fix(ci): avoid embedding Homebrew libunwind in macOS builds

Author: danieledler

.github/workflows/build.yml

@@ -50,12 +50,7 @@ jobs:
       - if: startsWith(matrix.config.os, 'macos')
         run: |
           brew install llvm libomp
-          BREW_PREFIX="$(brew --prefix)"
-          echo "PATH=$BREW_PREFIX/opt/llvm/bin:${PATH}" >> $GITHUB_ENV
-          echo "CPPFLAGS=-I$BREW_PREFIX/opt/llvm/include -I$BREW_PREFIX/opt/libomp/include" >> $GITHUB_ENV
-          echo "LDFLAGS=-L$BREW_PREFIX/opt/llvm/lib/c++ -L$BREW_PREFIX/opt/llvm/lib/unwind -lunwind -L$BREW_PREFIX/opt/libomp/lib" >> $GITHUB_ENV
-          echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
-          echo "CXX=$BREW_PREFIX/opt/llvm/bin/clang++" >> $GITHUB_ENV
+          make ci-github-env >> $GITHUB_ENV
 
       - run: make -j ${{ matrix.target.target }}
         shell: bash

.github/workflows/python-publish.yml

@@ -67,12 +67,7 @@ jobs:
       - if: startsWith(matrix.config.os, 'macos')
         run: |
           brew install llvm libomp
-          BREW_PREFIX="$(brew --prefix)"
-          echo "PATH=$BREW_PREFIX/opt/llvm/bin:${PATH}" >> $GITHUB_ENV
-          echo "CPPFLAGS=-I$BREW_PREFIX/opt/llvm/include -I$BREW_PREFIX/opt/libomp/include" >> $GITHUB_ENV
-          echo "LDFLAGS=-L$BREW_PREFIX/opt/llvm/lib/c++ -L$BREW_PREFIX/opt/llvm/lib/unwind -lunwind -L$BREW_PREFIX/opt/libomp/lib" >> $GITHUB_ENV
-          echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
-          echo "CXX=$BREW_PREFIX/opt/llvm/bin/clang++" >> $GITHUB_ENV
+          make ci-github-env >> $GITHUB_ENV
       - run: make py-build
         shell: bash
         env:

.github/workflows/release.yml

@@ -57,12 +57,7 @@ jobs:
       - if: startsWith(matrix.config.os, 'macos')
         run: |
           brew install llvm libomp
-          BREW_PREFIX="$(brew --prefix)"
-          echo "PATH=$BREW_PREFIX/opt/llvm/bin:${PATH}" >> $GITHUB_ENV
-          echo "CPPFLAGS=-I$BREW_PREFIX/opt/llvm/include -I$BREW_PREFIX/opt/libomp/include" >> $GITHUB_ENV
-          echo "LDFLAGS=-L$BREW_PREFIX/opt/llvm/lib/c++ -L$BREW_PREFIX/opt/llvm/lib/unwind -lunwind -L$BREW_PREFIX/opt/libomp/lib" >> $GITHUB_ENV
-          echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
-          echo "CXX=$BREW_PREFIX/opt/llvm/bin/clang++" >> $GITHUB_ENV
+          make ci-github-env >> $GITHUB_ENV
 
       - run: make -j ${{ matrix.target.target }}
         shell: bash

Makefile

@@ -344,3 +344,19 @@ print-env:
 	@echo "LDFLAGS=$(LDFLAGS)"
 	@echo "MACOSX_DEPLOYMENT_TARGET=$(MACOSX_DEPLOYMENT_TARGET)"
 	@echo "BREW=$(BREW)"
+
+
+##################################################
+# CI helpers
+##################################################
+
+.PHONY: ci-github-env
+ci-github-env:
+	@BREW="$$(brew --prefix 2>/dev/null || true)"; \
+    if [ -n "$$BREW" ]; then \
+        echo "PATH=$$BREW/opt/llvm/bin:$$PATH"; \
+        echo "CPPFLAGS=$$CPPFLAGS -I$$BREW/opt/llvm/include -I$$BREW/opt/libomp/include"; \
+        echo "LDFLAGS=$$LDFLAGS -L$$BREW/opt/llvm/lib/c++ -L$$BREW/opt/libomp/lib"; \
+        echo "MACOSX_DEPLOYMENT_TARGET=15.0"; \
+        echo "CXX=$$BREW/opt/llvm/bin/clang++"; \
+    fi