Attached is a patch for automatical determination of c++ include paths.
CXX_INCLUDE_ROOT and CXX_INCLUDE_ARCH can be set manually or otherwise are determined from the host system.
It works by looking at /usr/include/c++ and using the latest revision.
Then it looks for a list of files in that directory like i486-linux-gnu and uses the first existing one.
This patch is for the cmake build system only.
It is aimed to replace he hardcoded paths in clang's lib/Frontend/InitHeaderSearch.cpp.
This patch is tested with Ubuntu 9.10. It correctly guesses /usr/include/c++/4.4.1 and i486-linux-gnu on my system. After that clang doesn't abort with "cannot find bits/c++config.h" anymore.
The list of directories only has 3 entries right now, it has to be expanded for all the other systems.
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0001-Automatically-determine-c-include-paths.patch (1.66 KB)