Which version of avr-rust should be used to build this? And, most importantly, which version of libcore?

I have just built avr-rust from HEAD (commit 512f3ae0cb18e9bb975a8d9fb4c73cd93d49ccbb) and I cannot find a matching libcore.

This issue has reported upstream at https://github.com/rust-lang/rust/issues/76930. Following the AVR Rust book, the program cannot compile due to a segmentation fault when compiling the core crate on the latest nightly build.

~/code/blink ><> cargo build -Z build-std=core --target avr-atmega328p.json --release
   Compiling core v0.0.0 (/home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling rustc-std-workspace-core v1.99.0 (/home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
   Compiling compiler_builtins v0.1.35
   Compiling ruduino v0.2.0
error: could not compile `core`

Caused by:
  process didn't exit successfully: `rustc --crate-name core --edition=2018 /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=775b9b151bd266b1 -C extra-filename=-775b9b151bd266b1 --out-dir /home/bacongobbler/code/blink/target/avr-atmega328p/release/deps --target /home/bacongobbler/code/blink/avr-atmega328p.json -Z force-unstable-if-unmarked -L dependency=/home/bacongobbler/code/blink/target/avr-atmega328p/release/deps -L dependency=/home/bacongobbler/code/blink/target/release/deps --cap-lints allow` (signal: 11, SIGSEGV: invalid memory reference)
warning: build failed, waiting for other jobs to finish...
error: build failed

Using the debug target also fails with more information:

~/code/blink ><> cargo build -Z build-std=core --target avr-atmega328p.json
   Compiling blink v0.1.0 (/home/bacongobbler/code/blink)
error: linking with `avr-gcc` failed: exit code: 1
  |
  = note: "avr-gcc" "-mmcu=atmega328p" "-L" "/home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/avr-atmega328p/lib" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.14gicplk3a8rd2mf.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.14qeofa20egw9nwf.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.1wmmysfy11urhzf0.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.24kbbo2eafqv76ap.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.2mrol613m7r8fe4h.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.2ygh13f44y84rejg.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.3gpysx65vrtx1mw3.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.3hgcd7rk5gitckx.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.4fk979zh9rz3tdvf.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.4xxrwed9dq0c99sc.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.5c9h7xhuo2dh8daz.rcgu.o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.fooo9so7gsdl2oq.rcgu.o" "-o" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.elf" "-Wl,--gc-sections" "-nodefaultlibs" "-L" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps" "-L" "/home/bacongobbler/code/blink/target/debug/deps" "-L" "/home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/avr-atmega328p/lib" "-Wl,--start-group" "-Wl,-Bstatic" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libruduino-320958a79d2f2860.rlib" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/librustc_std_workspace_core-29c9d0aa85cbe977.rlib" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libcore-69e33a9af4453194.rlib" "-Wl,--end-group" "/home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libcompiler_builtins-f1cb32ff07da7789.rlib" "-Wl,-Bdynamic" "-lgcc"
  = note: /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.3gpysx65vrtx1mw3.rcgu.o: In function `core::intrinsics::is_nonoverlapping::h95d5cae38d8a279d':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1754: undefined reference to `abort'
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1754: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.3gpysx65vrtx1mw3.rcgu.o: In function `core::intrinsics::copy_nonoverlapping::h106c315c8151203b':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1860: undefined reference to `memcpy'
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1855: undefined reference to `abort'
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1855: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.3gpysx65vrtx1mw3.rcgu.o: In function `core::intrinsics::is_aligned_and_not_null::h4f686583b9419b1a':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1745: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.4fk979zh9rz3tdvf.rcgu.o: In function `core::ptr::swap_nonoverlapping_bytes::h263f7c0912ae4c3d':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:472: undefined reference to `abort'
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:494: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/blink-40c8e0f02000ab5f.4fk979zh9rz3tdvf.rcgu.o:/home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:500: more undefined references to `abort' follow
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libcore-69e33a9af4453194.rlib(core-69e33a9af4453194.core.a37ui6x9-cgu.13.rcgu.o): In function `core::intrinsics::copy_nonoverlapping::h12295594d5eb04a5':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1860: undefined reference to `memcpy'
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1855: undefined reference to `abort'
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:1855: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libcore-69e33a9af4453194.rlib(core-69e33a9af4453194.core.a37ui6x9-cgu.3.rcgu.o): In function `core::panicking::panic::hf3e1dc38e8693d18':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/num/bignum.rs:287: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libcore-69e33a9af4453194.rlib(core-69e33a9af4453194.core.a37ui6x9-cgu.3.rcgu.o): In function `core::panicking::panic_fmt::hbbf5d4a80efa2a13':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:85: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libcore-69e33a9af4453194.rlib(core-69e33a9af4453194.core.a37ui6x9-cgu.9.rcgu.o): In function `core::option::Option$LT$T$GT$::unwrap::h73d81fcba2eb990c':
          /home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:381: undefined reference to `abort'
          /home/bacongobbler/code/blink/target/avr-atmega328p/debug/deps/libcore-69e33a9af4453194.rlib(core-69e33a9af4453194.core.a37ui6x9-cgu.9.rcgu.o):/home/bacongobbler/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:(.text._ZN4core6option15Option$LT$T$GT$6unwrap17h73d81fcba2eb990cE+0x5e): more undefined references to `abort' follow
          collect2: error: ld returned 1 exit status
          

