Internal error while building compiler_builtins for i686 targets

[robert-w-gries]

Nightly Version

$ rustup show
[snip]

active toolchain
----------------

nightly-x86_64-unknown-linux-gnu (default)
rustc 1.27.0-nightly (4b9b70c39 2018-04-09)

Reproduction Steps

$ rustup component add rust-src
$ cargo install xargo
$ xargo new foo --bin
     Created binary (application) `foo` project
$ cd foo/
$ echo "[dependencies.alloc]" > Xargo.toml
$ xargo build --target i686-unknown-linux-gnu

Error Message

$ xargo build --target i686-unknown-linux-gnu
    Updating registry `https://github.com/rust-lang/crates.io-index`
   Compiling cc v1.0.9                                                          
   Compiling core v0.0.0 (file:///home/rob/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore)
   Compiling compiler_builtins v0.0.0 (file:///home/rob/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/rustc/compiler_builtins_shim)
error: failed to run custom build command for `compiler_builtins v0.0.0 (file:///home/rob/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/rustc/compiler_builtins_shim)`
process didn't exit successfully: `/tmp/xargo.Uqnk6A23t05W/target/release/build/compiler_builtins-f55661e1d900651e/build-script-build` (exit code: 101)
--- stdout
cargo:rerun-if-changed=build.rs
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/absvdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/absvsi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/absvti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/addvdi3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/addvsi3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/addvti3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/apple_versioning.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/ashldi3.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/ashrdi3.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/clzdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/clzsi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/clzti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/cmpdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/cmpti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/ctzdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/ctzsi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/ctzti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/divdc3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/divdi3.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/divsc3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/divxc3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/extendhfsf2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/ffsdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/ffsti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/floatdidf.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/floatdisf.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/floatdixf.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/floatundidf.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/floatundisf.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/floatundixf.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/int_util.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/lshrdi3.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/moddi3.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/muldc3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/muldi3.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/mulsc3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/mulvdi3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/mulvsi3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/mulvti3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/mulxc3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/negdf2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/negdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/negsf2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/negti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/negvdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/negvsi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/negvti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/paritydi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/paritysi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/parityti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/popcountdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/popcountsi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/popcountti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/powixf2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/subvdi3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/subvsi3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/subvti3.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/truncdfhf2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/truncdfsf2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/truncsfhf2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/ucmpdi2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/ucmpti2.c
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/udivdi3.S
cargo:rerun-if-changed=../../libcompiler_builtins/compiler-rt/lib/builtins/i386/umoddi3.S
TARGET = Some("i686-unknown-linux-gnu")
OPT_LEVEL = Some("3")
TARGET = Some("i686-unknown-linux-gnu")
HOST = Some("x86_64-unknown-linux-gnu")
TARGET = Some("i686-unknown-linux-gnu")
TARGET = Some("i686-unknown-linux-gnu")
HOST = Some("x86_64-unknown-linux-gnu")
CC_i686-unknown-linux-gnu = None
CC_i686_unknown_linux_gnu = None
TARGET_CC = None
CC = None
HOST = Some("x86_64-unknown-linux-gnu")
CROSS_COMPILE = None
TARGET = Some("i686-unknown-linux-gnu")
HOST = Some("x86_64-unknown-linux-gnu")
CFLAGS_i686-unknown-linux-gnu = None
CFLAGS_i686_unknown_linux_gnu = None
TARGET_CFLAGS = None
CFLAGS = None
DEBUG = Some("false")
TARGET = Some("i686-unknown-linux-gnu")
CC_i686-unknown-linux-gnu = None
CC_i686_unknown_linux_gnu = None
HOST_CC = None
CC = None
CFLAGS_i686-unknown-linux-gnu = None
CFLAGS_i686_unknown_linux_gnu = None
HOST_CFLAGS = None
CFLAGS = None
running: "cc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-m32" "-march=i686" "-fno-builtin" "-fvisibility=hidden" "-ffreestanding" "-DVISIBILITY_HIDDEN" "-o" "/tmp/xargo.Uqnk6A23t05W/target/i686-unknown-linux-gnu/release/build/compiler_builtins-2536234101d25e1c/out/../../libcompiler_builtins/compiler-rt/lib/builtins/absvdi2.o" "-c" "../../libcompiler_builtins/compiler-rt/lib/builtins/absvdi2.c"
cargo:warning=In file included from /usr/include/limits.h:25:0,
cargo:warning=                 from /usr/lib/gcc/x86_64-linux-gnu/5/include-fixed/limits.h:168,
cargo:warning=                 from /usr/lib/gcc/x86_64-linux-gnu/5/include-fixed/syslimits.h:7,
cargo:warning=                 from /usr/lib/gcc/x86_64-linux-gnu/5/include-fixed/limits.h:34,
cargo:warning=                 from ../../libcompiler_builtins/compiler-rt/lib/builtins/int_lib.h:68,
cargo:warning=                 from ../../libcompiler_builtins/compiler-rt/lib/builtins/absvdi2.c:15:
cargo:warning=/usr/include/features.h:367:25: fatal error: sys/cdefs.h: No such file or directory
cargo:warning=compilation terminated.
exit code: 1

