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| 1 | +# =========================================================================== |
| 2 | +# https://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 <[email protected]> |
| 37 | +# Copyright (c) 2010 Bastien Chevreux <[email protected]> |
| 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 <https://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 16 |
| 66 | + |
| 67 | +AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB]) |
| 68 | +AC_DEFUN([AX_CHECK_ZLIB], |
| 69 | +# |
| 70 | +# Handle user hints |
| 71 | +# |
| 72 | +[AC_MSG_CHECKING(if zlib is wanted) |
| 73 | +zlib_places="/usr/local /usr /opt/local /sw" |
| 74 | +AC_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, $withval does not exist, checking usual places]) |
| 85 | + fi |
| 86 | +else |
| 87 | + zlib_places= |
| 88 | + AC_MSG_RESULT(no) |
| 89 | +fi], |
| 90 | +[AC_MSG_RESULT(yes)]) |
| 91 | +
|
| 92 | +# |
| 93 | +# Locate zlib, if wanted |
| 94 | +# |
| 95 | +if test -n "${zlib_places}" |
| 96 | +then |
| 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${ZLIB_HOME}/include" |
| 110 | + fi |
| 111 | + AC_LANG_PUSH([C]) |
| 112 | + AC_CHECK_LIB([z], [inflateEnd], [zlib_cv_libz=yes], [zlib_cv_libz=no]) |
| 113 | + AC_CHECK_HEADER([zlib.h], [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no]) |
| 114 | + AC_LANG_POP([C]) |
| 115 | + if test "$zlib_cv_libz" = "yes" && test "$zlib_cv_zlib_h" = "yes" |
| 116 | + then |
| 117 | + # |
| 118 | + # If both library and header were found, action-if-found |
| 119 | + # |
| 120 | + m4_ifblank([$1],[ |
| 121 | + CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include" |
| 122 | + LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib" |
| 123 | + LIBS="-lz $LIBS" |
| 124 | + AC_DEFINE([HAVE_LIBZ], [1], |
| 125 | + [Define to 1 if you have `z' library (-lz)]) |
| 126 | + ],[ |
| 127 | + # Restore variables |
| 128 | + LDFLAGS="$ZLIB_OLD_LDFLAGS" |
| 129 | + CPPFLAGS="$ZLIB_OLD_CPPFLAGS" |
| 130 | + $1 |
| 131 | + ]) |
| 132 | + else |
| 133 | + # |
| 134 | + # If either header or library was not found, action-if-not-found |
| 135 | + # |
| 136 | + m4_default([$2],[ |
| 137 | + AC_MSG_ERROR([either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib]) |
| 138 | + ]) |
| 139 | + fi |
| 140 | +fi |
| 141 | +]) |
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