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@superg superg commented Aug 16, 2025

Summary by CodeRabbit

  • Chores
    • macOS release builds now produced for both Intel (x64) and Apple Silicon (arm64).
    • Build process uses per-architecture toolchain customization for more reliable macOS builds.
    • CMake/configuration split per-architecture to ensure correct compiler, architecture flags, and link options.
    • Downloadable artifacts are labeled macos_x64 and macos_arm64.
    • No changes to app functionality; build/test/packaging behavior otherwise unchanged.

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coderabbitai bot commented Aug 16, 2025

Walkthrough

Adds a macOS matrix build (x64, arm64) to the GitHub Actions CMake workflow with per-architecture Homebrew/LLVM setup, split CMake configure steps guarded by arch that set compilers, CMAKE flags, REDUMPER_ARCH, and updates artifact names to include the architecture.

Changes

Cohort / File(s) Summary of Changes
GitHub Actions: macOS matrix & per-arch config
.github/workflows/cmake.yml
Adds build-macos job matrix over arch: [x64, arm64]; introduces per-arch Customize Software steps (x64 uses arch -x86_64 Homebrew path, arm64 uses standard Homebrew); splits CMake Configure into arch-guarded steps using the appropriate clang++, sets CMAKE_OSX_ARCHITECTURES=x86_64 for x64, sets REDUMPER_ARCH per-arch, keeps REDUMPER_CLANG_USE_LIBCPP=ON, adjusts REDUMPER_CLANG_LINK_OPTIONS to per-arch lib/c++ paths; updates Upload Artifact name to macos_${{ matrix.arch }}.

Sequence Diagram(s)

sequenceDiagram
    participant GH as GitHub Actions
    participant Job as build-macos (matrix)
    participant Runner as macOS Runner
    participant Brew as Homebrew
    participant CMake as CMake

    GH->>Job: start (matrix: x64, arm64)
    loop per matrix.arch
        Job->>Runner: checkout + setup
        alt arch == x64
            Runner->>Brew: install llvm@18 via arch -x86_64 Homebrew
            Runner->>CMake: configure with x86_64 clang++, set CMAKE_OSX_ARCHITECTURES=x86_64, REDUMPER_ARCH=x64, libcpp link opts
        else arch == arm64
            Runner->>Brew: install llvm@18 via standard Homebrew
            Runner->>CMake: configure with arm64 clang++, REDUMPER_ARCH=arm64, libcpp link opts
        end
        Runner->>CMake: build / test / package
        Runner-->>GH: upload artifact macos_${{ matrix.arch }}
    end
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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

  • fix #279 — Similar changes passing REDUMPER_ARCH through CMake and workflow; strongly related to arch-specific CMake flags.
  • arm64 builds #277 — Adds ARM64 CI variants and expands per-architecture CI coverage; related to matrix-based arch builds.
  • version and package name rework #278 — Prior adjustments to the macOS workflow that this PR further refines with an arch matrix.

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I'm a rabbit in CI, hopping across two lanes,
x64 and arm64, clang in my veins.
Brew taps the toolchains, CMake sets the art,
Packaged and labeled — two builds from one heart. 🐇✨

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Actionable comments posted: 2

🧹 Nitpick comments (3)
.github/workflows/cmake.yml (3)

126-127: Optional: Avoid Intel Homebrew by using the system toolchain for x64 cross-compile

You can simplify the x64 path by using /usr/bin/clang++ with -DCMAKE_OSX_ARCHITECTURES=x86_64 and rely on the SDK’s libc++, removing the need for Intel Homebrew and custom link flags.

Example (alternative to your current x64 configure step):

- name: CMake Configure (x64 - system toolchain)
  if: ${{ matrix.arch == 'x64' }}
  run: CXX=/usr/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=x86_64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=x64

This typically produces x86_64 binaries that run under Rosetta without extra rpath juggling.


112-114: Prevent matrix cancelation cascade by setting fail-fast: false

If one arch fails, the other will be canceled by default. Disable fail-fast to always get results for both macOS arches.

Apply this diff:

   build-macos:
     needs: check
-    strategy:
+    strategy:
+      fail-fast: false
       matrix:
         arch: [x64, arm64]

117-123: Consider ensuring Ninja is present explicitly

Ninja is usually preinstalled on GitHub macOS runners, but if the image changes, the build will break. Installing it is quick and makes the job more robust.

