--- /dev/null
+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
+
+ ])
projects / ceph.git / blobdiff