| dnl @synopsis AX_LIB_ZLIB([MINIMUM-VERSION]) |
| dnl |
| dnl Test for the libz library of a particular version (or newer). |
| dnl |
| dnl If no path to the installed zlib is given, the macro will first try |
| dnl using no -I or -L flags, then searches under /usr, /usr/local, /opt, |
| dnl and /opt/zlib. |
| dnl If these all fail, it will try the $ZLIB_ROOT environment variable. |
| dnl |
| dnl This macro calls: |
| dnl AC_SUBST(ZLIB_CPPFLAGS) |
| dnl AC_SUBST(ZLIB_LDFLAGS) |
| dnl AC_SUBST(ZLIB_LIBS) |
| dnl |
| dnl And (if zlib is found): |
| dnl AC_DEFINE(HAVE_ZLIB) |
| dnl |
| dnl It also leaves the shell variables "success" and "ax_have_zlib" |
| dnl set to "yes" or "no". |
| dnl |
| dnl NOTE: This macro does not currently work for cross-compiling, |
| dnl but it can be easily modified to allow it. (grep "cross"). |
| dnl |
| dnl @category InstalledPackages |
| dnl @category C |
| dnl @version 2007-09-12 |
| dnl @license AllPermissive |
| dnl |
| dnl Copyright (C) 2009 David Reiss |
| dnl Copying and distribution of this file, with or without modification, |
| dnl are permitted in any medium without royalty provided the copyright |
| dnl notice and this notice are preserved. |
| |
| dnl Input: ax_zlib_path, WANT_ZLIB_VERSION |
| dnl Output: success=yes/no |
| AC_DEFUN([AX_LIB_ZLIB_DO_CHECK], |
| [ |
| # Save our flags. |
| CPPFLAGS_SAVED="$CPPFLAGS" |
| LDFLAGS_SAVED="$LDFLAGS" |
| LIBS_SAVED="$LIBS" |
| LD_LIBRARY_PATH_SAVED="$LD_LIBRARY_PATH" |
| |
| # Set our flags if we are checking a specific directory. |
| if test -n "$ax_zlib_path" ; then |
| ZLIB_CPPFLAGS="-I$ax_zlib_path/include" |
| ZLIB_LDFLAGS="-L$ax_zlib_path/lib" |
| LD_LIBRARY_PATH="$ax_zlib_path/lib:$LD_LIBRARY_PATH" |
| else |
| ZLIB_CPPFLAGS="" |
| ZLIB_LDFLAGS="" |
| fi |
| |
| # Required flag for zlib. |
| ZLIB_LIBS="-lz" |
| |
| # Prepare the environment for compilation. |
| CPPFLAGS="$CPPFLAGS $ZLIB_CPPFLAGS" |
| LDFLAGS="$LDFLAGS $ZLIB_LDFLAGS" |
| LIBS="$LIBS $ZLIB_LIBS" |
| export CPPFLAGS |
| export LDFLAGS |
| export LIBS |
| export LD_LIBRARY_PATH |
| |
| success=no |
| |
| # Compile, link, and run the program. This checks: |
| # - zlib.h is available for including. |
| # - zlibVersion() is available for linking. |
| # - ZLIB_VERNUM is greater than or equal to the desired version. |
| # - ZLIB_VERSION (defined in zlib.h) matches zlibVersion() |
| # (defined in the library). |
| AC_LANG_PUSH([C]) |
| dnl This can be changed to AC_LINK_IFELSE if you are cross-compiling. |
| AC_LINK_IFELSE([AC_LANG_PROGRAM([[ |
| #include <zlib.h> |
| #if ZLIB_VERNUM >= 0x$WANT_ZLIB_VERSION |
| #else |
| # error zlib is too old |
| #endif |
| ]], [[ |
| const char* lib_version = zlibVersion(); |
| const char* hdr_version = ZLIB_VERSION; |
| for (;;) { |
| if (*lib_version != *hdr_version) { |
| /* If this happens, your zlib header doesn't match your zlib */ |
| /* library. That is really bad. */ |
| return 1; |
| } |
| if (*lib_version == '\0') { |
| break; |
| } |
| lib_version++; |
| hdr_version++; |
| } |
| return 0; |
| ]])], [ |
| success=yes |
| ]) |
| AC_LANG_POP([C]) |
| |
| # Restore flags. |
| CPPFLAGS="$CPPFLAGS_SAVED" |
| LDFLAGS="$LDFLAGS_SAVED" |
| LIBS="$LIBS_SAVED" |
| LD_LIBRARY_PATH="$LD_LIBRARY_PATH_SAVED" |
| ]) |
| |
| |
| AC_DEFUN([AX_LIB_ZLIB], |
| [ |
| |
| dnl Allow search path to be overridden on the command line. |
| AC_ARG_WITH([zlib], |
| AS_HELP_STRING([--with-zlib@<:@=DIR@:>@], [use zlib (default is yes) - it is possible to specify an alternate root directory for zlib]), |
| [ |
| if test "x$withval" = "xno"; then |
| want_zlib="no" |
| elif test "x$withval" = "xyes"; then |
| want_zlib="yes" |
| ax_zlib_path="" |
| else |
| want_zlib="yes" |
| ax_zlib_path="$withval" |
| fi |
| ], |
| [want_zlib="yes" ; ax_zlib_path="" ]) |
| |
| |
| if test "$want_zlib" = "yes"; then |
| # Parse out the version. |
| zlib_version_req=ifelse([$1], ,1.2.3,$1) |
| zlib_version_req_major=`expr $zlib_version_req : '\([[0-9]]*\)'` |
| zlib_version_req_minor=`expr $zlib_version_req : '[[0-9]]*\.\([[0-9]]*\)'` |
| zlib_version_req_patch=`expr $zlib_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'` |
| if test -z "$zlib_version_req_patch" ; then |
| zlib_version_req_patch="0" |
| fi |
| WANT_ZLIB_VERSION=`expr $zlib_version_req_major \* 1000 \+ $zlib_version_req_minor \* 100 \+ $zlib_version_req_patch \* 10` |
| |
| AC_MSG_CHECKING(for zlib >= $zlib_version_req) |
| |
| # Run tests. |
| if test -n "$ax_zlib_path"; then |
| AX_LIB_ZLIB_DO_CHECK |
| else |
| for ax_zlib_path in "" /usr /usr/local /opt /opt/zlib "$ZLIB_ROOT" ; do |
| AX_LIB_ZLIB_DO_CHECK |
| if test "$success" = "yes"; then |
| break; |
| fi |
| done |
| fi |
| |
| if test "$success" != "yes" ; then |
| AC_MSG_RESULT(no) |
| ZLIB_CPPFLAGS="" |
| ZLIB_LDFLAGS="" |
| ZLIB_LIBS="" |
| else |
| AC_MSG_RESULT(yes) |
| AC_DEFINE(HAVE_ZLIB,,[define if zlib is available]) |
| fi |
| |
| ax_have_zlib="$success" |
| |
| AC_SUBST(ZLIB_CPPFLAGS) |
| AC_SUBST(ZLIB_LDFLAGS) |
| AC_SUBST(ZLIB_LIBS) |
| fi |
| |
| ]) |