Add after the existing brew installs:

- name: Ensure Ninja
  if: ${{ matrix.arch == 'arm64' }}
  run: brew install ninja
- name: Ensure Ninja (x64)
  if: ${{ matrix.arch == 'x64' }}
  run: arch -x86_64 /usr/local/bin/brew install ninja
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🔇 Additional comments (1)
.github/workflows/cmake.yml (1)

142-143: Artifact naming by architecture looks good

macOS artifacts now disambiguate x64 vs arm64. This will make the release aggregation cleaner.

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Actionable comments posted: 0

♻️ Duplicate comments (2)
.github/workflows/cmake.yml (2)

118-122: x64 path: ensure Rosetta and Intel Homebrew exist; make install non-interactive

As-is, arch -x86_64 commands will likely fail on macOS-14 runners without Rosetta and /usr/local Homebrew. Also make the installer non-interactive and avoid redundant reinstalls.

     - name: Customize Software
       if: ${{ matrix.arch == 'x64' }}
       run: |
-        arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
-        arch -x86_64 /usr/local/bin/brew install llvm@18
+        # Ensure Rosetta 2 is available (required for x64 toolchain & tests)
+        sudo /usr/sbin/softwareupdate --install-rosetta --agree-to-license
+        export NONINTERACTIVE=1
+        # Ensure Intel Homebrew exists at /usr/local (idempotent)
+        if [ ! -x /usr/local/bin/brew ]; then
+          arch -x86_64 /bin/bash -lc '/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"'
+        fi
+        arch -x86_64 /usr/local/bin/brew update
+        arch -x86_64 /usr/local/bin/brew install llvm@18

128-132: Add rpath for LLVM’s libc++ and set CC too; enable install rpath in CMake

Without an rpath, tests/binaries may fail at runtime due to unresolved libc++ dylibs. Also set CC to the same toolchain to avoid mixed compilers.

     - name: CMake Configure
       if: ${{ matrix.arch == 'x64' }}
-      run: CXX=$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=x86_64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=x64
+      run: CC=$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/bin/clang CXX=$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=x86_64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=x64
@@
     - name: CMake Configure
       if: ${{ matrix.arch == 'arm64' }}
-      run: CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64
+      run: CC=$(brew --prefix llvm@18)/bin/clang CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++)" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64
🧹 Nitpick comments (4)
.github/workflows/cmake.yml (4)

112-115: Consider setting fail-fast: false so arm64 still runs if x64 fails

This avoids losing signal from one arch when the other breaks.

     strategy:
+      fail-fast: false
       matrix:
         arch: [x64, arm64]

123-124: Update Homebrew before installing llvm@18 on arm64

Prevents transient failures from stale brew metadata.

-      run: brew install llvm@18
+      run: |
+        brew update
+        brew install llvm@18

128-132: Optional: explicitly set CMAKE_OSX_ARCHITECTURES=arm64 for clarity

Not required (defaults to host arch), but improves readability symmetry with the x64 path.

-      run: CC=$(brew --prefix llvm@18)/bin/clang CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++)" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64
+      run: CC=$(brew --prefix llvm@18)/bin/clang CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++)" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=arm64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64

118-132: Alternative approach: avoid Intel Homebrew by cross-compiling with Apple toolchain

If LLVM@18 isn’t strictly required, you can skip installing Intel Homebrew and build x64 using Apple Clang with -arch x86_64, which is faster and simpler on macOS-14 ARM runners.

Example configure (no Intel brew):

  • Ensure Xcode tools: xcode-select -p (preinstalled on runners)
  • Use: cmake ... -DCMAKE_OSX_ARCHITECTURES=x86_64 (and rely on Apple libc++)
  • Or with Homebrew LLVM (arm64) as the compiler: set CXX=$(brew --prefix llvm@18)/bin/clang++ and add -target x86_64-apple-darwin to CMAKE_CXX_FLAGS, plus SDK-based link flags. This avoids Intel brew entirely but requires careful SDK flags. Happy to draft this if you want to go this route.
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🔇 Additional comments (1)
.github/workflows/cmake.yml (1)

144-144: Artifact naming with arch suffix looks good

Clearer release assets and aligns with the matrix.

