[cfe-dev] -O2 requires GLIBCXX_3.4.9?

[Tim Northover]

> So why can't I run it on a system with an older version of glibc?  This very
> confusing.  Clearly, -O2 wants a newer version of glibc.

There's a good chance you will be able to run it if you make the
dynamic loader use the glibc you were linking against. In your case it
looks like that's in /opt/gcc-4.4.6_install/lib so this might work:

$ LD_LIBRARY_PATH=/opt/gcc-4.4.6_install/lib ./my_program

Other than that you'll have to convince clang to use the libraries and
headers in /usr during compilation. Some combination of --sysroot and
-gcc-toolchain options has a good chance of working, but I'm not sure
how to bake that knowledge into clang at build-time (it probably
depends on whether you're using CMake or autotools).

Tim.