Unable to detect compiler error on armv7 build

[andrewdavidmackenzie]

When trying to build ring on my mac, for armv7, with armv gcc tools installed I get this error:

andrew@amackenz-mac ring % cargo build --target=armv7-unknown-linux-gnueabihf                                                                                 
   Compiling ring v0.17.8 (/Users/andrew/workspace/ring)
The following warnings were emitted during compilation:

warning: [email protected]: Compiler family detection failed due to error: ToolExecError: Command "arm-linux-gnueabihf-gcc" "-E" "/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/18273820895658169040detect_compiler_family.c" with args arm-linux-gnueabihf-gcc did not execute successfully (status code exit status: 1).
warning: [email protected]: Compiler family detection failed due to error: ToolExecError: Command "arm-linux-gnueabihf-gcc" "-E" "/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/6396566474068574259detect_compiler_family.c" with args arm-linux-gnueabihf-gcc did not execute successfully (status code exit status: 1).
warning: [email protected]: arm-linux-gnueabihf-gcc: error trying to exec 'cc1': execvp: No such file or directory

error: failed to run custom build command for `ring v0.17.8 (/Users/andrew/workspace/ring)`

Caused by:
  process didn't exit successfully: `/Users/andrew/workspace/ring/target/debug/build/ring-45d5ab41c1bb1a0a/build-script-build` (exit status: 1)
  --- stdout
  cargo:rerun-if-env-changed=CARGO_MANIFEST_DIR
  cargo:rerun-if-env-changed=CARGO_PKG_NAME
  cargo:rerun-if-env-changed=CARGO_PKG_VERSION_MAJOR
  cargo:rerun-if-env-changed=CARGO_PKG_VERSION_MINOR
  cargo:rerun-if-env-changed=CARGO_PKG_VERSION_PATCH
  cargo:rerun-if-env-changed=CARGO_PKG_VERSION_PRE
  cargo:rerun-if-env-changed=CARGO_MANIFEST_LINKS
  cargo:rerun-if-env-changed=RING_PREGENERATE_ASM
  cargo:rerun-if-env-changed=OUT_DIR
  cargo:rerun-if-env-changed=CARGO_CFG_TARGET_ARCH
  cargo:rerun-if-env-changed=CARGO_CFG_TARGET_OS
  cargo:rerun-if-env-changed=CARGO_CFG_TARGET_ENV
  cargo:rerun-if-env-changed=DEBUG
  cargo:rerun-if-env-changed=PERL_EXECUTABLE
  OPT_LEVEL = Some(0)
  OUT_DIR = Some(/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out)
  TARGET = Some(armv7-unknown-linux-gnueabihf)
  HOST = Some(aarch64-apple-darwin)
  cargo:rerun-if-env-changed=CC_armv7-unknown-linux-gnueabihf
  CC_armv7-unknown-linux-gnueabihf = None
  cargo:rerun-if-env-changed=CC_armv7_unknown_linux_gnueabihf
  CC_armv7_unknown_linux_gnueabihf = None
  cargo:rerun-if-env-changed=TARGET_CC
  TARGET_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CROSS_COMPILE
  CROSS_COMPILE = None
  RUSTC_LINKER = None
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:warning=Compiler family detection failed due to error: ToolExecError: Command "arm-linux-gnueabihf-gcc" "-E" "/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/18273820895658169040detect_compiler_family.c" with args arm-linux-gnueabihf-gcc did not execute successfully (status code exit status: 1).
  RUSTC_WRAPPER = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some(true)
  CARGO_CFG_TARGET_FEATURE = None
  cargo:rerun-if-env-changed=CFLAGS_armv7-unknown-linux-gnueabihf
  CFLAGS_armv7-unknown-linux-gnueabihf = None
  cargo:rerun-if-env-changed=CFLAGS_armv7_unknown_linux_gnueabihf
  CFLAGS_armv7_unknown_linux_gnueabihf = None
  cargo:rerun-if-env-changed=TARGET_CFLAGS
  TARGET_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  CARGO_ENCODED_RUSTFLAGS = Some()
  cargo:warning=Compiler family detection failed due to error: ToolExecError: Command "arm-linux-gnueabihf-gcc" "-E" "/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/6396566474068574259detect_compiler_family.c" with args arm-linux-gnueabihf-gcc did not execute successfully (status code exit status: 1).
  cargo:warning=arm-linux-gnueabihf-gcc: error trying to exec 'cc1': execvp: No such file or directory

