build(macos): Enable cross compiling libpq across macOS architectures

The GitHub Actions runners look like they're only 1 year away from the
last macOS x86_64 platform being removed. Get ahead of the game and
build x86_64 on arm64.

.github/workflows/packages.yml

@@ -132,29 +132,15 @@ jobs:
   # }}}
 
   macos:  # {{{
-    runs-on: macos-${{ matrix.macver }}
+    runs-on: macos-latest
     if: true
 
     strategy:
       fail-fast: false
       matrix:
         # These archs require an Apple M1 runner: [arm64, universal2]
-        arch: [x86_64]
+        arch: [x86_64, arm64]
         pyver: [cp39, cp310, cp311, cp312, cp313]
-        macver: ["13"]
-        include:
-          - arch: arm64
-            pyver: cp310
-            macver: "14"
-          - arch: arm64
-            pyver: cp311
-            macver: "14"
-          - arch: arm64
-            pyver: cp312
-            macver: "14"
-          - arch: arm64
-            pyver: cp313
-            macver: "14"
 
     steps:
       - name: Checkout repos
@@ -171,6 +157,7 @@ jobs:
         env:
           CIBW_BUILD: ${{matrix.pyver}}-macosx_${{matrix.arch}}
           CIBW_ARCHS_MACOS: ${{matrix.arch}}
+          MACOSX_ARCHITECTURE: ${{matrix.arch}}
           CIBW_BEFORE_ALL_MACOS: ./scripts/build/wheel_macos_before_all.sh
           CIBW_TEST_COMMAND: >-
             export PYTHONPATH={project} &&
@@ -184,7 +171,7 @@ jobs:
       - name: Upload artifacts
         uses: actions/upload-artifact@v4
         with:
-          name: macos-${{matrix.pyver}}-macos-${{matrix.macver}}_${{matrix.arch}}
+          name: macos-${{matrix.pyver}}-macos-${{matrix.arch}}
           path: ./wheelhouse/*.whl
 
   # }}}

scripts/build/build_libpq.sh

@@ -68,9 +68,12 @@ case "$ID" in
         # it, force use of system curl.
         brew uninstall --force --ignore-dependencies openssl gettext
         curl="/usr/bin/curl"
-        # The deployment target should be <= to that of the oldest supported Python version.
+        if [ -z "$MACOSX_ARCHITECTURE" ]; then
+            MACOSX_ARCHITECTURE="$(uname -m)"
+        fi
+        # Set the deployment target to be <= to that of the oldest supported Python version.
         # e.g. https://www.python.org/downloads/release/python-380/
-        if [ "$(uname -m)" == "x86_64" ]; then
+        if [ "$MACOSX_ARCHITECTURE" == "x86_64" ]; then
             export MACOSX_DEPLOYMENT_TARGET=10.9
         else
             export MACOSX_DEPLOYMENT_TARGET=11.0
@@ -83,6 +86,22 @@ case "$ID" in
         ;;
 esac
 
+
+if [ "$ID" == "macos" ]; then
+    make_configure_standard_flags=( \
+        --prefix=${LIBPQ_BUILD_PREFIX} \
+        "CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ -arch $MACOSX_ARCHITECTURE" \
+        "LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib -arch $MACOSX_ARCHITECTURE" \
+    )
+else
+    make_configure_standard_flags=( \
+        --prefix=${LIBPQ_BUILD_PREFIX} \
+        CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ \
+        LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib \
+    )
+fi
+
+
 if [ "$ID" == "centos" ] || [ "$ID" == "macos" ]; then
 
     # Build openssl if needed
@@ -94,8 +113,14 @@ if [ "$ID" == "centos" ] || [ "$ID" == "macos" ]; then
 
         cd "${openssl_dir}"
 
-        ./config --prefix=${LIBPQ_BUILD_PREFIX} --openssldir=${LIBPQ_BUILD_PREFIX} \
-            zlib -fPIC shared
+        options=(--prefix=${LIBPQ_BUILD_PREFIX} --openssldir=${LIBPQ_BUILD_PREFIX} \
+            zlib -fPIC shared)
+        if [ -z "$MACOSX_ARCHITECTURE" ]; then
+            ./config $options
+        else
+            ./configure "darwin64-$MACOSX_ARCHITECTURE-cc" $options
+        fi
+
         make depend
         make
     else
@@ -119,9 +144,7 @@ if [ "$ID" == "macos" ]; then
             | tar xzf -
 
         cd "${krb5_dir}"
-
-        ./configure --prefix=${LIBPQ_BUILD_PREFIX} \
-            CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib
+        ./configure "${make_configure_standard_flags[@]}"
         make
     else
         cd "${krb5_dir}"
@@ -143,9 +166,7 @@ if [ "$ID" == "macos" ]; then
             | tar xzf -
 
         cd "${gettext_dir}"
-
-        ./configure --prefix=${LIBPQ_BUILD_PREFIX} --disable-java \
-            CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib
+        ./configure --disable-java "${make_configure_standard_flags[@]}"
         make -C gettext-runtime all
     else
         cd "${gettext_dir}"
@@ -173,8 +194,7 @@ if [ "$ID" == "centos" ] || [ "$ID" == "macos" ]; then
         cd "${sasl_dir}"
 
         autoreconf -i
-        ./configure --prefix=${LIBPQ_BUILD_PREFIX} --disable-macos-framework \
-            CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib
+        ./configure "${make_configure_standard_flags[@]}" --disable-macos-framework
         make
     else
         cd "${sasl_dir}"
@@ -201,8 +221,7 @@ if [ "$ID" == "centos" ] || [ "$ID" == "macos" ]; then
 
         cd "${ldap_dir}"
 
-        ./configure --prefix=${LIBPQ_BUILD_PREFIX} --enable-backends=no --enable-null \
-            CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib
+        ./configure "${make_configure_standard_flags[@]}" --enable-backends=no --enable-null
 
         make depend
         make -C libraries/liblutil/
@@ -243,10 +262,9 @@ if [ ! -d "${postgres_dir}" ]; then
     # Often needed, but currently set by the workflow
     # export LD_LIBRARY_PATH="${LIBPQ_BUILD_PREFIX}/lib"
 
-    ./configure --prefix=${LIBPQ_BUILD_PREFIX} --sysconfdir=/etc/postgresql-common \
+    ./configure "${make_configure_standard_flags[@]}" --sysconfdir=/etc/postgresql-common \
         --with-gssapi --with-openssl --with-pam --with-ldap \
-        --without-readline --without-icu \
-        CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib
+        --without-readline --without-icu
     make -C src/interfaces/libpq
     make -C src/bin/pg_config
     make -C src/include