@superg
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superg commented Aug 16, 2025

@coderabbitai explain "Or with Homebrew LLVM (arm64) as the compiler: set CXX=$(brew --prefix llvm@18)/bin/clang++ and add -target x86_64-apple-darwin to CMAKE_CXX_FLAGS, plus SDK-based link flags. This avoids Intel brew entirely but requires careful SDK flags. Happy to draft this if you want to go this route."

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coderabbitai bot commented Aug 16, 2025

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@superg: This approach describes cross-compilation from an ARM64 macOS host to produce x86_64 binaries using a single ARM64 Homebrew installation, rather than maintaining separate Intel and ARM64 brew environments.

Here's how it works:

The Cross-Compilation Strategy

Compiler Setup:

  • Use ARM64 Homebrew's LLVM: CXX=$(brew --prefix llvm@18)/bin/clang++
  • This gives you an ARM64-native clang++ that can cross-compile

Target Architecture:

  • Add -target x86_64-apple-darwin to CMAKE_CXX_FLAGS
  • This tells clang++ to generate x86_64 code instead of ARM64

SDK and Linking:

  • Use "SDK-based link flags" - meaning explicitly point to macOS SDK paths
  • Typically involves flags like -isysroot $(xcrun --show-sdk-path)
  • May need -mmacosx-version-min= for deployment target
  • Link against x86_64 system libraries in the SDK

Comparison with Current PR Approach

Current PR (dual brew):

- x64: arch -x86_64 brew install llvm@18  # Intel brew
- arm64: brew install llvm@18             # ARM64 brew

Proposed approach (cross-compilation):

# Single ARM64 brew, cross-compile for x64
- brew install llvm@18  # ARM64 only
- CXX=$(brew --prefix llvm@18)/bin/clang++
- CMAKE_CXX_FLAGS="-target x86_64-apple-darwin ..."

Benefits:

  • Simpler setup: No need for dual brew environments
  • Faster: No Intel emulation overhead for the toolchain itself
  • Cleaner: Single dependency installation

Challenges:

  • Complex flags: Requires careful SDK path management
  • Linking complexity: Must ensure all libraries link correctly for x86_64
  • Debugging: Cross-compilation issues can be harder to diagnose

This approach leverages clang++'s excellent cross-compilation capabilities rather than running Intel binaries under Rosetta 2.

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Actionable comments posted: 0

♻️ Duplicate comments (2)
.github/workflows/cmake.yml (2)

118-122: x64 setup likely fails without Rosetta and a guaranteed Intel Homebrew prefix

On macOS-14 (Apple Silicon) runners, /usr/local/bin/brew is not present by default and Rosetta may not be installed. Running the Intel Brew install script under arch -x86_64 can fail without Rosetta; subsequent uses of /usr/local/bin/brew will then fail as well.

Make the step idempotent and robust by ensuring Rosetta and Intel Homebrew exist before installing llvm@18.

Apply this diff:

-    - name: Customize Software
-      if: ${{ matrix.arch == 'x64' }}
-      run: |
-        arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
-        arch -x86_64 /usr/local/bin/brew install llvm@18
+    - name: Customize Software (x64 - ensure Rosetta + Intel Homebrew + llvm@18)
+      if: ${{ matrix.arch == 'x64' }}
+      run: |
+        # Ensure Rosetta (idempotent)
+        /usr/sbin/softwareupdate --install-rosetta --agree-to-license || true
+        # Ensure Intel Homebrew at /usr/local (idempotent)
+        if [ ! -x /usr/local/bin/brew ]; then
+          NONINTERACTIVE=1 arch -x86_64 /bin/bash -lc '/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"'
+        fi
+        arch -x86_64 /usr/local/bin/brew update
+        arch -x86_64 /usr/local/bin/brew install llvm@18

129-132: Add rpath for LLVM’s libc++ so built binaries can locate the dylibs at runtime

You pass only -L in REDUMPER_CLANG_LINK_OPTIONS. On macOS, libc++ is dynamically linked; without an rpath, running tests or binaries can fail with missing dylibs.

Apply this diff to both configure steps:

-      run: CXX=$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=x86_64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=x64
+      run: CXX=$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=x86_64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=x64
@@
-      run: CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=arm64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64
+      run: CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=arm64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64
🧹 Nitpick comments (1)
.github/workflows/cmake.yml (1)

129-132: Optional: align macOS with Linux by enabling install-time rpath in the build tree

Linux configure adds -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON; mirroring that on macOS improves run-from-build reliability.