--- stderr
thread 'main' panicked at '

Internal error occurred: Command "cc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-m32" "-march=i686" "-fno-builtin" "-fvisibility=hidden" "-ffreestanding" "-DVISIBILITY_HIDDEN" "-o" "/tmp/xargo.Uqnk6A23t05W/target/i686-unknown-linux-gnu/release/build/compiler_builtins-2536234101d25e1c/out/../../libcompiler_builtins/compiler-rt/lib/builtins/absvdi2.o" "-c" "../../libcompiler_builtins/compiler-rt/lib/builtins/absvdi2.c" with args "cc" did not execute successfully (status code exit code: 1).

[alexcrichton]

Thanks for the report! The last message here is the most relevant:

cargo:warning=/usr/include/features.h:367:25: fatal error: sys/cdefs.h: No such file or directory

perhaps a 32-bit compiler isn't installed?

[robert-w-gries]

What's strange to me is that I've never needed a 32-bit compiler when using the old compiler_builtins crate. It seems this issue only happens when compiler_builtins_shim is built.

The following works:

$ rustup override set nightly-2018-04-07
$ xargo build --target i686-unknown-linux-gnu
   Compiling core v0.0.0 (file:///home/rob/.rustup/toolchains/nightly-2018-04-07-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore)
   Compiling std_unicode v0.0.0 (file:///home/rob/.rustup/toolchains/nightly-2018-04-07-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd_unicode)
   Compiling alloc v0.0.0 (file:///home/rob/.rustup/toolchains/nightly-2018-04-07-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/liballoc)
    Finished release [optimized] target(s) in 30.39 secs
    Finished release [optimized] target(s) in 0.0 secs
   Compiling compiler_builtins v0.1.0 (file:///home/rob/.rustup/toolchains/nightly-2018-04-07-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcompiler_builtins)
    Finished release [optimized] target(s) in 2.55 secs

Edit:

To get the old compiler_builtins to build, I changed the Xargo.toml file to the following.

[dependencies.alloc]

[dependencies.core] # add this section if you didn't have it already
stage = 0

[dependencies.compiler_builtins] # add this section
features = ["mem"] # not really required
stage = 1

[alexcrichton]

Ah ok, sounds like it's solved!

[robert-w-gries]

I think you misunderstood me. I have to revert to an older rustc nightly in order to build for i686 targets.

The latest rustc nightly does not build compiler_builtins for i686.

[alexcrichton]

Ah sorry indeed! Regardless to compile compiler-builtins you'll need a C compiler as some C shims are compiled. To disable this I believe xargo has necessary support to disable the C shims from being compiled, right?

[robert-w-gries]

I am not sure. There are a lot of layered tools in Rust osdev it's hard to keep track 😄

It sounds like this might be a xargo specific issue. I'll file an issue there and gather more information.

[FenrirWolf]

alloc and a number of other crates in the sysroot now explicitly depend on the version of compiler-builtins that gets built by the compiler-builtins-shim crate. So I think that #![no_std] projects that only use core can use Xargo.toml to configure compiler-builtins to their liking, but if they depend on alloc too then they're stuck with the compiler-builtins features that alloc has enabled.