error: aborting due to previous error

error: could not compile `blink`

To learn more, run the command again with --verbose.

hi, getting this during compiling

cargo build -Z build-std=core --target avr-atmega328p.json --release
...

   Compiling avr_delay v0.3.1
error: cannot find macro `llvm_asm` in this scope
  --> /Users/zag2art/.cargo/registry/src/github.com-1ecc6299db9ec823/avr_delay-0.3.1/src/lib.rs:34:17
   |
34 |         unsafe {llvm_asm!("1: sbiw $0,1
   |                 ^^^^^^^^

error: cannot find macro `llvm_asm` in this scope
  --> /Users/zag2art/.cargo/registry/src/github.com-1ecc6299db9ec823/avr_delay-0.3.1/src/lib.rs:41:13
   |
41 |     unsafe {llvm_asm!("1: sbiw $0,1
   |             ^^^^^^^^

is that an avr_delay issue or this blink project?

Note: compiling this on Mac folowing "The AVR-Rust Guidebook"

I followed instructions for avr-rust and blink compilation. But I am getting this error:

$ RUST_BACKTRACE=1 rustup run avr-toolchain xargo build --target avr-atmega328p --release --verbose
+ "rustc" "rustc" "--print" "sysroot"
+ "rustc" "rustc" "--print" "target-list"
+ RUSTFLAGS="--sysroot /home/greatgodoffire/.xargo -Z force-unstable-if-unmarked"
+ "cargo" "cargo" "build" "--release" "--manifest-path" "/tmp/xargo.MNxWNBlqynYS/Cargo.toml" "--target" "avr-atmega328p" "-v" "-p" "core"
warning: Patch `rustc-std-workspace-alloc v1.0.0 (/home/greatgodoffire/rust/rust/src/tools/rustc-std-workspace-alloc)` was not used in the crate graph.
Patch `rustc-std-workspace-core v1.0.0 (/home/greatgodoffire/rust/rust/src/tools/rustc-std-workspace-core)` was not used in the crate graph.
Check that the patched package version and available features are compatible
with the dependency requirements. If the patch has a different version from
what is locked in the Cargo.lock file, run `cargo update` to use the new
version. This may also occur with an optional dependency that is not enabled.
   Compiling core v0.0.0 (/home/greatgodoffire/rust/rust/src/libcore)
     Running `rustc --crate-name core --edition=2018 /home/greatgodoffire/rust/rust/src/libcore/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C metadata=e4bf3f58269cc549 -C extra-filename=-e4bf3f58269cc549 --out-dir /tmp/xargo.MNxWNBlqynYS/target/avr-atmega328p/release/deps --target avr-atmega328p -L dependency=/tmp/xargo.MNxWNBlqynYS/target/avr-atmega328p/release/deps -L dependency=/tmp/xargo.MNxWNBlqynYS/target/release/deps --sysroot /home/greatgodoffire/.xargo -Z force-unstable-if-unmarked`
error: Unrecognized option: 'json'

error: could not compile `core`.