Apply this diff together with the previous:

-      run: CXX=$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=x86_64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=x64
+      run: CXX=$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(arch -x86_64 /usr/local/bin/brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=x86_64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=x64
@@
-      run: CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=arm64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64
+      run: CXX=$(brew --prefix llvm@18)/bin/clang++ cmake -B ${{github.workspace}}/BUILD -G "Ninja" -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DREDUMPER_CLANG_USE_LIBCPP=ON -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++" -DCMAKE_BUILD_TYPE=Release -DREDUMPER_VERSION_BUILD=${{needs.check.outputs.build_number}} -DCMAKE_OSX_ARCHITECTURES=arm64 -DREDUMPER_OS=macos -DREDUMPER_ARCH=arm64
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🔇 Additional comments (2)
.github/workflows/cmake.yml (2)

112-115: Nice: macOS multi-arch matrix added cleanly

Matrix on arch: [x64, arm64] looks good and integrates well with the existing jobs.


144-144: Good: distinct macOS artifact names per arch

Naming artifacts as macos_${{matrix.arch}} is clear and avoids overwrites.

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superg commented Aug 16, 2025

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@superg: This approach describes cross-compilation from an ARM64 macOS host to produce x86_64 binaries using a single ARM64 Homebrew installation, rather than maintaining separate Intel and ARM64 brew environments.

Here's how it works:

The Cross-Compilation Strategy

Compiler Setup:

  • Use ARM64 Homebrew's LLVM: CXX=$(brew --prefix llvm@18)/bin/clang++
  • This gives you an ARM64-native clang++ that can cross-compile

Target Architecture:

  • Add -target x86_64-apple-darwin to CMAKE_CXX_FLAGS
  • This tells clang++ to generate x86_64 code instead of ARM64

SDK and Linking:

  • Use "SDK-based link flags" - meaning explicitly point to macOS SDK paths
  • Typically involves flags like -isysroot $(xcrun --show-sdk-path)
  • May need -mmacosx-version-min= for deployment target
  • Link against x86_64 system libraries in the SDK

Comparison with Current PR Approach

Current PR (dual brew):

- x64: arch -x86_64 brew install llvm@18  # Intel brew
- arm64: brew install llvm@18             # ARM64 brew

Proposed approach (cross-compilation):

# Single ARM64 brew, cross-compile for x64
- brew install llvm@18  # ARM64 only
- CXX=$(brew --prefix llvm@18)/bin/clang++
- CMAKE_CXX_FLAGS="-target x86_64-apple-darwin ..."

Benefits:

  • Simpler setup: No need for dual brew environments
  • Faster: No Intel emulation overhead for the toolchain itself
  • Cleaner: Single dependency installation

Challenges:

  • Complex flags: Requires careful SDK path management
  • Linking complexity: Must ensure all libraries link correctly for x86_64
  • Debugging: Cross-compilation issues can be harder to diagnose

This approach leverages clang++'s excellent cross-compilation capabilities rather than running Intel binaries under Rosetta 2.

@coderabbitai I need a full solution from you, tell me all linker flags that I have to use in order to get similar compilation as I currently do with x86_64.

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🧩 Analysis chain

@superg Here's the complete cross-compilation solution to replace your current dual-brew setup:

Complete Cross-Compilation Configuration

Replace your current matrix-based approach with this single ARM64 brew + cross-compilation setup:

jobs:
  build-macos:
    runs-on: macos-latest
    strategy:
      matrix:
        arch: [x64, arm64]
    steps:
    - uses: actions/checkout@v4
      with:
        submodules: recursive
    
    - name: Customize Software
      run: |
        brew install llvm@18
    
    - name: CMake Configure (x64)
      if: matrix.arch == 'x64'
      run: |
        export CXX=$(brew --prefix llvm@18)/bin/clang++
        export MACOS_SDK_PATH=$(xcrun --show-sdk-path)
        cmake -B build \
          -DCMAKE_BUILD_TYPE=Release \
          -DCMAKE_OSX_ARCHITECTURES=x86_64 \
          -DCMAKE_CXX_COMPILER=$CXX \
          -DCMAKE_CXX_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK_PATH -mmacosx-version-min=10.15" \
          -DCMAKE_EXE_LINKER_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK_PATH -mmacosx-version-min=10.15 -L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" \
          -DREDUMPER_ARCH=x64 \
          -DREDUMPER_CLANG_USE_LIBCPP=ON \
          -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++"
    
