Difference between revisions of "Clang"

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(Remove sentence with clang-analyze pkg, because it is no longer nececary, this tool is built in clang pkg.)
(Build packages with Clang: Add note to remove -fvar-tracking-assignments from DEBUG_CFLAGS as it is not supported by clang)
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== Build packages with Clang ==
 
== Build packages with Clang ==
Add {{ic|1=export CC=clang}} and (for C++) {{ic|1=export CXX=clang++}} to your {{ic|/etc/makepkg.conf}}.
+
Add {{ic|1=export CC=clang}} and (for C++) {{ic|1=export CXX=clang++}} to your {{ic|/etc/makepkg.conf}}. If you are building with {{ic|debug}} also remove {{ic|-fvar-tracking-assignments}} from {{ic|DEBUG_CFLAGS}} and {{ic|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.
 
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.

Revision as of 07:01, 6 March 2017

Clang is a C/C++/Objective C compiler based on LLVM. It is distributed under the BSD Licence.

Installation

Install clang from the Official repositories.

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

References