[oe] sane-toolchain-glibc.inc and old g++ versions

[Holger Schurig]

Upon thinking about that, it occured to me that you can do this 
without modifying bitbake: by using python code that modifies 
CXXFLAGS and an anonymous function.

For example, in any *.bb, *.inc, *.conf and *.bbclass file you 
can use anonmyous python functions like this:

SRCDATE=${@bb.data.getVar('PV', d, 1)[9:]}

And no one hinders you to do:

CXXFLAGS=${@bb.data.getVar('CXXFLAGS', d, 
1).replace(" -fvisibility-inlines-hidden",""))


That's pretty all untested, but I think it will work. One recipe 
that uses this trick is mesa/mesa_6.0.1.bb.