I'm fairly clear on where SCons learns of the dependencies for source files: that is in the CScanner attached to the SourceFileScanner in T ool/__init__.py.
But where does SCons determine the dependencies of object files, such that those dependencies are checked to see if the object file needs to be rebuilt? More concretely, If I have libfoo.so made from foo.o made from foo.c which depends on foo.h, the CScanner in SourceScanner takes care of scanning for dependences in foo.c and finds foo.h. But what scans for dependences of foo.o and identifies foo.c? I ask because I would like to sometimes inject a new source-like dependency into compilations, such that foo.o will depend on not just foo.c but also some other file magic, such that if magic is changed then foo.o will need to be rebuilt. With such a mechanism, it would be possible to teach SCons that if an AddressSanitizer blacklist file known to be on the compile line like -fsanitize-blacklist=path/to/magic is referring to a blacklist file that is more up to date than the object file, then the object file should be rebuilt. Thanks, Andrew
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