Enabling RTTI for clang tool?

Question

I'm experimenting with clang's libTooling to build a basic source-to-source transformation tool.

I want to use boost::regex and boost::filesystem, but linking against them requires exceptions and RTTI be enabled. According to the clang mailing list , it should be possible to enable RTTI without breaking anything.

That said, I can't find a setting or variable to instruct the build system to enable RTTI. (i'm using cmake). I can add the -frtti and -fexceptions flags to the compiler commands, but the clang build system is adding its own -fno-rtti, -fno-exceptions flags which seem to have higher priority.

Answer 1

The relevant variables are called LLVM_ENABLE_RTTI and LLVM_ENABLE_EH.

They can can be set either by using a cmake gui like ccmake or cmake-gui, or by passing them directly to the cmake invocation.