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[Corentin SCHREIBER <1432882@xxxxxxxxxxxxxxxxxx>]

This issue could be linked to this entry of the llvm libtooling FAQ:
http://clang.llvm.org/docs/LibTooling.html#libtooling-builtin-includes

Quoting:
"Clang tools need their builtin headers and search for them the same way Clang does. Thus, the default location to look for builtin headers is in a path $(dirname /path/to/tool)/../lib/clang/3.3/include relative to the tool binary. This works out-of-the-box for tools running from llvm’s toplevel binary directory after building clang-headers, or if the tool is running from the binary directory of a clang install next to the clang binary."

I guess this could explain the "../lib/clang/3.4" in libclang.

I have another machine running quantal, and on which I could install libclang1-3.3 and libclang1-3.4 from the llvm PPA (ppa:h-rayflood/llvm). Here too, the library search dirs start with the same "../lib/clang/", but these versions work perfectly. There must be something different in the way they are built, however from what I could gather this PPA is just taking the packages from Debian without modification:
http://http.debian.net/debian/pool/main/l/llvm-toolchain-3.4

I will try this approach in lucid, replacing the packages provided by
Ubuntu and report back.

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https://bugs.launchpad.net/bugs/1432882

Title:
  libclang1 has wrong standard include paths

Status in llvm-toolchain-3.4 package in Ubuntu:
  New

Bug description:
  Bug affects all versions of libclang1 I could test (3.3, 3.4 and 3.5).
  The precise version of libclang I have is 1:3.4-1ubuntu3.
  Running Ubuntu 14.04 (Linux Mint 17.1).

  When building a minimal libclang program (refgen.cpp, attached) and using the "-print-search-dirs" command line argument to output the standard header search directories, libclang outputs the following:
  programs: =:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../x86_64-linux-gnu/bin
  libraries: =../lib/clang/3.4:/usr/lib/gcc/x86_64-linux-gnu/4.8:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu:/lib/x86_64-linux-gnu:/lib/../lib64:/usr/lib/x86_64-linux-gnu:/usr/lib/gcc/x86_64-linux-gnu/4.8/../../..:/lib:/usr/lib

  Notice the leading "../lib/clang/3.4" in "libraries", which does not
  make any sense and is likely missing part of the path. Notice also the
  leading ":" in "programs", which probably doesn't hurt, but looks
  suspicious.

  For reference, running clang (3.4) with the same command line argument outputs:
  programs: =/usr/bin:/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../x86_64-linux-gnu/bin
  libraries: =/usr/bin/../lib/clang/3.4:/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8:/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu:/lib/x86_64-linux-gnu:/lib/../lib64:/usr/lib/x86_64-linux-gnu:/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../..:/lib:/usr/lib

  One can see here that the leading "/usr/bin/" has probably been
  stripped somehow from the "programs" and "libraries" search paths in
  libclang1.

  The end result is that libclang1 does not find clang's standard headers, and falls back to using GCC's, which it does not support.
  In my case, this means that if I try to parse even the simplest of files (test.cpp, attached) with this libclang1 and C++11 support enabled, the parsing fails because libclang1 is failing to understand GCC's SSE intrinsics in /usr/lib/gcc/x86_64-linux-gnu/4.8/include/ia32intrin.h, generating lots of errors:
  /usr/lib/gcc/x86_64-linux-gnu/4.8/include/ia32intrin.h:41:10: error: use of undeclared identifier '__builtin_ia32_bsrsi'
  /usr/lib/gcc/x86_64-linux-gnu/4.8/include/ia32intrin.h:89:10: error: use of undeclared identifier '__builtin_ia32_rdpmc'
  /usr/lib/gcc/x86_64-linux-gnu/4.8/include/ia32intrin.h:97:10: error: use of undeclared identifier '__builtin_ia32_rdtsc'
  /usr/lib/gcc/x86_64-linux-gnu/4.8/include/ia32intrin.h:105:10: error: use of undeclared identifier '__builtin_ia32_rdtscp'
  /usr/lib/gcc/x86_64-linux-gnu/4.8/include/ia32intrin.h:113:10: error: use of undeclared identifier '__builtin_ia32_rolqi'

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