GitLab

	* acinclude.m4:  New macro, GLIBCPP_ENABLE_CXX_FLAGS.
	* configure.in:  Call.
	* src/Makefile.am:  Append results of macro to AC_CXXFLAGS.
	* aclocal.m4:  Regenerate.
	* configure:  Ditto.
	* src/Makefile.in:  Ditto.
	* docs/configopts.html:  Document.
	* docs/download.html:  Fix typo (close quote).
	* docs/footer.html:  Update.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@33805 138bc75d-0d04-0410-961f-82ee72b054a4