michael@0: dnl This Source Code Form is subject to the terms of the Mozilla Public
michael@0: dnl License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0: dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
michael@0: 
michael@0: dnl Usage: MOZ_ZLIB_CHECK([version])
michael@0: 
michael@0: AC_DEFUN([MOZ_ZLIB_CHECK],
michael@0: [
michael@0: 
michael@0: MOZZLIB=$1
michael@0: 
michael@0: MOZ_ARG_WITH_STRING(system-zlib,
michael@0: [  --with-system-zlib[=PFX]
michael@0:                           Use system libz [installed at prefix PFX]],
michael@0:     ZLIB_DIR=$withval)
michael@0: 
michael@0: if test -z "$MOZ_ZLIB_LIBS$MOZ_ZLIB_CFLAGS$SKIP_LIBRARY_CHECKS"; then
michael@0:     _SAVE_CFLAGS=$CFLAGS
michael@0:     _SAVE_LDFLAGS=$LDFLAGS
michael@0:     _SAVE_LIBS=$LIBS
michael@0: 
michael@0:     if test -n "${ZLIB_DIR}" -a "${ZLIB_DIR}" != "yes"; then
michael@0:         MOZ_ZLIB_CFLAGS="-I${ZLIB_DIR}/include"
michael@0:         MOZ_ZLIB_LIBS="-L${ZLIB_DIR}/lib"
michael@0:         CFLAGS="$MOZ_ZLIB_CFLAGS $CFLAGS"
michael@0:         LDFLAGS="$MOZ_ZLIB_LIBS $LDFLAGS"
michael@0:     fi
michael@0:     if test -z "$ZLIB_DIR" -o "$ZLIB_DIR" = no; then
michael@0:         MOZ_NATIVE_ZLIB=
michael@0:     else
michael@0:         AC_CHECK_LIB(z, gzread, [MOZ_NATIVE_ZLIB=1 MOZ_ZLIB_LIBS="$MOZ_ZLIB_LIBS -lz"],
michael@0:             [MOZ_NATIVE_ZLIB=])
michael@0:         if test "$MOZ_NATIVE_ZLIB" = 1; then
michael@0:             MOZZLIBNUM=`echo $MOZZLIB | awk -F. changequote(<<, >>)'{printf "0x%x\n", (((<<$>>1 * 16 + <<$>>2) * 16) + <<$>>3) * 16 + <<$>>4}'changequote([, ])`
michael@0:             AC_TRY_COMPILE([ #include <stdio.h>
michael@0:                              #include <string.h>
michael@0:                              #include <zlib.h> ],
michael@0:                            [ #if ZLIB_VERNUM < $MOZZLIBNUM
michael@0:                              #error "Insufficient zlib version ($MOZZLIBNUM required)."
michael@0:                              #endif ],
michael@0:                            MOZ_NATIVE_ZLIB=1,
michael@0:                            AC_MSG_ERROR([Insufficient zlib version for --with-system-zlib ($MOZZLIB required)]))
michael@0:         fi
michael@0:     fi
michael@0:     CFLAGS=$_SAVE_CFLAGS
michael@0:     LDFLAGS=$_SAVE_LDFLAGS
michael@0:     LIBS=$_SAVE_LIBS
michael@0: fi
michael@0: 
michael@0: AC_SUBST(MOZ_ZLIB_CFLAGS)
michael@0: AC_SUBST(MOZ_ZLIB_LIBS)
michael@0: AC_SUBST(MOZ_NATIVE_ZLIB)
michael@0: 
michael@0: ])