macOS Big Sur, during CoreFX 3.1: "EXEC : error : include location '/usr/local/include' is unsafe for cross-compilation"

[hrytskivr]

Hey, trying to build on macOS and have this error, no clue what to do.

...
    /Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/build-native.sh x64 Release OSX outconfig netcoreapp-OSX-Release-x64 -portable
    Setting up directories for build
    Checking pre-requisites...
    Commencing build of corefx native components for OSX.x64.Release
    Invoking "/Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/Unix/gen-buildsys-clang.sh" "/Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/Unix" "3" "9" "x64" "RELEASE" " -DFEATURE_DISTRO_AGNOSTIC_SSL=0 -DCMAKE_STATIC_LIB_LINK=0"
    -- Configuring done
    -- Generating done
    -- Build files have been written to: /Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/artifacts/obj/native/netcoreapp-OSX-Release-x64
    Executing make install -j 1
    [ 14%] Built target System.IO.Compression.Native-Static
    [ 28%] Built target System.IO.Compression.Native
    [ 30%] Built target System.IO.Ports.Native
    [ 32%] Built target System.IO.Ports.Native-Static
    [ 33%] Building C object System.Native/CMakeFiles/System.Native-Static.dir/pal_console.c.o
  EXEC : error : include location '/usr/local/include' is unsafe for cross-compilation [-Werror,-Wpoison-system-directories] [/Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/build-native.proj]
  ##vso[task.logissue type=error;sourcepath=EXEC;linenumber=0;columnnumber=0;code=;]include location '/usr/local/include' is unsafe for cross-compilation [-Werror,-Wpoison-system-directories%5D
    1 error generated.
    Failed to build corefx native components.
    make[2]: *** [System.Native/CMakeFiles/System.Native-Static.dir/pal_console.c.o] Error 1
    make[1]: *** [System.Native/CMakeFiles/System.Native-Static.dir/all] Error 2
    make: *** [all] Error 2
  /Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/build-native.proj(36,5): error MSB3073: The command ""/Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/build-native.sh" x64 Release OSX outconfig netcoreapp-OSX-Release-x64 -portable" exited with code 1.
  ##vso[task.logissue type=error;sourcepath=/Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/build-native.proj;linenumber=36;columnnumber=5;code=MSB3073;]The command ""/Users/metal/Downloads/source-build/artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/build-native.sh" x64 Release OSX outconfig netcoreapp-OSX-Release-x64 -portable" exited with code 1.

  Build FAILED.
...

[dagood]

I haven't seen anything like this before, and search results for the error point at cross-architecture compilation scenarios, which seems pretty odd to run into on macOS (without doing so very intentionally). My understanding is it's pretty uniformly x86-64 at the moment.

Can you give some more context about how you're building?

• Where did you download /Users/metal/Downloads/source-build/ from exactly?
• What build command did you run?
• What version of macOS are you using?
• Where did you get the build dependencies you're using?
  • If you can think of a way to summarize this. I'm not the most familiar with macOS setups.

[hrytskivr]

@dagood thanks for reply 👍

1. I downloaded this repo
2. ./build.sh
3. Big Sur Beta (20A5384c)
4. Homebrew package manager

I've managed to overcome this issue by deleting includes from /usr/local/include from this file: ./artifacts/src/corefx.3009a1fc20d9cb47d117399040d31c23f7b23e02/src/Native/Unix/configure.cmake

[dagood]

Interesting... somehow, search wasn't able to find it for me with just the error message, but including Big Sur got me to this issue that appears to be the same as what you hit: dotnet/runtime#41095. It looks like this is a known issue on a Clang 12 beta on macOS. I'd suggest trying to build https://github.com/dotnet/corefx/tree/release/3.1 without source-build (to confirm you also get the problem without the complicated source-build infra involved), and report it on that issue to alert the CoreFX owners.

Once it's fixed in CoreFX (our upstream) we'll get the fix in source-build as part of the next release.

Glad you were able to find a workaround for now, though.

[dagood]

Reopening: I suppose there's no need to close this--it seems like a good idea to keep it open here to track it for anyone hitting it in the future, which is more likely to happen in source-build than CoreFX itself. When Big Sur goes out of beta, this might become higher priority, for example.

[MichaelSimons]

[Triage] MacOS support is being officially added/tracked with #2909