Hello, This goes somewhere between a question and a feature request.
We are working on mull, https://github.com/mull-project/mull mutation testing system based on top of LLVM. Currently the development is mostly focused around testing of C++ projects and we use LLVM and its libraries as a playground. To run Mull against a library like LLVMCore or LLVMSupport, we need to compile the library, its tests and all of its dependencies to LLVM bitcode. Currently the best thing we can do to achieve this so far is to get a compilation database for a target and all of its dependencies using ninja and do some bash magic to patch the `clang ...` commands to produce a suite of *.bc files which Mull can then consume. We think that it would be great if CMake had a capability of generating LLVM bitcode targets out of existing targets with a support of incremental compilation so that one could iterate on development of a library and this kind of bitcode target would produce a set of *.bc files in a same way like add_library produces libraries. I have tried to clone the targets by hand using this script as a starting point: https://github.com/shadow/shadow/blob/master/cmake/LLVMTools.cmake#L40 but found that it was hard to create a clone of existing target to 100% match all of the compilation options of a source target. I could make it work for some of the LLVM targets but overall this approach seems to not be a solid one. So the following are questions that taken together might constitute a feature request: - Can it be possible to recursively clone existing library target created with add_library and all of its dependencies? - Modify this cloned target to produce a set of *.bc files instead of a binary. - Have this routine wrapped into a stable and portable CMake function like: add_llvm_bitcode_target? Thanks.
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