makefiles: Rust fixes and info extensions #18630
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As for why the `-e` is being removed, observe that the `-e` would otherwise be printed; there is an [elaborate treatise] on what happens there. [elaborate treatise]: https://unix.stackexchange.com/questions/700675/why-is-echo-e-behaving-weird-in-a-makefile
Back in 36a029c, rather than being line wrapped, this was duplicated.
chrysn
added
Area: build system
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Contribution description
Getting information on which precise Rust version is used can be hard, because it is influenced by variables set in the build process, which were previously not accessible.
This is
make info-rust,make info-build,info-build, andTesting procedure
make info-buildandmake info-rust.make -C examples/rust-gcoap info-build, and look at how CFLAGS crashed before and now doesn't.Issues/PRs references
It'd be great to get this in fast to use it in finding out why RIOT-OS/rust-riot-wrappers#14 fails.
Asking @maribu for a review because if one of the things I'm just debugging hits #18619 (unlikely, but can't rule it out fast either), this would speed things up there.