How can I make Clang's “scan-build” work with SCons?

Question

I've got a project built with SCons and I'm trying to use the Clang Static Analyzer to analyze the code. However, when running

scan-build scons

SCons seems to ignore the settings introduced by scan-build. How can I make this work?

Answer 1

The way scan-build works is it sets up various environment variables that are usually used by build systems (such as make) to control how the build happens. Some of these are:

• CC - name of program to use as C compiler
• CXX - name of program to use as C++ compiler
• CCC_* - various environment variables that control the behaviour of Clang's static analyzer

SCons normally cleans out the environment before running a build (this is a feature). In order to make the above environment variables take effect, do something like this in SConstruct:

env = Environment()
env["CC"] = os.getenv("CC") or env["CC"]
env["CXX"] = os.getenv("CXX") or env["CXX"]
env["ENV"].update(x for x in os.environ.items() if x[0].startswith("CCC_"))