Add support for serialized diagnostics, parseable output, and other
kinds of output from diagnostics engine to the libSwiftScan
replayCompilation API.
rdar://129015959
Teach scanner to respect the working directory set in the invocation
through scanner C API.
Also add test infrastructure to testing scanner from C API. Break up
DependencyScan lib into two so the swift-scan-test and remain small
without understanding swift AST.
rdar://127626011
`llvm::cl::ParseCommandLineOptions()` is not thread-safe to be called
from libSwiftScan so replaying multiple commands in parallel can crash
the build system. Since the replay instance is not used for compilation
and only need information from command-line arguments to create outputs
and diagnostics, ignore LLVMArgs when replaying.
rdar://120423882
Avoid path encoding difference (for example, real_path vs. path from
symlink) by eliminating the path from cache key. Cache key is now
encoded with the index of the input file from all the input files from
the command-line, reguardless if those inputs will produce output or
not. This is to ensure stable ordering even the batching is different.
Add a new cache computation API that is preferred for using input index
directly. Old API for cache key is deprecated but still updated to
fallback to real_path comparsion if needed.
As a result of swift scan API change, rename the feature in JSON file to
avoid version confusion between swift-driver and libSwiftScan.
rdar://119387650
Add new APIs libSwiftScan that can be used for cache query and cache
replay. This enables swift-driver or build system to query the cache and
replay the compilation results without invocation swift-frontend for
better scheduling.