Caused by:
  process didn't exit successfully: `rustc --crate-name core --edition=2018 /home/greatgodoffire/rust/rust/src/libcore/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C metadata=e4bf3f58269cc549 -C extra-filename=-e4bf3f58269cc549 --out-dir /tmp/xargo.MNxWNBlqynYS/target/avr-atmega328p/release/deps --target avr-atmega328p -L dependency=/tmp/xargo.MNxWNBlqynYS/target/avr-atmega328p/release/deps -L dependency=/tmp/xargo.MNxWNBlqynYS/target/release/deps --sysroot /home/greatgodoffire/.xargo -Z force-unstable-if-unmarked` (exit code: 1)
error: `"cargo" "cargo" "build" "--release" "--manifest-path" "/tmp/xargo.MNxWNBlqynYS/Cargo.toml" "--target" "avr-atmega328p" "-v" "-p" "core"` failed with exit code: Some(101)
stack backtrace:
   0: error_chain::make_backtrace
   1: <error_chain::State as core::default::Default>::default
   2: <std::process::Command as xargo::extensions::CommandExt>::run
   3: xargo::sysroot::build
   4: xargo::sysroot::update
   5: xargo::main_inner
   6: std::rt::lang_start::{{closure}}
   7: std::rt::lang_start_internal::{{closure}}
             at src/libstd/rt.rs:52
      std::panicking::try::do_call
             at src/libstd/panicking.rs:292
   8: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:78
   9: std::panicking::try
             at src/libstd/panicking.rs:270
      std::panic::catch_unwind
             at src/libstd/panic.rs:394
      std::rt::lang_start_internal
             at src/libstd/rt.rs:51
  10: main
  11: __libc_start_main
  12: _start

I'm using Ubuntu 16.04 and I've compiled avr-rust yesterday.

$ xargo --version
xargo 0.3.19
cargo 1.42.0-nightly (9d32b7b01 2020-01-26)

After setting up my cross compiler as per the avr-rust/rust readme, and compiling the unmolested blink program, I upload to my arduino uno clone, and the LED (PORTB 5 or arduino pin 13) doesn't blink, or even come on. reversing the order of the writes doesn't seem to help, but if I add a "loop {}" after setting PORTB to 0xFF, the led will stay lit as I expect.

Is it possible that small_delay is getting optimized away? If I do something like

    loop {
        for _ in 0..100000 {
            unsafe { write_volatile(PORTB, 0x00) }
        }
        for _ in 0..100000 {
            unsafe { write_volatile(PORTB, 0xFF) }
        }
    }

I get a proper fast blink.

This issue is a pointer to https://github.com/rust-lang/compiler-builtins/issues/400 it is about

"LLVM ERROR: Not supported instr" on avr-unknown-gnu-atmega328

I changed this in my exploration of Arduino Uno. I wanted to explore the capabilities of ruduino and I found this nice abstractions that may be more beginner friendly.

I'm not sure if this belongs here or on the main avr-rust/rust repo, but just wanted to post this here in case it's helpful to anyone else.

I'm using Xargo on Arch Linux with the latest commit of the avr-rust/rust master branch.

I managed to get past avr-rust/rust#128 using hercek's patches, but building compiler_builtins failed because of a use of the cfg_config_vendor feature. That feature was stabilized earlier this year, but the it looks like the AVR patched Rust version hasn't pulled upstream since the stabilization.

To fix this, I simply modified the downloaded source for lib.rs in compiler_builtins in the Cargo registry folder (~/.cargo/registry/src/github.com-1ecc6299db9ec823/compiler_builtins-0.1.12/src/lib.rs on my machine), adding the missing #![feature(cfg_target_vendor)] line to the existing feature flags in that file.

