WIP: Extend CI infrastructure to build macOS wheels

.github/workflows/build_wheels.yml

@@ -5,18 +5,21 @@ on: [push, pull_request]
 # versions and macOS / Windows.
 
 jobs:
-  build_wheels_linux:
-    name: Build Linux wheels
-    # The Docker container the job is run in.
-    container: quay.io/pypa/manylinux2014_x86_64
+  build_wheels:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    name: Build wheels
     # The host system that runs Docker.
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    # The Docker container the job is run in.
+    container: ${{ matrix.os == 'ubuntu-latest' && 'quay.io/pypa/manylinux2014_x86_64' || null }}
     steps:
       - uses: actions/checkout@v3
       - uses: conda-incubator/setup-miniconda@v2
         with:
           miniconda-version: latest
-          environment-file: ci/environment/conda-linux-64.lock
+          environment-file: ${{ matrix.os == 'ubuntu-latest' && 'ci/environment/conda-linux-64.lock' || 'ci/environment/conda-osx-64.lock' }}
       - name: Build the wheels
         # The following line here and elsewhere is needed for our Conda environment to
         # be activated. See:

ci/build.sh

@@ -17,14 +17,21 @@ RPATH_OPTION="-Wl,-rpath,'\$ORIGIN',--disable-new-dtags"
 # Shell quoting madness to survive through qmake and make ...
 RPATH_OPTION_2="-Wl,-rpath,'\\'\\\$\\\$ORIGIN\\'',--disable-new-dtags"
 
+if [ "$OSTYPE" == "linux-gnu" ]; then
+    export LIBRARY_PATH=$CONDA_BUILD_SYSROOT/lib:$CONDA_PREFIX/lib
+else # macOS
+    export LIBRARY_PATH=$CONDA_PREFIX/lib
+    export MACOSX_DEPLOYMENT_TARGET=11.0
+fi
+
 # Download and extract the Poppler source code
 
 POPPLER=poppler-$POPPLER_VERSION
 curl -O https://poppler.freedesktop.org/$POPPLER.tar.xz
-tar -xf $POPPLER.tar.xz
+tar -xvf $POPPLER.tar.xz
 # Patch Poppler to avoid building the tests. Newer Poppler versions have a config
 # variable for this.
-sed -i 's/add_subdirectory(test)//g' $POPPLER/CMakeLists.txt
+sed -iback 's/add_subdirectory(test)//g' $POPPLER/CMakeLists.txt
 
 
 pushd $POPPLER
@@ -61,10 +68,12 @@ CMAKE_OPTIONS+=" -DBUILD_QT5_TESTS=OFF"
 # Install locally
 CMAKE_OPTIONS+=" -DCMAKE_INSTALL_PREFIX==../../../installed-poppler"
 
+if [ "$OSTYPE" == "linux-gnu" ]; then
+    export LDFLAGS=$RPATH_OPTION
+fi
+
 # Generate Poppler Makefile
-LDFLAGS=$RPATH_OPTION \
 PKG_CONFIG_LIBDIR=$CONDA_PREFIX/lib/pkgconfig \
-LIBRARY_PATH=$CONDA_BUILD_SYSROOT/lib:$CONDA_PREFIX/lib \
     cmake -S . -B build $CMAKE_OPTIONS
 
 # Build Poppler
@@ -73,23 +82,44 @@ make -j$(nproc)
 make install
 popd
 
+export -n LDFLAGS
+
 popd
 
 # Now build python-poppler-qt5. Add a RUNPATH just like for poppler.
-PKG_CONFIG_LIBDIR=installed-poppler/lib64/pkgconfig:$CONDA_PREFIX/lib/pkgconfig \
-LIBRARY_PATH=$CONDA_BUILD_SYSROOT/lib:$CONDA_PREFIX/lib \
-    sip-wheel --verbose --link-args=$RPATH_OPTION_2 --build-dir=build
+if [ "$OSTYPE" == "linux-gnu" ]; then
+    SIP_EXTRA_ARGS="--link-args=$RPATH_OPTION_2"
+    POPPLER_LIB_DIR=installed-poppler/lib64
+else
+    SIP_EXTRA_ARGS=
+    POPPLER_LIB_DIR=installed-poppler/lib
+fi
+
+PKG_CONFIG_LIBDIR=$POPPLER_LIB_DIR/pkgconfig:$CONDA_PREFIX/lib/pkgconfig \
+    sip-wheel --verbose $SIP_EXTRA_ARGS --build-dir=build
 
 # Unpack wheel to tinker with it
 WHEEL=(python_poppler_qt5*.whl)
-wheel unpack $WHEEL
+wheel unpack "$WHEEL"
 pushd python_poppler_qt5-$PYTHON_POPPLER_QT5_VERSION
 
 # Vendor libopenjp2 and libjpeg
-cp ../installed-poppler/lib64/*.so* \
-   $CONDA_PREFIX/lib/libopenjp2.so* \
-   $CONDA_PREFIX/lib/libjpeg.so* \
-   PyQt5/Qt5/lib/
+if [ "$OSTYPE" == "linux-gnu" ]; then
+    LIB_FILES="../$POPPLER_LIB_DIR/*.so* $CONDA_PREFIX/lib/libopenjp2.so* $CONDA_PREFIX/lib/libjpeg.so*"
+else
+    LIB_FILES="../$POPPLER_LIB_DIR/*.dylib* $CONDA_PREFIX/lib/libopenjp2.dylib* $CONDA_PREFIX/lib/libjpeg.dylib*"
+fi
+
+cp $LIB_FILES PyQt5/Qt5/lib/
+
+pushd PyQt5/Qt5/lib
+if [ "$OSTYPE" != "linux-gnu" ]; then
+    for file in _popplerqt5*.so libpoppler*.dylib; do
+        install_name_tool -delete_rpath "$CONDA_PREFIX/lib" "$file"
+        install_name_tool -add_rpath "@loader_path" "$file"
+    done
+fi
+popd
 
 # Repack the wheel
 popd