Building fails with: error[E0557]: feature has been removed

[Frederik-Baetens]

relevant output of trying to run cargo build --example hello:

error[E0557]: feature has been removed
--> /home/frederik/.cargo/registry/src/github.com-1ecc6299db9ec823/panic-semihosting-0.3.0/src/lib.rs:59:12
|
59 | #![feature(panic_implementation)]
| ^^^^^^^^^^^^^^^^^^^^
|
note: subsumed by #[panic_handler]
--> /home/frederik/.cargo/registry/src/github.com-1ecc6299db9ec823/panic-semihosting-0.3.0/src/lib.rs:59:12
|
59 | #![feature(panic_implementation)]
| ^^^^^^^^^^^^^^^^^^^^

error[E0658]: The attribute panic_implementation is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
--> /home/frederik/.cargo/registry/src/github.com-1ecc6299db9ec823/panic-semihosting-0.3.0/src/lib.rs:71:3
|
71 | #[panic_implementation]
| ^^^^^^^^^^^^^^^^^^^^
|
= help: add #![feature(custom_attribute)] to the crate attributes to enable

[bobgates]

Any news? This caught me as well.

[rvlander]

I could move two step further. I changed the panic-semihostic dependency version to 0.5.2 in cargo.toml

But then there is a failure on:

error: use of deprecated item 'hal::prelude::_embedded_hal_digital_OutputPin::set_low': Deprecated because the methods cannot return errors. Users should use the traits in digital::v2.
   --> src/led.rs:168:18
    |
168 |         self.pex.set_low()
    |                  ^^^^^^^
    |
note: lint level defined here
   --> src/lib.rs:40:9
    |
40  | #![deny(warnings)]
    |         ^^^^^^^^
    = note: #[deny(deprecated)] implied by #[deny(warnings)]

error: use of deprecated item 'hal::prelude::_embedded_hal_digital_OutputPin::set_high': Deprecated because the methods cannot return errors. Users should use the traits in digital::v2.
   --> src/led.rs:173:18
    |
173 |         self.pex.set_high()
    |                  ^^^^^^^^

error: aborting due to 2 previous errors

error: Could not compile `f3`.

You can disable it by commenting #![deny(warnings)] directive in lib.rs.

But at this step there is a error with the linker:

  = note: rust-lld: error: unknown argument: -Wl,-Tlink.x
          rust-lld: error: unknown argument: -nostartfiles

I tested with both stable and nighlty.

[rvlander]

Got it running by modifying .cargo/config to:

[target.thumbv7em-none-eabi]
runner = 'arm-none-eabi-gdb'
rustflags = [
  "-C", "link-arg=-Tlink.x",
#  "-C", "link-arg=-Wl,-Tlink.x",
#  "-C", "link-arg=-nostartfiles",
]

[target.thumbv7em-none-eabihf]
runner = 'arm-none-eabi-gdb'
rustflags = [
  "-C", "link-arg=-Tlink.x",
#  "-C", "link-arg=-Wl,-Tlink.x",
#  "-C", "link-arg=-nostartfiles",
]

[build]
target = "thumbv7em-none-eabihf"

I also add the following line to~/.gdbinit:

set auto-load safe-path /

This configuration might be unsafe.

Also, do not forget to install arm-none-eabi-gdb

[rvlander]

Some other examples still won't compile. I guess this crate needs to be refactored to use the updated version of the hall. Any plans?