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b16f765d6f
Summary: The linker wrapper is a utility used to create offloading programs from single-source offloading languages such as OpenMP or CUDA. This is done by embedding device code into the host object, then feeding it into the linker wrapper which extracts the accelerator object files, links them, then wraps them in registration code for the target runtime. This previously has only worked in Linux / ELF platforms. This patch attempts to hand Windows / COFF inputs by also accepting COFF forms of certain linker arguments we use internally. The important arguments are library search paths, so we can identify libraries which may contain device code, libraries themselves, and the output name used for intermediate output. I am not intimately familiar with the semantics here for the semantics in how a `lib` file is earched. I am simply treating `foo.lib` as the GNU equivalent `-l:foo.lib` in the search logic. Similarly, I am assuming that static libraries will be llvm-ar style libraries. I will need to investigate the actual deficiencies later, but this should be a good starting point along with https://github.com/llvm/llvm-project/pull/72697