Hi,
I've been tinkering a bit with a personal GCC12 build patched to use libc++ by
default, and now find myself unable to build against libstdc++.
`configure.cxxflags-append -stdlib=libstdc++` appears to be filtered out
somewhere in the "base" bowels, and `configure.cxx_stdlib libstdc++` appears
not to have any effect either. I'm not seeing any warnings in the logfile,
which is surprising (and rather bad practise IMHO).
What am I missing here, and what backdoor(s) could I use? I notice that
CXXFLAGS (aka Env(CXXFLAGS)) isn't yet set in `pre-configure`; I haven't yet
checked if "base" preserves its settings when initialising it (have been
assuming it won't). With autoconf-based projects one can set `configure.cxx
${configure.cxx} -stdlib=libstdc++` but that doesn't fly for cmake-based
projects...
Thanks,
R.
