Support for extracting symbols graphs for clang targets#1390
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This approach generally makes sense to me
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Symbol graphs are not currently generated for clang targets. The reason is that SwiftPM
generally doesn't include headers in the PIF.
Support extracting symbol graphs for these targets via TAPI. Also, provide a method to
include project visible headers in the symbol graph generation so that SwiftPM can add
the headers with minimal disruption to the existing workflow.
SwiftPM also expects to be able to place the generated symbol graphs in a directory other
than the default so provide a build setting to specify the location.
Augment the TAPI symbol extractor to read the pretty print build setting and pass it along
to clang to format the JSON in the symbol graphs.