[PATCH] CMake: add LLVM_INSTALL_LIBRARIES variable

[Reid Kleckner]

  As discussed in person, let's go for a single option called LLVM_INSTALL_DEV_FILES (or DEV_RESOURCES or any other spelling).

  This would basically cover libs, headers, cmake files, tablegen, and anything that a *developer* would need to build code against this package, ie what would go in a Debian libfoo-dev package.

http://llvm-reviews.chandlerc.com/D1428