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eliot/m4/ax_lib_expat.m4

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# ===========================================================================
# http://www.nongnu.org/autoconf-archive/ax_lib_expat.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_LIB_EXPAT([MINIMUM-VERSION])
#
# DESCRIPTION
#
# This macro provides tests of availability of Expat XML Parser of
# particular version or newer. This macro checks for Expat XML Parser
# headers and libraries and defines compilation flags
#
# Macro supports following options and their values:
#
# 1) Single-option usage:
#
# --with-expat -- yes, no, or path to Expat XML Parser
# installation prefix
#
# 2) Three-options usage (all options are required):
#
# --with-expat=yes
# --with-expat-inc -- path to base directory with Expat headers
# --with-expat-lib -- linker flags for Expat
#
# This macro calls:
#
# AC_SUBST(EXPAT_CFLAGS)
# AC_SUBST(EXPAT_LDFLAGS)
# AC_SUBST(EXPAT_VERSION) -- only if version requirement is used
#
# And sets:
#
# HAVE_EXPAT
#
# LICENSE
#
# Copyright (c) 2008 Mateusz Loskot <mateusz@loskot.net>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved.
AC_DEFUN([AX_LIB_EXPAT],
[
AC_ARG_WITH([expat],
AC_HELP_STRING([--with-expat=@<:@ARG@:>@],
[use Expat XML Parser from given prefix (ARG=path); check standard prefixes (ARG=yes); disable (ARG=no)]
),
[
if test "$withval" = "yes"; then
if test -f /usr/local/include/expat.h ; then
expat_prefix=/usr/local
elif test -f /usr/include/expat.h ; then
expat_prefix=/usr
else
expat_prefix=""
fi
expat_requested="yes"
elif test -d "$withval"; then
expat_prefix="$withval"
expat_requested="yes"
else
expat_prefix=""
expat_requested="no"
fi
],
[
dnl Default behavior is implicit yes
if test -f /usr/local/include/expat.h ; then
expat_prefix=/usr/local
elif test -f /usr/include/expat.h ; then
expat_prefix=/usr
else
expat_prefix=""
fi
]
)
AC_ARG_WITH([expat-inc],
AC_HELP_STRING([--with-expat-inc=@<:@DIR@:>@],
[path to Expat XML Parser headers]
),
[expat_include_dir="$withval"],
[expat_include_dir=""]
)
AC_ARG_WITH([expat-lib],
AC_HELP_STRING([--with-expat-lib=@<:@ARG@:>@],
[link options for Expat XML Parser libraries]
),
[expat_lib_flags="$withval"],
[expat_lib_flags=""]
)
EXPAT_CFLAGS=""
EXPAT_LDFLAGS=""
EXPAT_VERSION=""
dnl
dnl Collect include/lib paths and flags
dnl
run_expat_test="no"
if test -n "$expat_prefix"; then
expat_include_dir="$expat_prefix/include"
expat_lib_flags="-L$expat_prefix/lib -lexpat"
run_expat_test="yes"
elif test "$expat_requested" = "yes"; then
if test -n "$expat_include_dir" -a -n "$expat_lib_flags"; then
run_expat_test="yes"
fi
else
run_expat_test="no"
fi
dnl
dnl Check Expat XML Parser files
dnl
if test "$run_expat_test" = "yes"; then
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$expat_include_dir"
saved_LIBS="$LIBS"
LIBS="$LIBS $expat_lib_flags"
dnl
dnl Check Expat headers
dnl
AC_MSG_CHECKING([for Expat XML Parser headers in $expat_include_dir])
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[[
@%:@include <expat.h>
]],
[[]]
)],
[
EXPAT_CFLAGS="-I$expat_include_dir"
expat_header_found="yes"
AC_MSG_RESULT([found])
],
[
expat_header_found="no"
AC_MSG_RESULT([not found])
]
)
AC_LANG_POP([C++])
dnl
dnl Check Expat libraries
dnl
if test "$expat_header_found" = "yes"; then
AC_MSG_CHECKING([for Expat XML Parser libraries])
AC_LANG_PUSH([C++])
AC_LINK_IFELSE([
AC_LANG_PROGRAM(
[[
@%:@include <expat.h>
]],
[[
XML_Parser p = XML_ParserCreate(NULL);
XML_ParserFree(p);
p = NULL;
]]
)],
[
EXPAT_LDFLAGS="$expat_lib_flags"
expat_lib_found="yes"
AC_MSG_RESULT([found])
],
[
expat_lib_found="no"
AC_MSG_RESULT([not found])
]
)
AC_LANG_POP([C++])
fi
CPPFLAGS="$saved_CPPFLAGS"
LIBS="$saved_LIBS"
fi
AC_MSG_CHECKING([for Expat XML Parser])
if test "$run_expat_test" = "yes"; then
if test "$expat_header_found" = "yes" -a "$expat_lib_found" = "yes"; then
AC_SUBST([EXPAT_CFLAGS])
AC_SUBST([EXPAT_LDFLAGS])
HAVE_EXPAT="yes"
else
HAVE_EXPAT="no"
fi
AC_MSG_RESULT([$HAVE_EXPAT])
dnl
dnl Check Expat version
dnl
if test "$HAVE_EXPAT" = "yes"; then
expat_version_req=ifelse([$1], [], [], [$1])
if test -n "$expat_version_req"; then
AC_MSG_CHECKING([if Expat XML Parser version is >= $expat_version_req])
if test -f "$expat_include_dir/expat.h"; then
expat_major=`cat $expat_include_dir/expat.h | \
grep '^#define.*XML_MAJOR_VERSION.*[0-9]$' | \
sed -e 's/#define XML_MAJOR_VERSION.//'`
expat_minor=`cat $expat_include_dir/expat.h | \
grep '^#define.*XML_MINOR_VERSION.*[0-9]$' | \
sed -e 's/#define XML_MINOR_VERSION.//'`
expat_revision=`cat $expat_include_dir/expat.h | \
grep '^#define.*XML_MICRO_VERSION.*[0-9]$' | \
sed -e 's/#define XML_MICRO_VERSION.//'`
EXPAT_VERSION="$expat_major.$expat_minor.$expat_revision"
AC_SUBST([EXPAT_VERSION])
dnl Decompose required version string and calculate numerical representation
expat_version_req_major=`expr $expat_version_req : '\([[0-9]]*\)'`
expat_version_req_minor=`expr $expat_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
expat_version_req_revision=`expr $expat_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
if test "x$expat_version_req_revision" = "x"; then
expat_version_req_revision="0"
fi
expat_version_req_number=`expr $expat_version_req_major \* 10000 \
\+ $expat_version_req_minor \* 100 \
\+ $expat_version_req_revision`
dnl Calculate numerical representation of detected version
expat_version_number=`expr $expat_major \* 10000 \
\+ $expat_minor \* 100 \
\+ $expat_revision`
expat_version_check=`expr $expat_version_number \>\= $expat_version_req_number`
if test "$expat_version_check" = "1"; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_MSG_WARN([Found Expat XML Parser $EXPAT_VERSION, which is older than required. Possible compilation failure.])
fi
else
AC_MSG_RESULT([no])
AC_MSG_WARN([Missing expat.h header. Unable to determine Expat version.])
fi
fi
fi
else
HAVE_EXPAT="no"
AC_MSG_RESULT([$HAVE_EXPAT])
if test "$expat_requested" = "yes"; then
AC_MSG_WARN([Expat XML Parser support requested but headers or library not found. Specify valid prefix of Expat using --with-expat=@<:@DIR@:>@ or provide include directory and linker flags using --with-expat-inc and --with-expat-lib])
fi
fi
])
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