[cfe-dev] [PATCH] header search

[mike-m]

Find attached patch which fixes <cstddef> issue on some linux distros and adds
yet more C++ search dirs for various linux distros. Details follow.

1)
  Updated C++ include header search paths for various Debian/Ubuntu and Fedora
  linux distros. The main changes are static ordering of directories to check
  for GNU c++ includes:

        - newer versions of libstdc++ are checked for first
        - distros listing is reverse chronological order
        - more clear that N-distros need the same dir check

  Tracking for the following new distros has been added; unless otherwise noted,
  all adds have been validated to not break things by building clang selfhost:

        - Ubuntu 10.04 LTS 64-bit, 32-bit
        - Ubuntu 9.10 32-bit
        - Ubuntu 9.04 64-bit
        - Ubuntu 8.10 64-bit
        - Ubuntu 8.04 LTS 64-bit, 32-bit

        - Debian 6.0 64-bit, 32-bit
        - Debian 5.0 64-bit, 32-bit

        - Fedora 9 64-bit (untested but paths checked with distro rpms)
        - Fedora 8 64-bit (untested but paths checked with distro rpms)

2)
  Moved clang-builtin include dir position to immediately precede /usr/include,
  matching gcc compiler. Fixes #include_next shenanigans that lead to failures
  when clang++ is used to compile source with <cstddef>. libstdc++ versions
  4.3.0, 4.3.1 and 4.3.2 are at issue, which ship bundled on Debian 5.04,
  Ubuntu 8.10 and Fedora 10. Example error from Ubuntu 8.10:

  > /usr/include/c++/4.3/cstddef:47:15: fatal error: 'stddef.h' file not found
  > #include_next <stddef.h>
  >               ^
  > 1 error generated.


================================================================================
Comparison of <...> search dirs on ubuntu 8.10:
[note: '*' marks repositioned include dir]

unpatched clang++:
  /home/mike/work/llvm/ubuntu/out.debug/Debug/lib/clang/2.0/include
  /usr/include/c++/4.3
  /usr/include/c++/4.3/x86_64-linux-gnu
  /usr/include/c++/4.3/backward
  /usr/local/include
  /usr/include

patched clang++:
  /usr/include/c++/4.3
  /usr/include/c++/4.3/x86_64-linux-gnu
  /usr/include/c++/4.3/backward
  /usr/local/include
* /home/mike/work/llvm/ubuntu/out.debug/Debug/lib/clang/2.0/include
  /usr/include

g++:
  /usr/include/c++/4.3
  /usr/include/c++/4.3/x86_64-linux-gnu
  /usr/include/c++/4.3/backward
  /usr/local/include
  /usr/lib/gcc/x86_64-linux-gnu/4.3.2/include
  /usr/lib/gcc/x86_64-linux-gnu/4.3.2/include-fixed
  /usr/include

================================================================================
Comparison of <...> search dirs on darwin 10.3.0:
[note: '*' marks repositioned include dir]

unpatched clang++:
  /tank1/work/llvm/ubuntu/out.debug/Debug/lib/clang/2.0/include
  /usr/include/c++/4.2.1
  /usr/include/c++/4.2.1/i686-apple-darwin10/x86_64
  /usr/include/c++/4.2.1/backward
  /usr/include/c++/4.0.0
  /usr/include/c++/4.0.0/i686-apple-darwin8
  /usr/include/c++/4.0.0/backward
  /usr/local/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)

patched clang++:
  /usr/include/c++/4.2.1
  /usr/include/c++/4.2.1/i686-apple-darwin10/x86_64
  /usr/include/c++/4.2.1/backward
  /usr/include/c++/4.0.0
  /usr/include/c++/4.0.0/i686-apple-darwin8
  /usr/include/c++/4.0.0/backward
  /usr/local/include
* /tank1/work/llvm/ubuntu/out.debug/Debug/lib/clang/2.0/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)

g++:
  /usr/include/c++/4.2.1
  /usr/include/c++/4.2.1/i686-apple-darwin10/x86_64
  /usr/include/c++/4.2.1/backward
  /usr/local/include
  /usr/lib/gcc/i686-apple-darwin10/4.2.1/include
  /usr/include
  /System/Library/Frameworks (framework directory)
  /Library/Frameworks (framework directory)


--mike-m
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