Changes to m4/ax_check_zlib.m4. All files

m4/ax_check_zlib.m4

new file mode 100644@@ -0,0 +1,140 @@+# ===========================================================================+#      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, 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 <loic@senga.org>+#   Copyright (c) 2010 Bastien Chevreux <bach@chevreux.org>+#+#   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++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/homebrew /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 "${ZLIB_HOME}"; then+    LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"+    CPPFLAGS="$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${ZLIB_HOME}/include"+                LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"+                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+])