I also get a message that indicates that it might be possible to set a version for compiler_builtins, though I wasn't able to figure out how: warning: dependency (compiler_builtins) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions

The last version of compiler_builtins that has the cfg_target_vendor feature flag appears to be 0.1.5. (relevant commit)

More version info:

$ rustup run avr-toolchain xargo -V
xargo 0.3.14
cargo 1.36.0-nightly (6be12653d 2019-04-19)

$ rustup run avr-toolchain rustc -V
rustc 1.33.0-dev

I followed instructions for avr-rust and blink compilation. But I am getting this error:

➤ rustup run avr-toolchain xargo build --target avr-atmega328p --release
warning: Patch `rustc-std-workspace-core v1.0.0 (/home/linguini/Desktop/rust/rust-avr/src/tools/rustc-std-workspace-core)` was not used in the crate graph.
Check that the patched package version and available features are compatible
with the dependency requirements. If the patch has a different version from
what is locked in the Cargo.lock file, run `cargo update` to use the new
version. This may also occur with an optional dependency that is not enabled.
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `rustc - --crate-name ___ --print=file-names --sysroot /home/linguini/.xargo -Z force-unstable-if-unmarked --target avr-atmega328p --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro` (exit code: 1)
--- stderr
error: Error loading target specification: Could not find specification for target "avr-atmega328p"
  |
  = help: Use `--print target-list` for a list of built-in targets


error: `"cargo" "build" "--release" "--manifest-path" "/tmp/xargo.GqdRz0LJNIMX/Cargo.toml" "--target" "avr-atmega328p" "-p" "core"` failed with exit code: Some(101)
stack backtrace:
   0: error_chain::make_backtrace::h90af62d5c4a6fbd6 (0x55fde99c316b)
   1: <error_chain::State as core::default::Default>::default::h23f817a122243ac9 (0x55fde99c3235)
   2: <std::process::Command as xargo::extensions::CommandExt>::run::h01346a6b4f35f543 (0x55fde9976d4b)
   3: xargo::sysroot::build::h240260972f2e09ed (0x55fde997e541)
   4: xargo::sysroot::update::h94fd82f52808b493 (0x55fde998265d)
   5: xargo::main::ha282b52dabbcaa07 (0x55fde996fc7a)
   6: std::rt::lang_start::{{closure}}::h6c099b348d99c7de (0x55fde99738f2)
   7: std::rt::lang_start_internal::{{closure}}::h53f6e74893a27d59 (0x55fde99ee162)
             at src/libstd/rt.rs:59
      std::panicking::try::do_call::h8945e3e0fe63365a
             at src/libstd/panicking.rs:307
   8: __rust_maybe_catch_panic (0x55fde99fb1a9)
             at src/libpanic_unwind/lib.rs:102
   9: std::panicking::try::hee49dda4da841cb1 (0x55fde99ee058)
             at src/libstd/panicking.rs:286
  10: std::panic::catch_unwind::h89d0b17e1bb724c9 (0x55fde99e1665)
             at src/libstd/panic.rs:398
      std::rt::lang_start_internal::hcbec2a0475a1169a
             at src/libstd/rt.rs:58
  11: main (0x55fde9970a61)
  12: __libc_start_main (0x7f6283dcf222)
  13: _start (0x55fde99601ad)
  14: <unknown> (0x0)

I'm using Arch Linux and I used latest version of avr-rust from avr-support branch(cea79f77f5eac10eddf63e1e8728fd0e34c5998f).

