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How can I query the default include path of clang/clang++? I am trying to use a custom built clang compiler (the one that supports OpenMP), but it doesn't seem to find the STL libraries:
/usr/local/bin/clang++ hello.cpp hello.cpp:1:10: fatal error: 'iostream' file not found #include <iostream> ^ 1 error generated. By using an IDE, back-tracking the #include iostream, and finally using the -isystem option I got the simple helloworld application to compile in OSX 10.9:
/usr/local/bin/clang++ -isystem /Library/Developer/CommandLineTools/usr/lib/c++/v1 hello.cpp Thanks for your help!
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You need to use the which command to locate c compiler binary called gcc. Usually, it is installed in /usr/bin directory.
System include paths are standard locations to find source code tags, such as the header files in /usr/include and its subdirectories on Unix-like operating systems. You can add and remove system include paths using the following commands: Command: semantic-add-system-include dir &optional mode ¶
The -cc1 argument indicates that the compiler front-end is to be used, and not the driver. The clang -cc1 functionality implements the core compiler functionality. So, simply speaking. If you do not give -cc1 then you can expect the "look&feel" of standard GCC.
Some header files ( stddef. h , stdarg. h , and others) are shipped with Clang — these are called builtin includes. Clang searches for them in a directory relative to the location of the clang binary.
You are looking for option -v. Compiling with clang++ -c file.cc -v will print among other things:
#include "..." search starts here: #include <...> search starts here: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9 etc.
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If you run
clang++ -### hello.cpp It will display the commands used to compile that particular file, including the default include paths, library search paths, targets etc.
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