Clang

Clang is a C/C++/Objective C/CUDA compiler based on LLVM. The most recent iteration is distributed under the "Apache 2.0 License with LLVM exceptions".

Installation

Install the clang package.

Build packages with Clang

Add export CC=clang and (for C++) export CXX=clang++ to your /etc/makepkg.conf. If you are building with debug also remove -fvar-tracking-assignments from DEBUG_CFLAGS and DEBUG_CXXFLAGS as clang does not support it.

NB: For packages that specify GCC-specific build options, there may be build errors that require either editing the source package, the pkgbuild or commenting out the clang lines in makepkg.conf.

Using the Static Analyzer

To analyze a project, simply place the word scan-build in front of your build command. For example:

$ scan-build make

Tip: If your project is already compiled, scan-build won't rebuild and won't analyse it. To force recompilation and analysis, use -B switch:

$ scan-build make -B

It is also possible to analyze specific files:

$ scan-build gcc -c t1.c t2.c

See also

• Wikipedia:Clang
• scan-build: running the analyzer from the command line
• Compiling CUDA with clang