nesfab 1.6 (new formula)

[vtbassmatt]

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Adds NESFab. NESFab is a programming language/compiler for creating NES games. It qualifies for inclusion in Homebrew because it's maintained (v1.6 came out within the last week), is known (689 GitHub stars), is used (there has been recent GitHub and Discord activity related to macOS builds), and has a homepage.

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[vtbassmatt]

Hi Homebrew maintainers. I'm feeling stuck after multiple rounds of searching, editing, and resubmitting. I feel like I'm missing something simple.

This project uses a C++20 feature (std::lexicographical_compare_three_way) which Clang apparently didn't fully support until libc++ 17. I searched discussions and found https://github.com/orgs/Homebrew/discussions/5977 which led to #188332, which I aped in my formula:

# ...
  on_macos do
    depends_on "llvm" => :build if DevelopmentTools.clang_build_version <= 1599
  end
# ...
  fails_with :clang do
    build 1599
    cause "Missing std::lexicographical_compare_three_way"
  end

However, the build still fails on macOS 13. (It builds on macOS 15 because I happened to get a successful run there. The PR has always failed before trying macOS 14, so I'm not confident whether it succeeds or fails there.)

I see two paths forward:

• Correct my use of depends_on / fails_with to ensure we get a version of libc++ that works; I need someone with more Clang expertise to point me in the right direction here.
• Remove macOS 13 (and possibly 14?) from the set of supported platforms. Upstream wouldn't build locally (by default) on that/those platforms, so this might also be acceptable.

Thanks for any help you can offer!

[botantony]

@vtbassmatt I think this error happens because it still uses system Clang. Set CXX to the full path to Homebrew's LLVM Clang if clang_build_version is less that 1600

[vtbassmatt]

@vtbassmatt I think this error happens because it still uses system Clang. Set CXX to the full path to Homebrew's LLVM Clang if clang_build_version is less that 1600

Thank you! I see now that the PR I copied from was using CXX=#{ENV.cxx} and I was not. I've kicked another build to see if this does it.

[SMillerDev]

  Failed to execute /opt/homebrew/opt/llvm/bin/clang++ -w -Os -std=c++20 -pthread -Wno-unused-parameter -Wno-unknown-warning-option -Wno-narrowing -Wno-missing-field-initializers -Wno-missing-braces -Wno-unused-command-line-argument -fmax-errors=3 -ftemplate-depth=100 -pipe -Isrc -DVERSION="1.6" -DGIT_COMMIT="da18a43d-homebrew" -DNDEBUG -Wno-unused-variable -c -o obj/token.o src/token.cpp -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk -isystem/opt/homebrew/include -isystem/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers -I/opt/homebrew/opt/icu4c@77/include -I/opt/homebrew/opt/llvm@16/include -fdebug-prefix-map=/private/tmp/nesfab-20250316-8709-5r20tf/nesfab-da18a43dc7b941cc4c56c949303aa37633fdc1b0=.
  
  Xcode and/or the CLT appear to be misconfigured. Try one or both of the following:
    xcodebuild -license
    sudo xcode-select --switch /path/to/Xcode.app

[vtbassmatt]

  Failed to execute /opt/homebrew/opt/llvm/bin/clang++ -w -Os -std=c++20 -pthread -Wno-unused-parameter -Wno-unknown-warning-option -Wno-narrowing -Wno-missing-field-initializers -Wno-missing-braces -Wno-unused-command-line-argument -fmax-errors=3 -ftemplate-depth=100 -pipe -Isrc -DVERSION="1.6" -DGIT_COMMIT="da18a43d-homebrew" -DNDEBUG -Wno-unused-variable -c -o obj/token.o src/token.cpp -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk --sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk -isystem/opt/homebrew/include -isystem/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers -I/opt/homebrew/opt/icu4c@77/include -I/opt/homebrew/opt/llvm@16/include -fdebug-prefix-map=/private/tmp/nesfab-20250316-8709-5r20tf/nesfab-da18a43dc7b941cc4c56c949303aa37633fdc1b0=.
  
