1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_check_zlib.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_CHECK_ZLIB() 8# 9# DESCRIPTION 10# 11# This macro searches for an installed zlib library. If nothing was 12# specified when calling configure, it searches first in /usr/local and 13# then in /usr. If the --with-zlib=DIR is specified, it will try to find 14# it in DIR/include/zlib.h and DIR/lib/libz.a. If --without-zlib is 15# specified, the library is not searched at all. 16# 17# If either the header file (zlib.h) or the library (libz) is not found, 18# the configuration exits on error, asking for a valid zlib installation 19# directory or --without-zlib. 20# 21# The macro defines the symbol HAVE_LIBZ if the library is found. You 22# should use autoheader to include a definition for this symbol in a 23# config.h file. Sample usage in a C/C++ source is as follows: 24# 25# #ifdef HAVE_LIBZ 26# #include <zlib.h> 27# #endif /* HAVE_LIBZ */ 28# 29# LICENSE 30# 31# Copyright (c) 2008 Loic Dachary <loic@senga.org> 32# 33# This program is free software; you can redistribute it and/or modify it 34# under the terms of the GNU General Public License as published by the 35# Free Software Foundation; either version 2 of the License, or (at your 36# option) any later version. 37# 38# This program is distributed in the hope that it will be useful, but 39# WITHOUT ANY WARRANTY; without even the implied warranty of 40# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 41# Public License for more details. 42# 43# You should have received a copy of the GNU General Public License along 44# with this program. If not, see <http://www.gnu.org/licenses/>. 45# 46# As a special exception, the respective Autoconf Macro's copyright owner 47# gives unlimited permission to copy, distribute and modify the configure 48# scripts that are the output of Autoconf when processing the Macro. You 49# need not follow the terms of the GNU General Public License when using 50# or distributing such scripts, even though portions of the text of the 51# Macro appear in them. The GNU General Public License (GPL) does govern 52# all other use of the material that constitutes the Autoconf Macro. 53# 54# This special exception to the GPL applies to versions of the Autoconf 55# Macro released by the Autoconf Archive. When you make and distribute a 56# modified version of the Autoconf Macro, you may extend this special 57# exception to the GPL to apply to your modified version as well. 58 59#serial 7 60 61AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB]) 62AC_DEFUN([AX_CHECK_ZLIB], 63# 64# Handle user hints 65# 66[AC_MSG_CHECKING(if zlib is wanted) 67AC_ARG_WITH(zlib, 68[ --with-zlib=DIR root directory path of zlib installation [defaults to 69 /usr/local or /usr if not found in /usr/local] 70 --without-zlib to disable zlib usage completely], 71[if test "$withval" != no ; then 72 AC_MSG_RESULT(yes) 73 if test -d "$withval" 74 then 75 ZLIB_HOME="$withval" 76 else 77 AC_MSG_WARN([Sorry, $withval does not exist, checking usual places]) 78 fi 79else 80 AC_MSG_RESULT(no) 81fi], 82[AC_MSG_RESULT(yes)]) 83 84ZLIB_HOME=/usr/local 85if test ! -f "${ZLIB_HOME}/include/zlib.h" 86then 87 ZLIB_HOME=/usr 88fi 89 90# 91# Locate zlib, if wanted 92# 93if test -n "${ZLIB_HOME}" 94then 95 ZLIB_OLD_LDFLAGS=$LDFLAGS 96 ZLIB_OLD_CPPFLAGS=$LDFLAGS 97 LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib" 98 CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include" 99 AC_LANG_SAVE 100 AC_LANG_C 101 AC_CHECK_LIB(z, inflateEnd, [zlib_cv_libz=yes], [zlib_cv_libz=no]) 102 AC_CHECK_HEADER(zlib.h, [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no]) 103 AC_LANG_RESTORE 104 if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes" 105 then 106 # 107 # If both library and header were found, use them 108 # 109 AC_CHECK_LIB(z, inflateEnd) 110 AC_MSG_CHECKING(zlib in ${ZLIB_HOME}) 111 AC_MSG_RESULT(ok) 112 ZLIB="-lz" 113 AC_SUBST(ZLIB) 114 else 115 # 116 # If either header or library was not found, revert and bomb 117 # 118 AC_MSG_CHECKING(zlib in ${ZLIB_HOME}) 119 LDFLAGS="$ZLIB_OLD_LDFLAGS" 120 CPPFLAGS="$ZLIB_OLD_CPPFLAGS" 121 AC_MSG_RESULT(failed) 122 AC_MSG_ERROR(either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib) 123 fi 124fi 125 126]) 127