`blst` fails to build in Windows on ARM device

[jdjaustin]

blst fails to build in Windows on an ARM device. Outuput of cargo build:

error: failed to run custom build command for `blst v0.3.11`

Caused by:
  process didn't exit successfully: `C:\Users\jdjaustin\forest\target\debug\build\blst-f29fbab6336519c1\build-script-build` (exit code: 1)
  --- stdout
  cargo:rustc-cfg=feature="std"
  cargo:rerun-if-env-changed=BLST_TEST_NO_STD
  Using blst source directory C:\Users\jdjaustin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\blst-0.3.11\blst
  cargo:rerun-if-changed=C:\Users\jdjaustin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\blst-0.3.11\blst\src
  cargo:rerun-if-changed=C:\Users\jdjaustin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\blst-0.3.11\blst\build
  Compiling in portable mode without ISA extensions
  TARGET = Some("aarch64-pc-windows-msvc")
  OPT_LEVEL = Some("0")
  HOST = Some("aarch64-pc-windows-msvc")
  cargo:rerun-if-env-changed=CC_aarch64-pc-windows-msvc
  CC_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_aarch64_pc_windows_msvc
  CC_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("neon")
  DEBUG = Some("false")
  cargo:rerun-if-env-changed=CFLAGS_aarch64-pc-windows-msvc
  CFLAGS_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CFLAGS_aarch64_pc_windows_msvc
  CFLAGS_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  cargo:rerun-if-env-changed=CC_aarch64-pc-windows-msvc
  CC_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_aarch64_pc_windows_msvc
  CC_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("neon")
  cargo:rerun-if-env-changed=CFLAGS_aarch64-pc-windows-msvc
  CFLAGS_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CFLAGS_aarch64_pc_windows_msvc
  CFLAGS_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  cargo:rerun-if-env-changed=CC_aarch64-pc-windows-msvc
  CC_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_aarch64_pc_windows_msvc
  CC_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("neon")
  cargo:rerun-if-env-changed=CFLAGS_aarch64-pc-windows-msvc
  CFLAGS_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CFLAGS_aarch64_pc_windows_msvc
  CFLAGS_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  cargo:rerun-if-env-changed=CC_aarch64-pc-windows-msvc
  CC_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_aarch64_pc_windows_msvc
  CC_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("neon")
  cargo:rerun-if-env-changed=CFLAGS_aarch64-pc-windows-msvc
  CFLAGS_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CFLAGS_aarch64_pc_windows_msvc
  CFLAGS_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  cargo:rerun-if-env-changed=CC_aarch64-pc-windows-msvc
  CC_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_aarch64_pc_windows_msvc
  CC_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CC
  HOST_CC = None
  cargo:rerun-if-env-changed=CC
  CC = None
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some("neon")
  cargo:rerun-if-env-changed=CFLAGS_aarch64-pc-windows-msvc
  CFLAGS_aarch64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CFLAGS_aarch64_pc_windows_msvc
  CFLAGS_aarch64_pc_windows_msvc = None
  cargo:rerun-if-env-changed=HOST_CFLAGS
  HOST_CFLAGS = None
  cargo:rerun-if-env-changed=CFLAGS
  CFLAGS = None
  running: "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.37.32822\\bin\\HostX86\\arm64\\cl.exe" "-nologo" "-MD" "-Brepro" "-W4" "-Zl" "-D__BLST_PORTABLE__" "-FoC:\\Users\\jdjaustin\\forest\\target\\debug\\build\\blst-8486b4075c81c52a\\out\\1caae8e62ff2fb2f-server.o" "-c" "C:\\Users\\jdjaustin\\.cargo\\registry\\src\\index.crates.io-6f17d22bba15001f\\blst-0.3.11\\blst\\src\\server.c"
  cargo:warning=The MSVC ARM assemblers do not support -D flags
  server.c
  C:\Users\jdjaustin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\blst-0.3.11\blst\src\vect.h(316): warning C4210: nonstandard extension used: function given file scope
  C:\Users\jdjaustin\.cargo\registry\src\index.crates.io-6f17d22bba15001f\blst-0.3.11\blst\src\vect.h(337): warning C4210: nonstandard extension used: function given file scope
  running: "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.37.32822\\bin\\HostX86\\arm64\\armasm64.exe" "-nologo" "-Zl" "-o" "C:\\Users\\jdjaustin\\forest\\target\\debug\\build\\blst-8486b4075c81c52a\\out\\7069ddadbcadb9b6-add_mod_256-armv8.o" "C:\\Users\\jdjaustin\\.cargo\\registry\\src\\index.crates.io-6f17d22bba15001f\\blst-0.3.11\\blst\\build\\win64\\add_mod_256-armv8.asm"
  cargo:warning=The MSVC ARM assemblers do not support -D flags
  error A2029: unknown command-line argument or argument value -Zl


