Bug#645731: clang uses gcc header files, but cannot handle some of them

[Gabriel Corona]

Hello,

I guess there is a problem with the include path.

Trying to compile a simple C++ file (using clang 3.0 in unstable) :

$ clang++ -v test.cpp
Debian clang version 3.0-1 (tags/RELEASE_30/final) (based on LLVM 3.0)
Target: i386-pc-linux-gnu
Thread model: posix
 "/usr/bin/clang" -cc1 -triple i386-pc-linux-gnu -emit-obj -mrelax-all
-disable-free -disable-llvm-verifier -main-file-name test.cpp
-mrelocation-model static -mdisable-fp-elim -masm-verbose
-mconstructor-aliases -target-cpu pentium4 -target-linker-version
2.21.90.20111025 -momit-leaf-frame-pointer -v -resource-dir
/usr/bin/../lib/clang/3.0 -fmodule-cache-path
/var/tmp/clang-module-cache -internal-isystem /usr/include/c++/4.6
-internal-isystem /usr/include/c++/4.6/i486-linux-gnu -internal-isystem
/usr/include/c++/4.6/backward -internal-isystem /usr/local/include
-internal-isystem /usr/bin/../lib/clang/3.0/include
-internal-externc-isystem /usr/include/i486-linux-gnu
-internal-externc-isystem /usr/include -fdeprecated-macro -ferror-limit
19 -fmessage-length 156 -fgnu-runtime -fobjc-runtime-has-arc
-fobjc-runtime-has-weak -fobjc-fragile-abi -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o /tmp/test-FtMXsE.o -x
c++ test.cpp
clang -cc1 version 3.0 based upon llvm 3.0 hosted on i386-pc-linux-gnu
ignoring nonexistent directory "/usr/bin/../lib/clang/3.0/include"
ignoring nonexistent directory "/usr/include/i486-linux-gnu"
ignoring nonexistent directory "/usr/include/c++/4.6//i486-linux-gnu/32"
ignoring nonexistent directory "/usr/include/i486-linux-gnu/"
ignoring nonexistent directory "/usr/bin/../lib/clang/3.0/include"
ignoring nonexistent directory "/usr/include/i486-linux-gnu"
ignoring duplicate directory "/usr/include/c++/4.6"
ignoring duplicate directory "/usr/include/c++/4.6/i486-linux-gnu"
ignoring duplicate directory "/usr/include/c++/4.6/backward"
ignoring duplicate directory "/usr/include/c++/4.6"
ignoring duplicate directory "/usr/include/c++/4.6/backward"
ignoring duplicate directory "/usr/include/c++/4.6"
ignoring duplicate directory "/usr/include/c++/4.6/i486-linux-gnu"
ignoring duplicate directory "/usr/include/c++/4.6/backward"
ignoring duplicate directory "/usr/local/include"
ignoring duplicate directory "/usr/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.6
 /usr/include/c++/4.6/i486-linux-gnu
 /usr/include/c++/4.6/backward
 /usr/local/include
 /usr/include
 /usr/lib/gcc/i486-linux-gnu/4.6/include/
 /usr/lib/gcc/i486-linux-gnu/4.6/include-fixed/
End of search list.
In file included from test.cpp:1:
In file included from /usr/include/stdio.h:28:
/usr/include/features.h:323:10: fatal error: 'bits/predefs.h' file not found
#include <bits/predefs.h>
         ^
1 error generated.

Notice :

* /usr/bin/../lib/clang/3.0/include, does not exist.
Instead, I have /usr/include/clang/3.0/include.
It contains emmintrin.h and friends working with clang.
I guess they should be used instead of the GCC ones.
They are in the libclang-dev however which is not required by the clang
package,
it probably should.

* /usr/include/i486-linux-gnu does not exist.
Instead, I have /usr/include/i386-linux-gnu.

Now compiling with :

$ clang++ -c test.cpp -I /usr/include/clang/3.0/include -I
/usr/include/i386-linux-gnu

Working!

-- 
Gabriel