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m4_ax_check_zlib.m4
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m4_ax_check_zlib.m4
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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_zlib.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_ZLIB([action-if-found], [action-if-not-found])
#
# DESCRIPTION
#
# This macro searches for an installed zlib library. If nothing was
# specified when calling configure, it searches first in /usr/local and
# then in /usr, /opt/local and /sw. If the --with-zlib=DIR is specified,
# it will try to find it in DIR/include/zlib.h and DIR/lib/libz.a. If
# --without-zlib is specified, the library is not searched at all.
#
# If either the header file (zlib.h) or the library (libz) is not found,
# shell commands 'action-if-not-found' is run. If 'action-if-not-found' is
# not specified, the configuration exits on error, asking for a valid zlib
# installation directory or --without-zlib.
#
# If both header file and library are found, shell commands
# 'action-if-found' is run. If 'action-if-found' is not specified, the
# default action appends '-I${ZLIB_HOME}/include' to CPFLAGS, appends
# '-L${ZLIB_HOME}/lib' to LDFLAGS (BUT ONLY IF ZLIB_HOME IS NOT EXACTLY
# "/usr"), prepends '-lz' to LIBS, and calls AC_DEFINE(HAVE_LIBZ).
# You should use autoheader to include a definition for this symbol in a
# config.h file. Sample usage in a C/C++ source is as follows:
#
# #ifdef HAVE_LIBZ
# #include <zlib.h>
# #endif /* HAVE_LIBZ */
#
# LICENSE
#
# Copyright (c) 2008 Loic Dachary <[email protected]>
# Copyright (c) 2010 Bastien Chevreux <[email protected]>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 16.0.0.1
AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB])
AC_DEFUN([AX_CHECK_ZLIB],
#
# Handle user hints
#
[AC_MSG_CHECKING(if zlib is wanted)
zlib_places="/usr/local /usr /opt/local /sw"
AC_ARG_WITH([zlib],
[ --with-zlib=DIR root directory path of zlib installation @<:@defaults to
/usr/local or /usr if not found in /usr/local@:>@
--without-zlib to disable zlib usage completely],
[if test "$withval" != no ; then
AC_MSG_RESULT(yes)
if test -d "$withval"
then
zlib_places="$withval $zlib_places"
else
AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
fi
else
zlib_places=
AC_MSG_RESULT(no)
fi],
[AC_MSG_RESULT(yes)])
#
# Locate zlib, if wanted
#
if test -n "${zlib_places}"
then
# check the user supplied or any other more or less 'standard' place:
# Most UNIX systems : /usr/local and /usr
# MacPorts / Fink on OSX : /opt/local respectively /sw
for ZLIB_HOME in ${zlib_places} ; do
if test -f "${ZLIB_HOME}/include/zlib.h"; then break; fi
ZLIB_HOME=""
done
ZLIB_OLD_LDFLAGS=$LDFLAGS
ZLIB_OLD_CPPFLAGS=$CPPFLAGS
if test -n "${ZLIB_HOME}"; then
if test "${ZLIB_HOME}" != "/usr"; then
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
fi
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
fi
AC_LANG_PUSH([C])
AC_CHECK_LIB([z], [inflateEnd], [zlib_cv_libz=yes], [zlib_cv_libz=no])
AC_CHECK_HEADER([zlib.h], [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
AC_LANG_POP([C])
if test "$zlib_cv_libz" = "yes" && test "$zlib_cv_zlib_h" = "yes"
then
#
# If both library and header were found, action-if-found
#
m4_ifblank([$1],[
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
if test "${ZLIB_HOME}" != "/usr"; then
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
fi
LIBS="-lz $LIBS"
AC_DEFINE([HAVE_LIBZ], [1],
[Define to 1 if you have `z' library (-lz)])
],[
# Restore variables
LDFLAGS="$ZLIB_OLD_LDFLAGS"
CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
$1
])
else
#
# If either header or library was not found, action-if-not-found
#
m4_default([$2],[
AC_MSG_ERROR([either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib])
])
fi
fi
])