libstdc++-v3/acinclude.m4 @@ -144,7 +144,8 @@ AC_DEFUN([GLIBCXX_CHECK_COMPILER_FEATURES], [ if test x"$USE_MAINTAINER_MODE" = xno; then WERROR='' else - WERROR='-Werror' + # -Werror breaks the build too often, don't enable it. + WERROR='' fi # Check for -ffunction-sections -fdata-sections