[Qt-creator] clang code model for syntax highlighting does not work for standard header

[fgf]

Hi,

I try to use syntax highlighting with the clang code model. 
Unfortunately, the header of the standard library, for instance, 
<vector>, <string> etc. are not recognized.

For example, in this simple file sin, cout, namespace std, endl are not 
recognized. The file itself compiles ok.

---------------------------------------

#include <QCoreApplication>
#include <vector>
#include <cmath>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
     QCoreApplication a(argc, argv);

     double x = sin(1.0);
     cout << x << endl;

     return a.exec();
}
-----------------------------------------

There is a warning that the code model could not parse an included file. 
Partly, it is possible to fix this by adding explicit include 
statementsto the *.pro-file, but even then I run into problems in more 
complex cases (for instance for <string> header), which requires the 
addition of additional path'. Furthermore, it is not desirable to add 
absolute path names to *.pro-file.

-----------------------------------------

QT -= gui
CONFIG += console
CONFIG -= app_bundle
INCLUDEPATH += /usr/include/c++/7.1.1
INCLUDEPATH += /usr/include/c++/7.1.1/x86_64-pc-linux-gnu
QMAKE_CXXFLAGS += -std=c++14
SOURCES += main.cpp

-------------------------------------------

These observations suggests that clang does not know the path of the 
standard headers. Is there a way to circumvent this problem in a more 
elegant way? Is there are simple way to provide the clang plugin with 
the correct path?

i use Qt Creator 4.3.1 in Manjaro Linux with GCC 7.1.1.  A late snapshot 
of the beta of 4.4 has a similar problem.