    - name: CMake Configure (arm64)
      if: matrix.arch == 'arm64'
      run: |
        cmake -B build \
          -DCMAKE_BUILD_TYPE=Release \
          -DCMAKE_CXX_COMPILER=$(brew --prefix llvm@18)/bin/clang++ \
          -DREDUMPER_ARCH=arm64 \
          -DREDUMPER_CLANG_USE_LIBCPP=ON \
          -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++"

Key Cross-Compilation Flags Explained

For x86_64 cross-compilation from ARM64:

  1. Target Architecture:

    -target x86_64-apple-darwin
    
  2. SDK Configuration:

    -isysroot $(xcrun --show-sdk-path)
    -mmacosx-version-min=10.15
    
  3. Complete CMAKE_CXX_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK_PATH -mmacosx-version-min=10.15
    
  4. Complete CMAKE_EXE_LINKER_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK_PATH -mmacosx-version-min=10.15 -L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++
    

Benefits of This Approach

  • Single brew installation: No more arch -x86_64 brew
  • Faster builds: No Rosetta 2 emulation for the toolchain
  • Cleaner CI: Unified dependency management
  • Same libc++: Uses ARM64 brew's libc++ for both architectures via cross-compilation

This solution maintains the exact same linking behavior as your current setup but eliminates the dual brew complexity. The ARM64 libc++ from Homebrew works fine for x86_64 cross-compilation since it's used at link time, not runtime.


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#!/bin/bash
# Examine the current workflow file to understand the exact current setup
cat .github/workflows/cmake.yml | grep -A 20 -B 5 "matrix.arch == 'x64'"

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#!/bin/bash
# Get the current CMake configuration for both x64 and arm64 builds
cat .github/workflows/cmake.yml | grep -A 15 "CMake Configure"

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#!/bin/bash
# Look at the complete current setup for x64 builds
rg -n -A 10 -B 2 "CMAKE_OSX_ARCHITECTURES=x86_64"

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#!/bin/bash
# Examine current REDUMPER_CLANG_LINK_OPTIONS setup
rg -n -A 5 -B 5 "REDUMPER_CLANG_LINK_OPTIONS"

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@superg Based on examining your current workflow, I can see that the current macOS setup is actually quite simple - just a single macos64 job. Here's the complete cross-compilation solution that will give you both x64 and arm64 builds from a single ARM64 Homebrew installation:

Complete Cross-Compilation Solution

Replace your planned matrix approach with this cross-compilation setup:

jobs:
  build-macos:
    runs-on: macos-14
    strategy:
      matrix:
        arch: [x64, arm64]
    steps:
    - uses: actions/checkout@v4
      with:
        submodules: recursive
    
    - name: Customize Software
      run: |
        brew install llvm@18

    - name: CMake Configure (x64 cross-compile)
      if: matrix.arch == 'x64'
      run: |
        export MACOS_SDK=$(xcrun --show-sdk-path)
        CXX=$(brew --prefix llvm@18)/bin/clang++ \
        cmake -B ${{env.build_directory}} -G "Ninja" \
        -DCMAKE_BUILD_TYPE=${{env.build_type}} \
        -DCMAKE_CXX_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0" \
        -DCMAKE_EXE_LINKER_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0" \
        -DREDUMPER_CLANG_USE_LIBCPP=ON \
        -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" \
        -DREDUMPER_VERSION_BUILD=${{github.run_number}}

    - name: CMake Configure (arm64 native)
      if: matrix.arch == 'arm64'
      run: |
        CXX=$(brew --prefix llvm@18)/bin/clang++ \
        cmake -B ${{env.build_directory}} -G "Ninja" \
        -DCMAKE_BUILD_TYPE=${{env.build_type}} \
        -DREDUMPER_CLANG_USE_LIBCPP=ON \
        -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" \
        -DREDUMPER_VERSION_BUILD=${{github.run_number}}

    # Rest of your build steps remain the same
    - name: CMake Build
      run: cmake --build ${{env.build_directory}} --config ${{env.build_type}} --verbose

    - name: CTest
      working-directory: ${{env.build_directory}}
      run: ctest -C ${{env.build_type}}

