Clang code model produces half the time no highlighting

*** Highlighting from 1 to 126 of "/home/waechter/projects/testarea/ogdf-test/ogdf-test/main.cpp" 
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clang version 3.4 (http://llvm.org/git/clang.git a335ba031b18e2736120b5b82bfee08c50ec522c) (http://llvm.org/git/llvm.git dbb832b83351cec97b025b61c26536ef50c3181c)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../include/c++/4.7/x86_64-linux-gnu"
ignoring nonexistent directory "../lib/clang/3.4/include"
ignoring nonexistent directory "/include"
ignoring duplicate directory "/usr/include/c++/4.7"
  as it is a non-system directory that duplicates a system directory
ignoring duplicate directory "/usr/include/c++/4.7/backward"
  as it is a non-system directory that duplicates a system directory
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/4.7/."
  as it is a non-system directory that duplicates a system directory
ignoring duplicate directory "/usr/local/include"
  as it is a non-system directory that duplicates a system directory
ignoring duplicate directory "/usr/include/x86_64-linux-gnu"
  as it is a non-system directory that duplicates a system directory
ignoring duplicate directory "/usr/include"
  as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include
 /usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed
 /usr/include/qt4/QtCore
 /usr/include/qt4
 /home/waechter/libs/OGDF
 /home/waechter/projects/testarea/ogdf-test/build-ogdf-test-Qt_4_8_4_System-Debug
 /home/waechter/projects/testarea/ogdf-test/ogdf-test
 /usr/share/qt4/mkspecs/linux-g++-64
 /usr/share/qt4/mkspecs/linux-g++
 /usr/include/c++/4.7
 /usr/include/c++/4.7/backward
 /usr/include/x86_64-linux-gnu/c++/4.7/.
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
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"warning" "" [172:9(5508)] "'__FLT_MIN__' macro redefined
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"warning" "" [184:9(5959)] "'__DBL_DENORM_MIN__' macro redefined
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"warning" "" [195:9(6364)] "'__GNUC_PATCHLEVEL__' macro redefined
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"warning" "" [223:9(7244)] "'__FLT_EPSILON__' macro redefined
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"warning" "" [240:9(7747)] "'__DBL_MAX__' macro redefined
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"warning" "" [265:9(8620)] "'__DBL_MIN__' macro redefined
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"warning" "" [275:9(8938)] "'__VERSION__' macro redefined
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"warning" "" [289:9(9425)] "'__INT8_TYPE__' macro redefined
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"warning" "" [311:9(10269)] "'__CHAR16_TYPE__' macro redefined
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"warning" "" [318:9(10529)] "'__INT16_TYPE__' macro redefined
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"warning" "" [359:9(11844)] "'__DBL_EPSILON__' macro redefined
  previous definition is here" 
"warning" "" [371:9(12267)] "'__FLT_DENORM_MIN__' macro redefined
  previous definition is here" 
"warning" "" [375:9(12431)] "'__FLT_MAX__' macro redefined
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"warning" "" [381:9(12626)] "'__GNUC_MINOR__' macro redefined
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...
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"warning" "" [386:9(12837)] "'__FLT_MAX__' macro redefined
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"warning" "" [392:9(13032)] "'__GNUC_MINOR__' macro redefined
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"fatal" "/home/waechter/libs/OGDF/src/augmentation/DfsMakeBiconnected.cpp" [45:10(1417)] "'ogdf/augmentation/DfsMakeBiconnected.h' file not found" 
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