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-fno-rtti in breaks building go? (older g++, -disable-bootstrap)

/src/gcc-4.7.0/configure -disable-bootstrap -enable-languages=go

book2:gccgo-4.7 jay$ g++ -v
Using built-in specs.
Target: i686-apple-darwin9
Configured with: /var/tmp/gcc/gcc-5493~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin9 --with-arch=apple --with-tune=generic --host=i686-apple-darwin9 --target=i686-apple-darwin9
Thread model: posix
gcc version 4.0.1 (Apple Inc. build 5493)

a lot of:

/usr/include/c++/4.0.0/tr1/functional_iterate.h:912: error: cannot use typeid with -fno-rtti
/src/gcc-4.7.0/gcc/go/gofrontend/string-dump.h: At global scope:


# Disable exceptions and RTTI if building with g++
?? ?m4_quote(m4_do([-fno-exceptions -fno-rtti])), [noexception_flags])

Maybe best to just leave the default flags? Maybe just remove this snippet?
Or maybe this is
?- meant for otherwise C code? Slightly optimize it??
?- meant to reduce memory/disk use and let things work that otherwise fail?
? i.e. on older hosts and/or with older g++?
Yeah yeah, I'll try without -disable-bootstrap.
If that fails though, I'll try removing those lines from configure/

Thank you,
? - Jay

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