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Use pkg-config to find libxml2, falling back to xml2-config if necessary #2714

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Oct 14, 2022
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Use pkg-config to find libxml2, falling back to xml2-config if necessary #2714

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58 changes: 41 additions & 17 deletions build/libxml.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -4,20 +4,7 @@ dnl Sets:
dnl LIBXML2_CFLAGS
dnl LIBXML2_LIBS

LIBXML2_CONFIG=""
LIBXML2_VERSION=""
LIBXML2_CFLAGS=""
LIBXML2_CPPFLAGS=""
LIBXML2_LDADD=""
LIBXML2_LDFLAGS=""

AC_DEFUN([CHECK_LIBXML2], [

AC_ARG_WITH(
libxml,
[AC_HELP_STRING([--with-libxml=PATH],[Path to libxml2 prefix or config script])],
[test_paths="${with_libxml}"],
[test_paths="/usr/local/libxml2 /usr/local/xml2 /usr/local/xml /usr/local /opt/libxml2 /opt/libxml /opt/xml2 /opt/xml /opt /usr"])
AC_DEFUN([CHECK_XML2CONFIG], [

AC_MSG_CHECKING([for libxml2 config script])

Expand Down Expand Up @@ -58,19 +45,56 @@ if test -n "${libxml2_path}"; then
LIBXML2_LDADD="`${LIBXML2_CONFIG} --libs`"
if test ! -z "${LIBXML2_LDADD}"; then AC_MSG_NOTICE(xml LDADD: $LIBXML2_LDADD); fi

AC_MSG_CHECKING([if libxml2 is at least v2.6.29])
libxml2_min_ver=`echo 2.6.29 | awk -F. '{print (\$ 1 * 1000000) + (\$ 2 * 1000) + \$ 3}'`
AC_MSG_CHECKING([if libxml2 is at least v${LIBXML2_MIN_VERSION}])
libxml2_min_ver=`echo ${LIBXML2_MIN_VERSION} | awk -F. '{print (\$ 1 * 1000000) + (\$ 2 * 1000) + \$ 3}'`
libxml2_ver=`echo ${LIBXML2_VERSION} | awk -F. '{print (\$ 1 * 1000000) + (\$ 2 * 1000) + \$ 3}'`
if test "$libxml2_ver" -ge "$libxml2_min_ver"; then
AC_MSG_RESULT([yes, $LIBXML2_VERSION])
else
AC_MSG_RESULT([no, $LIBXML2_VERSION])
AC_MSG_ERROR([NOTE: libxml2 library must be at least 2.6.29])
AC_MSG_ERROR([NOTE: libxml2 library must be at least ${LIBXML2_MIN_VERSION}])
fi

else
AC_MSG_RESULT([no])
fi
])

AC_DEFUN([CHECK_LIBXML2], [

AC_ARG_WITH(
libxml,
[AC_HELP_STRING([--with-libxml=PATH],[Path to libxml2 prefix or config script])],
[test_paths="${with_libxml}"],
[test_paths="/usr/local/libxml2 /usr/local/xml2 /usr/local/xml /usr/local /opt/libxml2 /opt/libxml /opt/xml2 /opt/xml /opt /usr"])

LIBXML2_MIN_VERSION="2.6.29"
LIBXML2_PKG_NAME="libxml-2.0"
LIBXML2_CONFIG=""
LIBXML2_VERSION=""
LIBXML2_CFLAGS=""
LIBXML2_CPPFLAGS=""
LIBXML2_LDADD=""
LIBXML2_LDFLAGS=""

if test "x${with_libxml}" != "xno"; then
if test -n "${PKG_CONFIG}"; then
AC_MSG_CHECKING([for libxml2 >= ${LIBXML2_MIN_VERSION} via pkg-config])
if `${PKG_CONFIG} --exists "${LIBXML2_PKG_NAME} >= ${LIBXML2_MIN_VERSION}"`; then
LIBXML2_VERSION="`${PKG_CONFIG} --modversion ${LIBXML2_PKG_NAME}`"
LIBXML2_CFLAGS="`${PKG_CONFIG} --cflags ${LIBXML2_PKG_NAME}` -DWITH_LIBXML2"
LIBXML2_LDADD="`${PKG_CONFIG} --libs-only-l ${LIBXML2_PKG_NAME}`"
LIBXML2_LDFLAGS="`${PKG_CONFIG} --libs-only-L --libs-only-other ${LIBXML2_PKG_NAME}`"
AC_MSG_RESULT([found version ${LIBXML2_VERSION}])
else
AC_MSG_RESULT([not found])
fi
fi

if test -z "${LIBXML2_VERSION}"; then
CHECK_XML2CONFIG
fi
fi

AC_SUBST(LIBXML2_CONFIG)
AC_SUBST(LIBXML2_VERSION)
Expand Down