[cmake-developers] Emit link commands to file?

[Dave Gittins]

Enabling CMAKE_EXPORT_COMPILE_COMMANDS causes CMake to emit
compile_commands.json, to be picked up by llvm tools or other custom stuff.
This is very useful.

Can we also have a link_commands.json that records the link commands that
produce each target? That would allow a whole new set of validation to be
performed on the structure of the build and the linking arrangements.

I am trying to perform some of those validations on some large CMake
projects but it's hard at the moment - I either have to try to explore the
situation within CMake, or parse the generated build files, or parse the
verbose build output - none of which is working very well!

I am willing to try implementing this feature myself, if it's considered
potentially useful and doesn't overlap with ongoing work or something.

Any thoughts?

Dave
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