I'm trying to write a little build script, and want to determine if the includes are system includes or not. So I want g++ to tell me the include path's it's using.
cpp -v seems the obvious best shot, but it doesn't give me the C++ paths.
So I tried:
g++ -Xpreprocessor -v
Which doesn't work quite right - g++ captures the -v for it's own verbose output.
From Jonathan Wakely a better option (works on clang too):
g++ -E -x c++ - -v < /dev/null
clang++ -E -x c++ - -v < /dev/null
I noticed there's a flag in cpp for specifying language. This works like a charm.
cpp -xc++ -v < /dev/null
#include "..." search starts here:
#include <...> search starts here:
/usr/local/Cellar/gcc/4.7.0/gcc/lib/gcc/x86_64-apple-darwin11.4.0/4.7.0/../../../../include/c++/4.7.0
/usr/local/Cellar/gcc/4.7.0/gcc/lib/gcc/x86_64-apple-darwin11.4.0/4.7.0/../../../../include/c++/4.7.0/x86_64-apple-darwin11.4.0
/usr/local/Cellar/gcc/4.7.0/gcc/lib/gcc/x86_64-apple-darwin11.4.0/4.7.0/../../../../include/c++/4.7.0/backward
/usr/local/Cellar/gcc/4.7.0/gcc/lib/gcc/x86_64-apple-darwin11.4.0/4.7.0/include
/usr/local/include
/usr/local/Cellar/gcc/4.7.0/gcc/include
/usr/local/Cellar/gcc/4.7.0/gcc/lib/gcc/x86_64-apple-darwin11.4.0/4.7.0/include-fixed
/usr/include
/System/Library/Frameworks
/Library/Frameworks
End of search list.
Just noticed that it is important for the -x c++ to be -xc++ on gcc 4.2