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Diffstat (limited to 'aclocal/ax_lib_zlib.m4')
| -rw-r--r-- | aclocal/ax_lib_zlib.m4 | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/aclocal/ax_lib_zlib.m4 b/aclocal/ax_lib_zlib.m4 new file mode 100644 index 000000000..40e96df97 --- /dev/null +++ b/aclocal/ax_lib_zlib.m4 @@ -0,0 +1,169 @@ +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 $ZLIB_ROOT environment variable. +dnl +dnl This macro calls: +dnl AC_SUBST(ZLIB_CPPFLAGS) +dnl AC_SUBST(ZLIB_LDFLAGS) +dnl AC_SUBST(ZLIB_LIBS) +dnl +dnl And (if zlib is found): +dnl AC_DEFINE(HAVE_ZLIB) +dnl +dnl It also leaves the shell variables "success" and "ax_have_zlib" +dnl set to "yes" or "no". +dnl +dnl NOTE: This macro does not currently work for cross-compiling, +dnl but it can be easily modified to allow it. (grep "cross"). +dnl +dnl @category InstalledPackages +dnl @category C +dnl @author David Reiss <dreiss@facebook.com> +dnl @version 2007-09-12 +dnl @license AllPermissive + +dnl Input: ax_zlib_path, WANT_ZLIB_VERSION +dnl Output: success=yes/no +AC_DEFUN([AX_LIB_ZLIB_DO_CHECK], + [ + # Save our flags. + CPPFLAGS_SAVED="$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 $ZLIB_LIBS" + export CPPFLAGS + export LDFLAGS + export LIBS + export LD_LIBRARY_PATH + + success=no + + # Compile, link, and run the program. This checks: + # - zlib.h is available for including. + # - zlibVersion() is available for linking. + # - ZLIB_VERNUM is greater than or equal to the desired version. + # - ZLIB_VERSION (defined in zlib.h) matches zlibVersion() + # (defined in the library). + AC_LANG_PUSH([C]) + dnl This can be changed to AC_LINK_IFELSE if you are cross-compiling. + AC_RUN_IFELSE([AC_LANG_PROGRAM([[ + #include <zlib.h> + #if ZLIB_VERNUM >= 0x$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 "$withval" = "xno"; then + want_zlib="no" + elif test "$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 + + ]) |