➤ rustup -V
rustup 1.16.0

➤ xargo -V
xargo 0.3.13
cargo 1.34.0-nightly (865cb7010 2019-02-10)

Since #40

stappers@myhost:~/src/rust/RustAVR/blink
$ cargo version
cargo 1.63.0-nightly (38472bc19 2022-05-31)
stappers@myhost:~/src/rust/RustAVR/blink
$ cargo build
error: error in /home/stappers/src/rust/RustAVR/blink/.cargo/config.toml: could not load config key `env.AVR_CPU_FREQUENCY_HZ`

Caused by:
  data did not match any variant of untagged enum EnvConfigValueInner
stappers@myhost:~/src/rust/RustAVR/blink
$ 

I get this error compiling the project. The whole error message:

PS C:\Users\woppe\Documents\Rust\blink> cargo build -Z build-std=core --target avr-atmega328p.json --release
   Compiling compiler_builtins v0.1.49
warning: target json file contains unused fields: no-compiler-rt

   Compiling avr-config v1.0.0
   Compiling avr-config v2.0.1
   Compiling avr-std-stub v1.0.2
   Compiling avr_delay v0.3.1
warning: `avr-config` (lib) generated 1 warning (1 duplicate)
warning: `avr-std-stub` (lib) generated 1 warning (1 duplicate)
warning: `avr-config` (lib) generated 1 warning (1 duplicate)
   Compiling ruduino v0.3.2
error: couldn't allocate input reg for constraint 'w'
  --> C:\Users\woppe\.cargo\registry\src\github.com-1ecc6299db9ec823\avr_delay-0.3.1\src\lib.rs:34:17
   |
34 |         unsafe {llvm_asm!("1: sbiw $0,1
   |                 ^

warning: `avr_delay` (lib) generated 1 warning (1 duplicate)
error: could not compile `avr_delay` due to previous error; 1 warning emitted
warning: build failed, waiting for other jobs to finish...
LLVM ERROR: Not supported instr: <MCInst 312 <MCOperand Reg:1> <MCOperand Imm:13> <MCOperand Reg:41>>
warning: `compiler_builtins` (lib) generated 1 warning
warning: `ruduino` (lib) generated 1 warning (1 duplicate)
error: build failed

This issue is to report that

WARN rustc_codegen_ssa::back::link Linker does not support -no-pie command line option. Retrying without.

is a known warning.

And this issue to tell how a succesfull build looks.

stappers@myhost:~/src/rust/RustAVR/blink
$ cargo clean ; cargo version ; rustc --version
cargo 1.63.0-nightly (38472bc19 2022-05-31)
rustc 1.63.0-nightly (fee3a459d 2022-06-05)
stappers@myhost:~/src/rust/RustAVR/blink
$ cargo build --release
   Compiling proc-macro2 v1.0.39
   Compiling unicode-ident v1.0.0
   Compiling compiler_builtins v0.1.73
   Compiling syn v1.0.96
   Compiling json v0.12.4
   Compiling core v0.0.0 (/home/stappers/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core)
   Compiling xml-rs v0.8.4
   Compiling lazy_static v1.4.0
   Compiling target-cpu-fetch v0.1.3
   Compiling xmltree v0.10.3
   Compiling target-cpu-macro v0.1.3
   Compiling avr-mcu v0.3.5
   Compiling quote v1.0.18
   Compiling ruduino v0.4.0 (https://github.com/avr-rust/ruduino?branch=master#a33d38a7)
   Compiling const_env_impl--value v0.1.2
   Compiling const_env--value v0.1.2
   Compiling rustc-std-workspace-core v1.99.0
     (/home/stappers/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core)
   Compiling avr-config v2.0.1
   Compiling avr-std-stub v1.0.3
   Compiling avr_delay v0.4.0 (https://github.com/avr-rust/delay#cfe9848f)
   Compiling blink v0.1.0 (/home/stappers/src/rust/RustAVR/blink)
WARN rustc_codegen_ssa::back::link Linker does not support -no-pie command line option. Retrying without.
    Finished release [optimized] target(s) in 7.12s
stappers@myhost:~/src/rust/RustAVR/blink
$ file target/avr-atmega328p/release/blink.elf 
target/avr-atmega328p/release/blink.elf: ELF 32-bit LSB executable, Atmel AVR 8-bit, version 1 (SYSV),
  statically linked, with debug_info, not stripped
stappers@myhost:~/src/rust/RustAVR/blink
$