   Usage:      armasm [<options>] sourcefile objectfile
               armasm [<options>] -o objectfile sourcefile
               armasm -h              for help

  error A2029: unknown command-line argument or argument value -Zl

   Usage:      armasm [<options>] sourcefile objectfile
               armasm [<options>] -o objectfile sourcefile
               armasm -h              for help


  exit code: 1
  cargo:warning=ToolExecError: Command "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.37.32822\\bin\\HostX86\\arm64\\armasm64.exe" "-nologo" "-Zl" "-o" "C:\\Users\\jdjaustin\\forest\\target\\debug\\build\\blst-8486b4075c81c52a\\out\\7069ddadbcadb9b6-mul_mont_384-armv8.o" "C:\\Users\\jdjaustin\\.cargo\\registry\\src\\index.crates.io-6f17d22bba15001f\\blst-0.3.11\\blst\\build\\win64\\mul_mont_384-armv8.asm" with args "armasm64.exe" did not execute successfully (status code exit code: 1).
  exit code: 1
  cargo:warning=ToolExecError: Command "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.37.32822\\bin\\HostX86\\arm64\\armasm64.exe" "-nologo" "-Zl" "-o" "C:\\Users\\jdjaustin\\forest\\target\\debug\\build\\blst-8486b4075c81c52a\\out\\7069ddadbcadb9b6-sha256-armv8.o" "C:\\Users\\jdjaustin\\.cargo\\registry\\src\\index.crates.io-6f17d22bba15001f\\blst-0.3.11\\blst\\build\\win64\\sha256-armv8.asm" with args "armasm64.exe" did not execute successfully (status code exit code: 1).

  --- stderr


  error occurred: Command "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.37.32822\\bin\\HostX86\\arm64\\armasm64.exe" "-nologo" "-Zl" "-o" "C:\\Users\\jdjaustin\\forest\\target\\debug\\build\\blst-8486b4075c81c52a\\out\\7069ddadbcadb9b6-sha256-armv8.o" "C:\\Users\\jdjaustin\\.cargo\\registry\\src\\index.crates.io-6f17d22bba15001f\\blst-0.3.11\\blst\\build\\win64\\sha256-armv8.asm" with args "armasm64.exe" did not execute successfully (status code exit code: 1).


[Finished running. Exit status: 0]

[dot-asm]

Oh! The first aarch64-pc-windows-msvc user! Ever! :-)

Specifically the referred failure is arguably a cc-rs bug, fix is proposed in rust-lang/cc-rs#867. However, even if it's resolved, as it turns out, there will be more errors from armasm64. Yes, it means that build/win64/*-armv8.asm weren't actually tested as they are. Naturally because we never had access to a Windows on ARM system. Either way, src/asm/arm-xlate.pl needs more work, but meanwhile could you take #191 for a spin on your system? You would need to add clang to your VS installation, VS Installer provides the option, and make the clang command available on your %PATH% one way or another. By explicitly modifying your %PATH% or invoking cargo in the "Developer Command Prompt for VS." Yeah, inconvenient, but please bear with me...

[dot-asm]

The rust-lang/cc-rs#867 was merged, but it turned out that further adjustments are required, rust-lang/cc-rs#869. But I've fixed up arm-xlate.pl to make assembly work with ARM assembler, so that clang is no longer required. To use blst till updated blst and cc-rs crates are published create .cargo/config.toml in your project or home directory:

[patch.crates-io]
blst = { git = "https://github.com/supranational/blst" }
cc = { git = "https://github.com/rust-lang/cc-rs" }

[dot-asm]

This is resolved to the extent of Windows on ARM build being exercised on Github Actions.

[dot-asm]

Oh! And thanks for the report!