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/m4/ax_check_zlib.m4

http://github.com/mozy/mordor
m4 | 149 lines | 64 code | 5 blank | 80 comment | 0 complexity | fddf46115319cde6000d0c17a7eb7c23 MD5 | raw file
  1# ===========================================================================
  2#       http://www.gnu.org/software/autoconf-archive/ax_check_zlib.html
  3# ===========================================================================
  4#
  5# SYNOPSIS
  6#
  7#   AX_CHECK_ZLIB([action-if-found], [action-if-not-found])
  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, /opt/local and /sw. If the --with-zlib=DIR is specified,
 14#   it will try to find it in DIR/include/zlib.h and DIR/lib/libz.a. If
 15#   --without-zlib is 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#   shell commands 'action-if-not-found' is run. If 'action-if-not-found' is
 19#   not specified, the configuration exits on error, asking for a valid zlib
 20#   installation directory or --without-zlib.
 21#
 22#   If both header file and library are found, shell commands
 23#   'action-if-found' is run. If 'action-if-found' is not specified, the
 24#   default action appends '-I${ZLIB_HOME}/include' to CPFLAGS, appends
 25#   '-L$ZLIB_HOME}/lib' to LDFLAGS, prepends '-lz' to LIBS, and calls
 26#   AC_DEFINE(HAVE_LIBZ). You should use autoheader to include a definition
 27#   for this symbol in a config.h file. Sample usage in a C/C++ source is as
 28#   follows:
 29#
 30#     #ifdef HAVE_LIBZ
 31#     #include <zlib.h>
 32#     #endif /* HAVE_LIBZ */
 33#
 34# LICENSE
 35#
 36#   Copyright (c) 2008 Loic Dachary <loic@senga.org>
 37#   Copyright (c) 2010 Bastien Chevreux <bach@chevreux.org>
 38#
 39#   This program is free software; you can redistribute it and/or modify it
 40#   under the terms of the GNU General Public License as published by the
 41#   Free Software Foundation; either version 2 of the License, or (at your
 42#   option) any later version.
 43#
 44#   This program is distributed in the hope that it will be useful, but
 45#   WITHOUT ANY WARRANTY; without even the implied warranty of
 46#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 47#   Public License for more details.
 48#
 49#   You should have received a copy of the GNU General Public License along
 50#   with this program. If not, see <http://www.gnu.org/licenses/>.
 51#
 52#   As a special exception, the respective Autoconf Macro's copyright owner
 53#   gives unlimited permission to copy, distribute and modify the configure
 54#   scripts that are the output of Autoconf when processing the Macro. You
 55#   need not follow the terms of the GNU General Public License when using
 56#   or distributing such scripts, even though portions of the text of the
 57#   Macro appear in them. The GNU General Public License (GPL) does govern
 58#   all other use of the material that constitutes the Autoconf Macro.
 59#
 60#   This special exception to the GPL applies to versions of the Autoconf
 61#   Macro released by the Autoconf Archive. When you make and distribute a
 62#   modified version of the Autoconf Macro, you may extend this special
 63#   exception to the GPL to apply to your modified version as well.
 64
 65#serial 14
 66
 67AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB])
 68AC_DEFUN([AX_CHECK_ZLIB],
 69#
 70# Handle user hints
 71#
 72[AC_MSG_CHECKING(if zlib is wanted)
 73zlib_places="/usr/local /usr /opt/local /sw"
 74AC_ARG_WITH([zlib],
 75[  --with-zlib=DIR         root directory path of zlib installation @<:@defaults to
 76                          /usr/local or /usr if not found in /usr/local@:>@
 77  --without-zlib          to disable zlib usage completely],
 78[if test "$withval" != no ; then
 79  AC_MSG_RESULT(yes)
 80  if test -d "$withval"
 81  then
 82    zlib_places="$withval $zlib_places"
 83  else
 84    AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
 85  fi
 86else
 87  zlib_places=
 88  AC_MSG_RESULT(no)
 89fi],
 90[AC_MSG_RESULT(yes)])
 91
 92#
 93# Locate zlib, if wanted
 94#
 95if test -n "${zlib_places}"
 96then
 97	# check the user supplied or any other more or less 'standard' place:
 98	#   Most UNIX systems      : /usr/local and /usr
 99	#   MacPorts / Fink on OSX : /opt/local respectively /sw
100	for ZLIB_HOME in ${zlib_places} ; do
101	  if test -f "${ZLIB_HOME}/include/zlib.h"; then break; fi
102	  ZLIB_HOME=""
103	done
104
105  ZLIB_OLD_LDFLAGS=$LDFLAGS
106  ZLIB_OLD_CPPFLAGS=$CPPFLAGS
107  if test -n "${ZLIB_HOME}"; then
108        LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
109        CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
110  fi
111  AC_LANG_SAVE
112  AC_LANG_C
113  AC_CHECK_LIB([z], [inflateEnd], [zlib_cv_libz=yes], [zlib_cv_libz=no])
114  AC_CHECK_HEADER([zlib.h], [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
115  AC_LANG_RESTORE
116  if test "$zlib_cv_libz" = "yes" && test "$zlib_cv_zlib_h" = "yes"
117  then
118    #
119    # If both library and header were found, action-if-found
120    #
121    m4_ifblank([$1],[
122                CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
123                LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
124                LIBS="-lz $LIBS"
125                AC_DEFINE([HAVE_LIBZ], [1],
126                          [Define to 1 if you have `z' library (-lz)])
127               ],[
128                # Restore variables
129                LDFLAGS="$ZLIB_OLD_LDFLAGS"
130                CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
131                $1
132               ])
133  else
134    #
135    # If either header or library was not found, action-if-not-found
136    #
137    m4_default([$2],[
138                AC_MSG_ERROR([either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib])
139                ])
140  fi
141fi
142])
143
144dnl If needed, define the m4_ifblank macros from autoconf 2.64
145dnl This allows us to run with earlier Autoconfs as well.
146ifdef([m4_ifblank],[],[
147m4_define([m4_ifblank],
148[m4_if(m4_translit([[$1]],  [ ][	][
149]), [], [$2], [$3])])])