Unable to cross compile to Openwrt

[Hentioe]

My .cargo/config:

[target.arm-unknown-linux-musleabi]
linker = "arm-openwrt-linux-gcc"

Compile command:

 cargo build --target=arm-unknown-linux-musleabi

Output:

error: failed to run custom build command for `backtrace-sys v0.1.28`
process didn't exit successfully: `/home/data/code/optweaks/target/debug/build/backtrace-sys-6bd48a810fde4c30/build-script-build` (exit code: 101)
--- stdout
cargo:rustc-cfg=rbt
TARGET = Some("arm-unknown-linux-musleabi")
OPT_LEVEL = Some("0")
HOST = Some("x86_64-unknown-linux-gnu")
CC_arm-unknown-linux-musleabi = None
CC_arm_unknown_linux_musleabi = None
TARGET_CC = None
CC = None
CROSS_COMPILE = None
CFLAGS_arm-unknown-linux-musleabi = None
CFLAGS_arm_unknown_linux_musleabi = None
TARGET_CFLAGS = None
CFLAGS = None
running: "arm-linux-musleabi-gcc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-static" "-march=armv6" "-marm" "-mfloat-abi=soft" "-I" "src/libbacktrace" "-I" "/home/data/code/optweaks/target/arm-unknown-linux-musleabi/debug/build/backtrace-sys-31b7a6d9d47eb337/out" "-fvisibility=hidden" "-DBACKTRACE_ELF_SIZE=32" "-DBACKTRACE_SUPPORTED=1" "-DBACKTRACE_USES_MALLOC=1" "-DBACKTRACE_SUPPORTS_THREADS=0" "-DBACKTRACE_SUPPORTS_DATA=0" "-DHAVE_DL_ITERATE_PHDR=1" "-D_GNU_SOURCE=1" "-D_LARGE_FILES=1" "-Dbacktrace_full=__rbt_backtrace_full" "-Dbacktrace_dwarf_add=__rbt_backtrace_dwarf_add" "-Dbacktrace_initialize=__rbt_backtrace_initialize" "-Dbacktrace_pcinfo=__rbt_backtrace_pcinfo" "-Dbacktrace_syminfo=__rbt_backtrace_syminfo" "-Dbacktrace_get_view=__rbt_backtrace_get_view" "-Dbacktrace_release_view=__rbt_backtrace_release_view" "-Dbacktrace_alloc=__rbt_backtrace_alloc" "-Dbacktrace_free=__rbt_backtrace_free" "-Dbacktrace_vector_finish=__rbt_backtrace_vector_finish" "-Dbacktrace_vector_grow=__rbt_backtrace_vector_grow" "-Dbacktrace_vector_release=__rbt_backtrace_vector_release" "-Dbacktrace_close=__rbt_backtrace_close" "-Dbacktrace_open=__rbt_backtrace_open" "-Dbacktrace_print=__rbt_backtrace_print" "-Dbacktrace_simple=__rbt_backtrace_simple" "-Dbacktrace_qsort=__rbt_backtrace_qsort" "-Dbacktrace_create_state=__rbt_backtrace_create_state" "-Dbacktrace_uncompress_zdebug=__rbt_backtrace_uncompress_zdebug""-o" "/home/data/code/optweaks/target/arm-unknown-linux-musleabi/debug/build/backtrace-sys-31b7a6d9d47eb337/out/src/libbacktrace/alloc.o" "-c" "src/libbacktrace/alloc.c"

--- stderr
thread 'main' panicked at '

Internal error occurred: Failed to find tool. Is `arm-linux-musleabi-gcc` installed?

But the compiler I configured is arm-openwrt-linux-gcc, why does it need arm-linux-musleabi-gcc?

[alexcrichton]

Thanks for the report! I think this is unfortunately suffering from rust-lang/cc-rs#82 where the cc crate doesn't ready cargo configuration, so you'll need to also set env vars