ci(macos): Avoid linking against homebrew

Homebrew binaries are always compiled for exactly the version they're
installed on making them very un-portable. When a wheel is "repaired" by
cibuildwheel, delocate-wheel pulls in _psycopg's dependencies
(libpq.dylib, libssl.dylib and libcrypto.dylib) which, on a GitHub
Actions macOS 14 runner, are provided by Homebrew and are therefore only
macOS >= 14 compatible. The resultant wheel is therefore incompatible
with all but the latest macOS versions.

Build all dependencies from source so that we can set the deployment
target to something sensible. Fixes psycopg#1753.

.github/workflows/packages.yml

@@ -5,10 +5,12 @@ on:
 
 env:
   PIP_BREAK_SYSTEM_PACKAGES: "1"
+  LIBPQ_VERSION: "16.0"
+  OPENSSL_VERSION: "1.1.1w"
 
 jobs:
   build-sdist:
-    if: true
+    if: false
     strategy:
       fail-fast: false
       matrix:
@@ -58,16 +60,12 @@ jobs:
   build-linux:
     if: true
 
-    env:
-      LIBPQ_VERSION: "16.0"
-      OPENSSL_VERSION: "1.1.1w"
-
     strategy:
       fail-fast: false
       matrix:
         platform: [manylinux, musllinux]
-        arch: [x86_64, i686, aarch64, ppc64le]
-        pyver: [cp38, cp39, cp310, cp311, cp312, cp313]
+        arch: [x86_64] #, i686, aarch64, ppc64le]
+        pyver: [cp38] #, cp39, cp310, cp311, cp312, cp313]
 
     runs-on: ubuntu-latest
     steps:
@@ -140,18 +138,12 @@ jobs:
       matrix:
         # These archs require an Apple M1 runner: [arm64, universal2]
         arch: [x86_64]
-        pyver: [cp38, cp39, cp310, cp311, cp312, cp313]
+        pyver: [cp38, cp313]
         macver: ["12"]
         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"
@@ -160,6 +152,12 @@ jobs:
       - name: Checkout repos
         uses: actions/checkout@v4
 
+      - name: Build dependencies
+        run: ./scripts/build/build_libpq.sh
+
+      - name: Show dependency tree
+        run: otool -L /tmp/libpq.build/lib/*.dylib
+
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.21.2
         env:
@@ -170,12 +168,11 @@ jobs:
             export PYTHONPATH={project} &&
             python -c "import tests; tests.unittest.main(defaultTest='tests.test_suite')"
           CIBW_ENVIRONMENT: >-
-            MACOSX_DEPLOYMENT_TARGET=${{ matrix.macver }}.0
             PG_VERSION=16
             PACKAGE_NAME=psycopg2-binary
             PSYCOPG2_TESTDB=postgres
             PSYCOPG2_TEST_FAST=1
-            PATH="/usr/local/opt/postgresql@${PG_VERSION}/bin:$PATH"
+            PATH="/tmp/libpq.build/bin:$PATH"
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4

.github/workflows/tests.yml

@@ -9,6 +9,7 @@ on:
 
 jobs:
   tests:
+    if: false
     name: Unit tests run
     runs-on: ubuntu-latest
 

scripts/build/build_libpq.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Build a modern version of libpq and depending libs from source on Centos 5
+# Build a modern version of libpq and depending libs from source on Centos 5, Alpine or macOS
 
 set -euo pipefail
 set -x
@@ -12,30 +12,66 @@ postgres_version="${LIBPQ_VERSION}"
 # last release: https://www.openssl.org/source/
 openssl_version="${OPENSSL_VERSION}"
 
+# last release: https://kerberos.org/dist/
+krb5_version="1.21.3"
+
 # last release: https://openldap.org/software/download/
-ldap_version="2.6.3"
+ldap_version="2.6.8"
 
 # last release: https://github.com/cyrusimap/cyrus-sasl/releases
 sasl_version="2.1.28"
 
 export LIBPQ_BUILD_PREFIX=${LIBPQ_BUILD_PREFIX:-/tmp/libpq.build}
 
-if [[ -f "${LIBPQ_BUILD_PREFIX}/lib/libpq.so" ]]; then
+case "$(uname)" in
+    Darwin)
+        ID=macos
+        library_suffix=dylib
+        ;;
+
+    Linux)
+        source /etc/os-release
+        library_suffix=so
+        ;;
+
+    *)
+        echo "$0: unexpected Operating system: '$(uname)'" >&2
+        exit 1
+        ;;
+esac
+
+if [[ -f "${LIBPQ_BUILD_PREFIX}/lib/libpq.${library_suffix}" ]]; then
     echo "libpq already available: build skipped" >&2
     exit 0
 fi
 
-source /etc/os-release
-
 case "$ID" in
     centos)
         yum update -y
         yum install -y zlib-devel krb5-devel pam-devel
+        curl="$(which curl)"
         ;;
 
     alpine)
         apk upgrade
         apk add --no-cache zlib-dev krb5-dev linux-pam-dev openldap-dev openssl-dev
+        curl="$(which curl)"
+        ;;
+
+    macos)
+        brew install automake
+        # If available, libpq seemingly insists on linking against homebrew's
+        # openssl no matter what so remove it. Since homebrew's curl depends on
+        # it, force use of system curl.
+        brew uninstall --force --ignore-dependencies openssl
+        curl="/usr/bin/curl"
+        # The deployment target should be <= to that of the oldest supported Python version.
+        # e.g. https://www.python.org/downloads/release/python-380/
+        if [ "$(uname -m)" == "x86_64" ]; then
+            export MACOSX_DEPLOYMENT_TARGET=10.9
+        else
+            export MACOSX_DEPLOYMENT_TARGET=11.0
+        fi
         ;;
 
