Latest release of cortex-m-semihosting seems broken?

[korken89]

After the 0.4.0 update of cortex-m-semihosting we are seeing breakage in RTIC CI pipeline as follows:

error: failed to run custom build command for `cortex-m-semihosting v0.4.0`

Caused by:
  process didn't exit successfully: `/home/emifre/Git/rtic/cortex-m-rtic/target/debug/build/cortex-m-semihosting-6c5d0dd3173d1553/build-script-build` (exit code: 101)
  --- stderr
  thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', /home/emifre/.cargo/registry/src/github.com-1ecc6299db9ec823/cortex-m-semihosting-0.4.0/build.rs:15:14
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...
error: build failed

No idea what is actually wrong here, but it seems something broke in the latest release?

[jamesmunns]

Relevant build script code:

https://github.com/rust-embedded/cortex-m/blob/master/cortex-m-semihosting/build.rs#L10-L15

CC @jonas-schievink who I think worked on the prebuild static archives most recently in #262

[jamesmunns]

We should probably mirror the build.rs changes made in this commit:

73a9d29#diff-d0d98998092552a1d3259338c2c71e118a5b8343dd4703c0c7f552ada7f9cb42

[jonas-schievink]

Seems like cargo package doesn't include the right files here? We do have tests for cortex-m-semihosting and those worked fine prior to publishing.

What if we symlink cortex-m-semihosting/bin to ../bin? Will cargo package include the files?

[jonas-schievink]

Yanked 0.4.0

[adamgreig]

@jonas-schievink, it seems to me like we could forward the inline-asm feature of c-m-sh to its c-m dependency and use the new syscall added to cortex-m, therefore removing c-m-sh's build script and prebuilt binary entirely?

[jonas-schievink]

yeah that should work

[adamgreig]

Though it will mean c-m-sh 0.4 requires c-m 0.7 (not yet released) which is unfortunate, hm.

[adamgreig]

Well, that didn't work so well.

          rust-lld: error: duplicate symbol: __wfi
          >>> defined at inline.rs:13 (asm/inline.rs:13)
          >>>            bin/thumbv7em-none-eabihf.o:(__wfi) in archive /tmp/rustckWdISd/libcortex_m_semihosting-33bbc22c19d1c0ab.rlib
          >>> defined at asm.s:189
          >>>            cortex-m.o:(.text.__wfi+0x1) in archive /tmp/rustckWdISd/libcortex_m-c1c501809caa9026.rlib

[nickray]

What's the status on this?

If I have a library that uses cortex-m 0.7, since 0.4.0 is yanked and 0.4.1 unpublished, I get a cortex-m-semihosting that forces cortex-m 0.6, which ends up with a warning: Linking globals named 'CORE_PERIPHERALS': symbol multiply defined! and an error: failed to load bc of "cortex_m-faf0ca0469234fc4.cortex_m.2vla0p20-cgu.0.rcgu.o".

I'm a bit confused :)

[adamgreig]

This should now be fixed by the new cortex-m-semihosting release v0.3.6, which supports either cortex-m 0.6 or cortex-m 0.7.