Rust 1.19 fails to build on i686 on ‘staging’

[Ludovic Courtès]

Hello,

Rust fails to build on i686 on ‘staging’, so I don’t know if it’s
deterministic (the “unexpected EOF” reminds me of parallel build issues
with half-baked makefiles):

--8<---------------cut here---------------start------------->8---
BUILDING crates_io from crates-io v0.9.0 with features []
> /gnu/store/fw4yy7cgb5ahs9s2ir00bawnsl5zj7db-mrustc-0.8.0/bin/mrustc 
> src/tools/cargo/src/crates-io/lib.rs --crate-name crates_io --crate-type rlib 
> --crate-tag 0_9_0 -g --cfg debug_assertions -O -o 
> output/cargo-build/libcrates_io-0_9_0.hir -L output/cargo-build --extern 
> curl=output/cargo-build/libcurl-0_4_6.hir --extern 
> error_chain=output/cargo-build/liberror_chain-0_10_0.hir --extern 
> serde=output/cargo-build/libserde-1_0_6.hir --extern 
> serde_derive=output/cargo-build/libserde_derive-1_0_6.hir --extern 
> serde_json=output/cargo-build/libserde_json-1_0_2.hir --extern 
> url=output/cargo-build/liburl-1_4_0.hir -L output -L 
> /gnu/store/fw4yy7cgb5ahs9s2ir00bawnsl5zj7db-mrustc-0.8.0/lib/mrust
munmap_chunk(): invalid pointer
src/tools/cargo/src/crates-io/lib.rs:65: BUG:src/expand/proc_macro.cpp:941: 
Unexpected EOF while reading from child process
BUILD FAILED
Backtrace:
           5 (primitive-load "/gnu/store/g1pwkbic91004khxrs8qfnhszs7…")
In ice-9/eval.scm:
   191:35  4 (_ _)
In srfi/srfi-1.scm:
   863:16  3 (every1 #<procedure 835a520 at /gnu/store/w8ki740gbcib…> …)
In 
/gnu/store/w8ki740gbcibbifmljwjpd0vmix5jw8q-module-import/guix/build/gnu-build-system.scm:
   799:28  2 (_ _)
In ice-9/eval.scm:
    619:8  1 (_ #(#(#(#<directory (guile-user) 817e910>) (# # …) …) …))
In 
/gnu/store/w8ki740gbcibbifmljwjpd0vmix5jw8q-module-import/guix/build/utils.scm:
    616:6  0 (invoke _ . _)

/gnu/store/w8ki740gbcibbifmljwjpd0vmix5jw8q-module-import/guix/build/utils.scm:616:6:
 In procedure invoke:
Throw to key `srfi-34' with args `(#<condition &invoke-error [program: 
"/gnu/store/fw4yy7cgb5ahs9s2ir00bawnsl5zj7db-mrustc-0.8.0/tools/bin/minicargo" 
arguments: ("src/tools/cargo" "--vendor-dir" "src/vendor" "--output-dir" 
"output/cargo-build" "-L" "output/" "-L" 
"/gnu/store/fw4yy7cgb5ahs9s2ir00bawnsl5zj7db-mrustc-0.8.0/lib/mrust" "-j" "1") 
exit-status: 1 term-signal: #f stop-signal: #f] 80aaa80>)'.
builder for `/gnu/store/380l4b9qdz9knbpnhby0npacmgihbggf-rust-1.19.0.drv' 
failed with exit code 1
--8<---------------cut here---------------end--------------->8---

(From 
<https://berlin.guixsd.org/log/qhnlh1hyc8h8505cikmxmc0c3mqv1kgj-rust-1.19.0>.)

Thoughts?

Ludo’.