     *)
@@ -44,12 +80,12 @@ case "$ID" in
         ;;
 esac
 
-if [ "$ID" == "centos" ]; then
+if [ "$ID" == "centos" ] || [ "$ID" == "macos" ]; then
 
     # Build openssl if needed
     openssl_tag="OpenSSL_${openssl_version//./_}"
     openssl_dir="openssl-${openssl_tag}"
-    if [ ! -d "${openssl_dir}" ]; then curl -sL \
+    if [ ! -d "${openssl_dir}" ]; then "$curl" -sL \
             https://github.com/openssl/openssl/archive/${openssl_tag}.tar.gz \
             | tar xzf -
 
@@ -70,7 +106,31 @@ if [ "$ID" == "centos" ]; then
 fi
 
 
-if [ "$ID" == "centos" ]; then
+if [ "$ID" == "macos" ]; then
+
+    # Build kerberos if needed
+    krb5_dir="krb5-${krb5_version}/src"
+    if [ ! -d "${krb5_dir}" ]; then
+        "$curl" -sL \
+            curl -sL "https://kerberos.org/dist/krb5/$(echo 1.21.3 | grep -oE '\d+\.\d+')/krb5-${krb5_version}.tar.gz" \
+            | tar xzf -
+
+        cd "${krb5_dir}"
+
+        ./configure --prefix=${LIBPQ_BUILD_PREFIX} \
+            CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib
+        make
+    else
+        cd "${krb5_dir}"
+    fi
+
+    make install
+    cd ../..
+
+fi
+
+
+if [ "$ID" == "centos" ] || [ "$ID" == "macos" ]; then
 
     # Build libsasl2 if needed
     # The system package (cyrus-sasl-devel) causes an amazing error on i686:
@@ -79,14 +139,14 @@ if [ "$ID" == "centos" ]; then
     sasl_tag="cyrus-sasl-${sasl_version}"
     sasl_dir="cyrus-sasl-${sasl_tag}"
     if [ ! -d "${sasl_dir}" ]; then
-        curl -sL \
+        "$curl" -sL \
             https://github.com/cyrusimap/cyrus-sasl/archive/${sasl_tag}.tar.gz \
             | tar xzf -
 
         cd "${sasl_dir}"
 
         autoreconf -i
-        ./configure --prefix=${LIBPQ_BUILD_PREFIX} \
+        ./configure --prefix=${LIBPQ_BUILD_PREFIX} --disable-macos-framework \
             CPPFLAGS=-I${LIBPQ_BUILD_PREFIX}/include/ LDFLAGS=-L${LIBPQ_BUILD_PREFIX}/lib
         make
     else
@@ -102,13 +162,13 @@ if [ "$ID" == "centos" ]; then
 fi
 
 
-if [ "$ID" == "centos" ]; then
+if [ "$ID" == "centos" ] || [ "$ID" == "macos" ]; then
 
     # Build openldap if needed
     ldap_tag="${ldap_version}"
     ldap_dir="openldap-${ldap_tag}"
     if [ ! -d "${ldap_dir}" ]; then
-        curl -sL \
+        "$curl" -sL \
             https://www.openldap.org/software/download/OpenLDAP/openldap-release/openldap-${ldap_tag}.tgz \
             | tar xzf -
 
@@ -129,7 +189,7 @@ if [ "$ID" == "centos" ]; then
     make -C libraries/liblber/ install
     make -C libraries/libldap/ install
     make -C include/ install
-    chmod +x ${LIBPQ_BUILD_PREFIX}/lib/{libldap,liblber}*.so*
+    chmod +x ${LIBPQ_BUILD_PREFIX}/lib/{libldap,liblber}*.${library_suffix}*
     cd ..
 
 fi
@@ -139,17 +199,19 @@ fi
 postgres_tag="REL_${postgres_version//./_}"
 postgres_dir="postgres-${postgres_tag}"
 if [ ! -d "${postgres_dir}" ]; then
-    curl -sL \
+    "$curl" -sL \
         https://github.com/postgres/postgres/archive/${postgres_tag}.tar.gz \
         | tar xzf -
 
     cd "${postgres_dir}"
 
-    # Match the default unix socket dir default with what defined on Ubuntu and
-    # Red Hat, which seems the most common location
-    sed -i 's|#define DEFAULT_PGSOCKET_DIR .*'\
+    if [ "$ID" != "macos" ]; then
+        # Match the default unix socket dir default with what defined on Ubuntu and
+        # Red Hat, which seems the most common location
+        sed -i 's|#define DEFAULT_PGSOCKET_DIR .*'\
 '|#define DEFAULT_PGSOCKET_DIR "/var/run/postgresql"|' \
-        src/include/pg_config_manual.h
+            src/include/pg_config_manual.h
+    fi
 
     # Often needed, but currently set by the workflow
     # export LD_LIBRARY_PATH="${LIBPQ_BUILD_PREFIX}/lib"
@@ -171,4 +233,4 @@ make -C src/bin/pg_config install
 make -C src/include install
 cd ..
 
-find ${LIBPQ_BUILD_PREFIX} -name \*.so.\* -type f -exec strip --strip-unneeded {} \;
+find ${LIBPQ_BUILD_PREFIX} -name \*.${library_suffix}.\* -type f -exec strip --strip-unneeded {} \;