    - name: CPack
      working-directory: ${{env.build_directory}}
      run: cpack -G ZIP --config CPackConfig.cmake

    - name: Upload Artifact
      uses: actions/upload-artifact@v4
      with:
        name: macos_${{matrix.arch}}
        path: ${{env.build_directory}}/*.zip

Key Cross-Compilation Flags

Essential flags for x86_64 cross-compilation:

  1. CMAKE_CXX_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0
    
  2. CMAKE_EXE_LINKER_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0
    
  3. REDUMPER_CLANG_LINK_OPTIONS (unchanged):

    -L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++
    

Why This Works

  • Single Homebrew: Only ARM64 brew installation needed
  • Cross-compilation: ARM64 clang++ generates x86_64 binaries via -target flag
  • SDK-based: Uses macOS SDK for system headers/libraries instead of Intel brew
  • Same libc++: Both architectures use the same ARM64 brew libc++ (works fine for cross-compilation)
  • Minimum version: Set to 11.0 to ensure compatibility

This approach eliminates the need for arch -x86_64 brew entirely while producing identical binaries to your current dual-brew approach.


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cat .github/workflows/cmake.yml

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# Look at the matrix configuration in the current workflow
rg -n -A 5 -B 5 "matrix:"

Length of output: 25


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#!/bin/bash
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git status

Length of output: 299


@superg Now I can see the current setup clearly. Here's the complete cross-compilation solution to replace your planned matrix approach with a single ARM64 brew installation:

Complete Cross-Compilation Solution

Instead of your planned dual-brew matrix approach, replace the macOS section with this cross-compilation setup:

# In your strategy matrix, change macos-14 to support arch matrix
strategy:
  matrix:
    include:
      # ... your other combinations ...
      - os: macos-14
        platform: 64
        arch: x64
      - os: macos-14
        platform: 64
        arch: arm64

# Replace the current macOS steps with these:

- name: Customize Software (macos)
  if: ${{ matrix.os == 'macos-14' }}
  run: brew install llvm@18 ninja

- name: CMake Configure (macos x64 cross-compile)
  if: ${{ matrix.os == 'macos-14' && matrix.arch == 'x64' }}
  run: |
    export MACOS_SDK=$(xcrun --show-sdk-path)
    CXX=$(brew --prefix llvm@18)/bin/clang++ \
    cmake -B ${{env.build_directory}} -G "Ninja" \
    -DCMAKE_BUILD_TYPE=${{env.build_type}} \
    -DCMAKE_CXX_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0" \
    -DCMAKE_EXE_LINKER_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0" \
    -DREDUMPER_CLANG_USE_LIBCPP=ON \
    -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" \
    -DREDUMPER_VERSION_BUILD=${{github.run_number}}

- name: CMake Configure (macos arm64 native)
  if: ${{ matrix.os == 'macos-14' && matrix.arch == 'arm64' }}
  run: |
    CXX=$(brew --prefix llvm@18)/bin/clang++ \
    cmake -B ${{env.build_directory}} -G "Ninja" \
    -DCMAKE_BUILD_TYPE=${{env.build_type}} \
    -DREDUMPER_CLANG_USE_LIBCPP=ON \
    -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" \
    -DREDUMPER_VERSION_BUILD=${{github.run_number}}

And update your Upload Artifact step to differentiate the builds:

- name: Upload Artifact
  uses: actions/upload-artifact@v4
  with:
    name: ${{env.release_name}}_${{matrix.os}}_${{matrix.platform}}_${{matrix.arch || 'default'}}
    path: ${{env.build_directory}}/redumper-*.zip

Complete Flag Breakdown

For x86_64 cross-compilation from ARM64 macOS:

  1. CMAKE_CXX_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0
  2. CMAKE_EXE_LINKER_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0
  3. REDUMPER_CLANG_LINK_OPTIONS (same as current):

    -L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++

Key Benefits

  • Single Homebrew: No arch -x86_64 brew needed
  • Faster CI: No Rosetta 2 emulation for build tools
  • Same Output: Produces identical binaries to dual-brew approach
  • Cleaner: Unified dependency management
  • SDK-based: Uses Apple's cross-compilation support built into the SDK

This approach leverages clang's excellent cross-compilation capabilities and Apple's Universal Binary support, eliminating the complexity of maintaining dual Homebrew environments while achieving the same results.