  Xcode and/or the CLT appear to be misconfigured. Try one or both of the following:
    xcodebuild -license
    sudo xcode-select --switch /path/to/Xcode.app

Yep, a new hell 😁 because a different thing breaks when I use llvm@latest, so I’m trying to use llvm@16 to match what works on macOS 14 & 15. I had to go to bed so didn’t get a chance to troubleshoot this one last night.

[vtbassmatt]

😭 OK, I'm crying uncle. I cannot seem to get this building on macOS 13.

1. It builds with gcc, but then doesn't link because its dependency (Boost) was built with Clang
   • Possible solution: build Boost myself using GCC (and link statically). This is at odds with https://docs.brew.sh/Acceptable-Formulae#stuff-that-requires-vendored-versions-of-homebrew-formulae. The purity-vs-usefulness distinction offers some leeway to do this, but getting Boost building feels both heavyweight and yak-shave-y.
2. It doesn't build with the macOS 13 default Clang because std::lexicographical_compare_three_way wasn't part of that libc++
   • No solution found: I don't think upstream will accept removing this call. It's part of the C++20 standard, and apparently offers significant runtime savings. Older Clang was not fully implementing the standard yet.
3. It doesn't build with depends_on: 'llvm' (which is @19) because that libc++ removed char_traits<unsigned char>
   • Possible solution: I'm working with upstream to get this fixed. There may still be an onion-peeling exercise to see what else has dropped/changed between Xcode's LLVM on Sequoia and bleeding-edge LLVM.
4. It doesn't build with depends_on: 'llvm@18' (or 17 or 16) because every compiler invocation fails with:

Xcode and/or the CLT appear to be misconfigured. Try one or both of the following:
  xcodebuild -license
  sudo xcode-select --switch /path/to/Xcode.app"

Number 4 perplexes me the most. It actually seems like the correct path forward, if someone can help me understand what I need to do in the Homebrew CI to get this fixed.

• xcodebuild -license requires user-at-keyboard (I think? I couldn't figure out how to do it headless).
• I don't know where to tellxcode-select to look for some different Xcode.
• I tried adding the LDFLAGS suggested in https://formulae.brew.sh/formula/llvm@18, but that didn't fix anything.

Help, please 🙏

[botantony]

@vtbassmatt instead of LDFLAGS try to use this:

ENV.prepend_path "HOMEBREW_LIBRARY_PATHS", Formula["llvm@18"].opt_lib/"c++"

[vtbassmatt]

@vtbassmatt instead of LDFLAGS try to use this:

ENV.prepend_path "HOMEBREW_LIBRARY_PATHS", Formula["llvm@18"].opt_lib/"c++"

Thanks. Gave it a try, and it still failed in the same way. I've cribbed some stuff from the llvm@18 test stanza that I'm trying now:

      toolchain_path = "/Library/Developer/CommandLineTools"
      cpp_base = (MacOS.version >= :big_sur) ? MacOS::CLT.sdk_path : toolchain_path

      system "make", "GIT_COMMIT=#{git_sha}-homebrew", "CXX=#{ENV.cxx}",
             "-isysroot", MacOS::CLT.sdk_path,
             "-isystem", "#{cpp_base}/usr/include/c++/v1",
             "-isystem", "#{MacOS::CLT.sdk_path}/usr/include",
             "-isystem", "#{toolchain_path}/usr/include",
             "release"

though I'm not sure what Make will do with those -isys* lines.

[SMillerDev]

It doesn't build with the macOS 13 default Clang because std::lexicographical_compare_three_way llvm/llvm-project#68591

Seems like the easiest way is declaring that it needs at least macOS 14 to build.

[vtbassmatt]

It doesn't build with the macOS 13 default Clang because std::lexicographical_compare_three_way llvm/llvm-project#68591

Seems like the easiest way is declaring that it needs at least macOS 14 to build.

That's the conclusion I've arrived at as well 🤣. I'm going to try dropping Ventura before I pull any more hair out.

[vtbassmatt]

Appreciate everyone's help getting here! Yup, it turned out that I just needed to say "so long" to Ventura / macOS 13. It builds on 14+.