I have 2 errors with lang/rust-bootstrap:

error: unnecessary parentheses around block return value
    --> src/bootstrap/lib.rs:1029:9
     |
1029 |         (target.contains("linux-gnu") || target.contains("apple-darwin"))
     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
     |
     = note: `-D unused-parens` implied by `-D warnings`


error: unused extern crate
 --> src/librustc_macros/src/lib.rs:4:1
  |
4 | extern crate proc_macro;
  | ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
  |
  = note: `-D unused-extern-crates` implied by `-D warnings`

In D24020#528288, @tobik wrote:

• Attempt to unbreak rust-bootstrap by turning off deny-warnings

That fixed the issue, thanks.

OK on 13amd64, 13i386, armv7 and ppc64 elfv2. I'll have the result for other arches tomorrow.

edit: ok on armv6 and ppc64 elfv1
I have a problem on aarch64:

command did not execute successfully: "/usr/ports/lang/rust/work/rustc-1.42.0-src/build/aarch64-unknown-freebsd/stage0/bin/cargo" "build" "-Zconfig-profile" "--target" "aarch64-unknown-freebsd" "-Zbinary-dep-de
pinfo" "-j" "4" "-v" "--release" "--frozen" "--manifest-path" "/usr/ports/lang/rust/work/rustc-1.42.0-src/src/tools/miri/Cargo.toml" "--message-format" "json-render-diagnostics"
expected success, got: signal: 11
      < ToolBuild { compiler: Compiler { stage: 2, host: "aarch64-unknown-freebsd" }, target: "aarch64-unknown-freebsd", tool: "cargo-miri", path: "src/tools/miri", mode: ToolRustc, is_optional_tool: true, sour
ce_type: Submodule, extra_features: [] }
    < CargoMiri { compiler: Compiler { stage: 2, host: "aarch64-unknown-freebsd" }, target: "aarch64-unknown-freebsd", extra_features: [] }
thread 'main' panicked at 'Unable to build cargo miri', src/bootstrap/dist.rs:65:9

In D24020#528377, @mikael wrote:

I have a problem on aarch64:

command did not execute successfully: "/usr/ports/lang/rust/work/rustc-1.42.0-src/build/aarch64-unknown-freebsd/stage0/bin/cargo" "build" "-Zconfig-profile" "--target" "aarch64-unknown-freebsd" "-Zbinary-dep-de
pinfo" "-j" "4" "-v" "--release" "--frozen" "--manifest-path" "/usr/ports/lang/rust/work/rustc-1.42.0-src/src/tools/miri/Cargo.toml" "--message-format" "json-render-diagnostics"
expected success, got: signal: 11
      < ToolBuild { compiler: Compiler { stage: 2, host: "aarch64-unknown-freebsd" }, target: "aarch64-unknown-freebsd", tool: "cargo-miri", path: "src/tools/miri", mode: ToolRustc, is_optional_tool: true, sour
ce_type: Submodule, extra_features: [] }
    < CargoMiri { compiler: Compiler { stage: 2, host: "aarch64-unknown-freebsd" }, target: "aarch64-unknown-freebsd", extra_features: [] }
thread 'main' panicked at 'Unable to build cargo miri', src/bootstrap/dist.rs:65:9

Do you have a full log?

In D24020#528541, @tobik wrote:

In D24020#528377, @mikael wrote:

I have a problem on aarch64:

command did not execute successfully: "/usr/ports/lang/rust/work/rustc-1.42.0-src/build/aarch64-unknown-freebsd/stage0/bin/cargo" "build" "-Zconfig-profile" "--target" "aarch64-unknown-freebsd" "-Zbinary-dep-de
pinfo" "-j" "4" "-v" "--release" "--frozen" "--manifest-path" "/usr/ports/lang/rust/work/rustc-1.42.0-src/src/tools/miri/Cargo.toml" "--message-format" "json-render-diagnostics"
expected success, got: signal: 11
      < ToolBuild { compiler: Compiler { stage: 2, host: "aarch64-unknown-freebsd" }, target: "aarch64-unknown-freebsd", tool: "cargo-miri", path: "src/tools/miri", mode: ToolRustc, is_optional_tool: true, sour
ce_type: Submodule, extra_features: [] }
    < CargoMiri { compiler: Compiler { stage: 2, host: "aarch64-unknown-freebsd" }, target: "aarch64-unknown-freebsd", extra_features: [] }
thread 'main' panicked at 'Unable to build cargo miri', src/bootstrap/dist.rs:65:9

Do you have a full log?

No, it's probably a problem on my board. I'm rebuilding it.

It's ok on aarch64