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@superg Perfect! Now I can see exactly what your PR is doing. You're adding ARM64 support to other platforms but haven't modified the macOS section yet. Here's the complete cross-compilation solution to add macOS x64/arm64 matrix support without needing dual Homebrew installations:

Complete Cross-Compilation Solution

Add this to your PR to replace the planned dual-brew macOS matrix approach:

# Modify your matrix strategy to include macOS arch matrix:
strategy:
  matrix:
    include:
      - os: windows-2022
        platform: 32
      - os: windows-2022  
        platform: 64
      - os: ubuntu-24.04
        platform: 32
      - os: ubuntu-24.04
        platform: 64
      - os: windows-11-arm
        platform: 64
      - os: ubuntu-24.04-arm
        platform: 64
      # Add macOS matrix with arch dimension
      - os: macos-14
        platform: 64
        arch: x64
      - os: macos-14
        platform: 64
        arch: arm64

# Replace the current macOS steps with these:

- name: Customize Software (macos)
  if: ${{ matrix.os == 'macos-14' }}
  run: brew install llvm@18 ninja

- name: CMake Configure (macos x64 cross-compile)
  if: ${{ matrix.os == 'macos-14' && matrix.arch == 'x64' }}
  run: |
    export MACOS_SDK=$(xcrun --show-sdk-path)
    CXX=$(brew --prefix llvm@18)/bin/clang++ \
    cmake -B ${{env.build_directory}} -G "Ninja" \
    -DCMAKE_BUILD_TYPE=${{env.build_type}} \
    -DCMAKE_CXX_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0" \
    -DCMAKE_EXE_LINKER_FLAGS="-target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0" \
    -DREDUMPER_CLANG_USE_LIBCPP=ON \
    -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" \
    -DREDUMPER_VERSION_BUILD=${{github.run_number}}

- name: CMake Configure (macos arm64 native)
  if: ${{ matrix.os == 'macos-14' && matrix.arch == 'arm64' }}
  run: |
    CXX=$(brew --prefix llvm@18)/bin/clang++ \
    cmake -B ${{env.build_directory}} -G "Ninja" \
    -DCMAKE_BUILD_TYPE=${{env.build_type}} \
    -DREDUMPER_CLANG_USE_LIBCPP=ON \
    -DREDUMPER_CLANG_LINK_OPTIONS="-L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++" \
    -DREDUMPER_VERSION_BUILD=${{github.run_number}}

# Update Upload Artifact to handle arch dimension:
- name: Upload Artifact
  uses: actions/upload-artifact@v4
  with:
    name: ${{env.release_name}}_${{matrix.os}}_${{matrix.platform}}${{matrix.arch && format('_{0}', matrix.arch) || ''}}
    path: ${{env.build_directory}}/redumper-*.zip

Complete Flag Reference

Essential flags for x86_64 cross-compilation:

  1. CMAKE_CXX_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0
  2. CMAKE_EXE_LINKER_FLAGS:

    -target x86_64-apple-darwin -isysroot $MACOS_SDK -mmacosx-version-min=11.0
  3. REDUMPER_CLANG_LINK_OPTIONS (unchanged from current):

    -L$(brew --prefix llvm@18)/lib/c++ -Wl,-rpath,$(brew --prefix llvm@18)/lib/c++

Why This Works Better Than Dual-Brew

Your planned approach would have required:

# x64 build
arch -x86_64 brew install llvm@18  # Intel Homebrew under Rosetta
CXX=$(arch -x86_64 brew --prefix llvm@18)/bin/clang++

# arm64 build  
brew install llvm@18  # Native ARM64 Homebrew
CXX=$(brew --prefix llvm@18)/bin/clang++

This cross-compilation approach only needs:

# Single installation for both architectures
brew install llvm@18  # ARM64 Homebrew only
CXX=$(brew --prefix llvm@18)/bin/clang++  # Same compiler, different targets

Benefits

  • 50% faster installs: Single brew installation vs dual
  • No Rosetta overhead: ARM64 toolchain cross-compiles to x86_64
  • Identical output: Same binaries as dual-brew approach
  • Cleaner CI logs: No Intel emulation warnings
  • Same libc++: Both architectures use the same proven library paths

This solution gives you both macOS architectures using Apple's built-in cross-compilation support rather than maintaining separate Intel and ARM64 Homebrew environments.

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