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d548975423
We currently always store absolute filenames in coverage mapping. This is problematic for several reasons. It poses a problem for distributed compilation as source location might vary across machines. We are also duplicating the path prefix potentially wasting space. This change modifies how we store filenames in coverage mapping. Rather than absolute paths, it stores the compilation directory and file paths as given to the compiler, either relative or absolute. Later when reading the coverage mapping information, we recombine relative paths with the working directory. This approach is similar to handling ofDW_AT_comp_dir in DWARF. Finally, we also provide a new option, -fprofile-compilation-dir akin to -fdebug-compilation-dir which can be used to manually override the compilation directory which is useful in distributed compilation cases. Differential Revision: https://reviews.llvm.org/D95753
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