build: add script to build the libpq

Added as it currently is in the psycopg2 project.

diff --git a/tools/build/build_libpq.sh b/tools/build/build_libpq.sh
new file mode 100755 (executable)
index 0000000..3d297ad
--- /dev/null
+++ b/tools/build/build_libpq.sh
@@ -0,0 +1,130 @@
+#!/bin/bash
+
+# Build a modern version of libpq and depending libs from source on Centos 5
+
+set -euo pipefail
+set -x
+
+openssl_version="1.1.1l"
+ldap_version="2.4.59"
+sasl_version="2.1.27"
+postgres_version="14.1"
+
+yum install -y zlib-devel krb5-devel pam-devel
+
+
+# Build openssl if needed
+openssl_tag="OpenSSL_${openssl_version//./_}"
+openssl_dir="openssl-${openssl_tag}"
+if [ ! -d "${openssl_dir}" ]; then curl -sL \
+        https://github.com/openssl/openssl/archive/${openssl_tag}.tar.gz \
+        | tar xzf -
+
+    cd "${openssl_dir}"
+
+    ./config --prefix=/usr/local/ --openssldir=/usr/local/ \
+        zlib -fPIC shared
+    make depend
+    make
+else
+    cd "${openssl_dir}"
+fi
+
+# Install openssl
+make install_sw
+cd ..
+
+
+# Build libsasl2 if needed
+# The system package (cyrus-sasl-devel) causes an amazing error on i686:
+# "unsupported version 0 of Verneed record"
+# https://github.com/pypa/manylinux/issues/376
+sasl_tag="cyrus-sasl-${sasl_version}"
+sasl_dir="cyrus-sasl-${sasl_tag}"
+if [ ! -d "${sasl_dir}" ]; then
+    curl -sL \
+        https://github.com/cyrusimap/cyrus-sasl/archive/${sasl_tag}.tar.gz \
+        | tar xzf -
+
+    cd "${sasl_dir}"
+
+    autoreconf -i
+    ./configure
+    make
+else
+    cd "${sasl_dir}"
+fi
+
+# Install libsasl2
+# requires missing nroff to build
+touch saslauthd/saslauthd.8
+make install
+cd ..
+
+
+# Build openldap if needed
+ldap_tag="${ldap_version}"
+ldap_dir="openldap-${ldap_tag}"
+if [ ! -d "${ldap_dir}" ]; then
+    curl -sL \
+        https://www.openldap.org/software/download/OpenLDAP/openldap-release/openldap-${ldap_tag}.tgz \
+        | tar xzf -
+
+    cd "${ldap_dir}"
+
+    ./configure --enable-backends=no --enable-null
+    make depend
+    make -C libraries/liblutil/
+    make -C libraries/liblber/
+    make -C libraries/libldap/
+    make -C libraries/libldap_r/
+else
+    cd "${ldap_dir}"
+fi
+
+# Install openldap
+make -C libraries/liblber/ install
+make -C libraries/libldap/ install
+make -C libraries/libldap_r/ install
+make -C include/ install
+chmod +x /usr/local/lib/{libldap,liblber}*.so*
+cd ..
+
+
+# Build libpq if needed
+postgres_tag="REL_${postgres_version//./_}"
+postgres_dir="postgres-${postgres_tag}"
+if [ ! -d "${postgres_dir}" ]; then
+    curl -sL \
+        https://github.com/postgres/postgres/archive/${postgres_tag}.tar.gz \
+        | tar xzf -
+
+    cd "${postgres_dir}"
+
+    # Match the default unix socket dir default with what defined on Ubuntu and
+    # Red Hat, which seems the most common location
+    sed -i 's|#define DEFAULT_PGSOCKET_DIR .*'\
+'|#define DEFAULT_PGSOCKET_DIR "/var/run/postgresql"|' \
+        src/include/pg_config_manual.h
+
+    # Without this, libpq ./configure fails on i686
+    if [[ "$(uname -m)" == "i686" ]]; then
+        export LD_LIBRARY_PATH=/usr/local/lib
+    fi
+
+    ./configure --prefix=/usr/local --without-readline \
+        --with-gssapi --with-openssl --with-pam --with-ldap
+    make -C src/interfaces/libpq
+    make -C src/bin/pg_config
+    make -C src/include
+else
+    cd "${postgres_dir}"
+fi
+
+# Install libpq
+make -C src/interfaces/libpq install
+make -C src/bin/pg_config install
+make -C src/include install
+cd ..
+
+find /usr/local/ -name \*.so.\* -type f -exec strip --strip-unneeded {} \;