compiler_builtins build failure

[Shane Leonard]

Hi all,

I have run into this issue multiple times in the past, and it still stumps me. I'm sure other people have experienced it, so I thought this would be a good place to discuss it.

Whenever we bump the rust toolchain, the build system tries to update my toolchain automatically when I run 'make'. However, it often catastrophically fails when trying to build the compiler_builtins crate, complaining that associated consts are experimental.

How do I deal with this issue? I've encountered it before and it seems like I've only been able to solve it by flailing around for awhile on my rust version.

Thanks,

Shane

[Amit Levy]

Do you have an error trace? Is this happening to you on the Teensy repo? I think in the main repo all the versioning stuff is handled by the Makefiles.

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[Shane Leonard]

Currently it's happening on the Teensy repo. Here's the error trace:

/Applications/Xcode.app/Contents/Developer/usr/bin/make -C boards/teensy/

   Compiling core v0.0.0 (file:///Users/shaneleonard/.rustup/toolchains/nightly-2017-06-20-x86_64-apple-darwin/lib/rustlib/src/rust/src/libcore)

    Finished release [optimized] target(s) in 14.18 secs

    Updating git repository `https://github.com/rust-lang-nursery/compiler-builtins`
    Compiling compiler_builtins v0.1.0 (https://github.com/rust-lang-nursery/compiler-builtins#1be2858d)

error: associated constants are experimental (see issue #29646)

  --> /Users/shaneleonard/.cargo/git/checkouts/compiler-builtins-ec094dc45a0179c8/1be2858/src/int/mod.rs:46:5

   |

46 |     const BITS: u32;

   |     ^^^^^^^^^^^^^^^^

   |

   = help: add #![feature(associated_consts)] to the crate attributes to enable

... (same error repeated many times at various locations) ...

error: aborting due to previous error(s)

error: Could not compile `compiler_builtins`.

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

error: `"cargo" "build" "--release" "--manifest-path" "/var/folders/1f/qr7_cp3j2zdbz_3nh5q_y_840000gn/T/xargo.ggPBhS1As5gw/Cargo.toml" "--target" "thumbv7em-none-eabi" "-p" "compiler_builtins"` failed with exit code: Some(101)

What's missing from the Makefiles?

Shane

[Amit Levy]

Strange. I'm not sure! It looks like you're including the `Makefile.common` from the tock subrepo that includes all that logic. It also looks like you're using a version of Rust from June, while the main repo has been on a version from September. You also have a an `Xargo.toml` file that doesn't specify the particular version of `compiler-builtins` to use. Can you try just copying the Xargo.toml file from, e.g., imix or hail?

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[Shane Leonard]

Here's the first part of the output from make V=1:

*************************************************

TOCK KERNEL BUILD SYSTEM -- VERBOSE BUILD

**************************************************

Config:

MAKEFLAGS= -r -R

OBJCOPY=arm-none-eabi-objcopy

PLATFORM=teensy

RUSTUP_TOOLCHAIN=nightly-2017-06-20

XARGO_VERSION=0.3.8

TARGET=thumbv7em-none-eabi

TOCK_KERNEL_VERSION=95c6a64

TOOLCHAIN=arm-none-eabi

arm-none-eabi-objcopy --version = GNU objcopy (GNU Tools for ARM Embedded Processors 6-2017-q2-update) 2.28.0.20170620 Copyright (C) 2017 Free Software Foundation, Inc. This program is free software; you may redistribute it under the terms of the GNU General Public License version 3 or (at your option) any later version. This program has absolutely no warranty.

rustc --version = rustc 1.12.1 (d4f39402a 2016-10-19)

**************************************************

RUSTFLAGS="-C link-arg=-nostartfiles -C link-arg=-Tlayout.ld" xargo build --target=thumbv7em-none-eabi --verbose --release

+ "rustc" "--print" "sysroot"

+ "rustc" "--print" "target-list"

+ "cargo" "build" "--release" "--manifest-path" "/var/folders/1f/qr7_cp3j2zdbz_3nh5q_y_840000gn/T/xargo.zRhrMLrKqpq4/Cargo.toml" "--target" "thumbv7em-none-eabi" "-v" "-p" "core"

[Shane Leonard]

The Xargo.toml file in boards/teensy is already identical to the ones in boards/imix and boards/hail...

[Shane Leonard]

My version of tock is frozen at the June version though, I can try updating it and seeing if I get a different result.

[Shane Leonard]

Updating my tock to the current revision and copying the Xargo.toml file from hail fixed the issue. The version of tock I was using originally hadn't specified the revision of compiler_builtins that was needed, so that made its way into the Teensy Xargo file. Thanks for the help!