Josh Triplett
josh@joshtriplett.org
Doesn't matter if it uses graphviz or something else; I'm just looking for a DAG visualization. I'd also be happy with something that turns it into a data structure I can introspect, so I can ask questions like "what's the deepest branch".
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Josh Triplett
josh@joshtriplett.org
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AndresFreundTec
AndresFreundTec@mastodon.social@josh You want to do this for a specific invocation of a makefile, or statically?
The latter seems quite hard to do reliably, even if you assume limited logic triggering the recursion.
If the former, the infrastructure for tools like https://github.com/rizsotto/Bear or scan-build could be helpful?
Depending on what dependencies you're looking for, it could also be worth to look at compiler/linker generated dynamic dependencies.
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AndresFreundTec
AndresFreundTec@mastodon.social@josh Similar to the longstanding support in compilers (via -M -MP) linkers recently-ish got support for emitting those dependencies via --dependency-file=.
Of course using just the generated dependencies will often miss a lot of dependencies just in the makefile...
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AndresFreundTec
AndresFreundTec@mastodon.social@josh On second thought, depending on the build definition, just using make -s -p might do the trick, with a bit of parsing of the output? Dealing with targets that print output even with -s could be a bit annoying.
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Josh Triplett
josh@joshtriplett.org
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If I really had to do this. I would simply create a fake cross compile toolchain let's say CROSS_COMPILE=" dot-linux-". For all tools I would implement either take no other action but returns success but those relevant to the graph I'd update the dot file.
That is at least universal across toolchains (GCC, LLVM) and requires zero changes to the makefiles, and you'd only had to implement it once.
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