  --- stderr
  running "perl" "//Users/andrew/workspace/ring/crypto/fipsmodule/aes/asm/bsaes-armv7.pl" "linux32" "//Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/bsaes-armv7-linux32.S"
  running "perl" "//Users/andrew/workspace/ring/crypto/fipsmodule/aes/asm/vpaes-armv7.pl" "linux32" "//Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/vpaes-armv7-linux32.S"
  running "perl" "//Users/andrew/workspace/ring/crypto/fipsmodule/bn/asm/armv4-mont.pl" "linux32" "//Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/armv4-mont-linux32.S"
  running "perl" "//Users/andrew/workspace/ring/crypto/chacha/asm/chacha-armv4.pl" "linux32" "//Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/chacha-armv4-linux32.S"
  running "perl" "//Users/andrew/workspace/ring/crypto/fipsmodule/modes/asm/ghash-armv4.pl" "linux32" "//Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/ghash-armv4-linux32.S"
  running "perl" "//Users/andrew/workspace/ring/crypto/fipsmodule/sha/asm/sha256-armv4.pl" "linux32" "//Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/sha256-armv4-linux32.S"
  running "perl" "//Users/andrew/workspace/ring/crypto/fipsmodule/sha/asm/sha512-armv4.pl" "linux32" "//Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/sha512-armv4-linux32.S"


  error occurred in cc-rs: Command LC_ALL="C" "arm-linux-gnueabihf-gcc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-gdwarf-4" "-fno-omit-frame-pointer" "-march=armv7-a" "-mfpu=vfpv3-d16" "-mfloat-abi=hard" "-I" "/Users/andrew/workspace/ring/include" "-I" "/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out" "-Wall" "-Wextra" "-fvisibility=hidden" "-std=c1x" "-Wall" "-Wbad-function-cast" "-Wcast-align" "-Wcast-qual" "-Wconversion" "-Wmissing-field-initializers" "-Wmissing-include-dirs" "-Wnested-externs" "-Wredundant-decls" "-Wshadow" "-Wsign-compare" "-Wsign-conversion" "-Wstrict-prototypes" "-Wundef" "-Wuninitialized" "-g3" "-Werror" "-o" "/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/25ac62e5b3c53843-curve25519.o" "-c" "/Users/andrew/workspace/ring/crypto/curve25519/curve25519.c" with args arm-linux-gnueabihf-gcc did not execute successfully (status code exit status: 1).

There seems to kind of be two separate possible causes when I dig in a bit:

• Command "arm-linux-gnueabihf-gcc" "-E" "/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/6396566474068574259detect_compiler_family.c" with args arm-linux-gnueabihf-gcc did not execute successfully
• error trying to exec 'cc1': execvp: No such file or directory

Investigating the armv7 tools I have installed:

andrew@amackenz-mac ring % which arm-linux-gnueabihf-gcc
/usr/local/bin/arm-linux-gnueabihf-gcc

So it's installed.

andrew@amackenz-mac ring % file /usr/local/bin/arm-linux-gnueabihf-gcc
/usr/local/bin/arm-linux-gnueabihf-gcc: Mach-O 64-bit executable x86_64

It's a x86_64 binary on my Apple Silicon Mac.
I haven't been able to force homebrew to install arm64 version of those tools yet.

But it seems to run just fine (rosetta...):

andrew@amackenz-mac ring % /usr/local/bin/arm-linux-gnueabihf-gcc --version
arm-linux-gnueabihf-gcc (crosstool-NG 1.24.0) 8.3.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The file that it is trying to compile doesn't exist (I think even generated files should remain after a build fail?):

andrew@amackenz-mac ring % more /Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/6396566474068574259detect_compiler_family.c
/Users/andrew/workspace/ring/target/armv7-unknown-linux-gnueabihf/debug/build/ring-5da4533007b2d19d/out/6396566474068574259detect_compiler_family.c: No such file or directory
andrew@amackenz-mac ring % 

I'm not sure about the " error trying to exec 'cc1': execvp: No such file or directory" error, if it's for real and how I can investigate it more.

Any ideas?