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...ompile function always testing a full compile then link operation. When >> bootstrapping a cross-compiler this will always fail because linking even the >> simplest applications fails when you don’t have libclang_rt prebuilt. > > In my case, I had to use the CMAKE_{C,CXX}_COMPILER_FORCED variables and > guestimate the appropriate C/C++ flags in order to avoid CMake getting in the > way with the various checks. My scripts build clang & lld, then install the > linux's kernel & Musl's C library headers and finally build compiler-rt's > builtins library...

In the effort to flesh out the CMake build system a problematic issue has come up, and I’d like some feedback on how to best handle it. For reference this issue has been reported by a few users, one proposed patches that don’t really address the underlying problem here: http://reviews.llvm.org/D13131 The problem comes when bootstrapping a cross-compiler toolchain. In order to have a