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

To change the default compiler for building packages, edit: 

/etc/makepkg.conf
...
export CC=clang
export CXX=clang++

For LTO support: install the lld package, then add -fuse-ld=lld to LDFLAGS in your /etc/makepkg.conf.

If you are building with debug, you also need to remove -fvar-tracking-assignments from DEBUG_CFLAGS and DEBUG_CXXFLAGS, as Clang does not support it.

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

If your project is already compiled, scan-build will not rebuild and will not analyse it. To force recompilation and analysis, use switch:

$ scan-build make -B

It is also possible to analyze specific files:

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

Tips and tricks

Bash completion

In order to enable Bash completion, install and source in a Bash startup file.

gollark: It's entirely reasonable, since the AP is for... guess what... free eggs.
gollark: Well, yes.
gollark: What if we're all just hallucinating the market?
gollark: It says "whether from the site".
gollark: ``` "Buying" Eggs/Hatchlings/DragonsThere are no official means through which eggs, hatchlings, or dragons can be bought, whether from the site or from other users. Exchanging any sort of currency, real or virtual, for eggs, hatchlings, or dragons is expressly forbidden.```

See also
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