diff options
Diffstat (limited to 'm4/check_zlib.m4')
| -rw-r--r-- | m4/check_zlib.m4 | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/m4/check_zlib.m4 b/m4/check_zlib.m4 new file mode 100644 index 0000000..b02bd33 --- /dev/null +++ b/m4/check_zlib.m4 @@ -0,0 +1,61 @@ +dnl Available from the GNU Autoconf Macro Archive at: +dnl http://www.gnu.org/software/ac-archive/htmldoc/check_zlib.html +dnl +AC_DEFUN([CHECK_ZLIB], +# +# Handle user hints +# +[AC_MSG_CHECKING(if zlib is wanted) +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 "$withval" != no ; then + AC_MSG_RESULT(yes) + ZLIB_HOME="$withval" +else + AC_MSG_RESULT(no) +fi], [ +AC_MSG_RESULT(yes) +ZLIB_HOME=/usr/local +if test ! -f "${ZLIB_HOME}/include/zlib.h" +then + ZLIB_HOME=/usr +fi +]) + +# +# Locate zlib, if wanted +# +if test -n "${ZLIB_HOME}" +then + ZLIB_OLD_LDFLAGS=$LDFLAGS + ZLIB_OLD_CPPFLAGS=$LDFLAGS + LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib" + CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include" + AC_LANG_SAVE + AC_LANG_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_cvs_zlib_h=no]) + AC_LANG_RESTORE + if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes" + then + # + # If both library and header were found, use them + # + AC_CHECK_LIB(z, inflateEnd) + AC_MSG_CHECKING(zlib in ${ZLIB_HOME}) + AC_MSG_RESULT(ok) + else + # + # If either header or library was not found, revert and bomb + # + AC_MSG_CHECKING(zlib in ${ZLIB_HOME}) + LDFLAGS="$ZLIB_OLD_LDFLAGS" + CPPFLAGS="$ZLIB_OLD_CPPFLAGS" + AC_MSG_RESULT(failed) + AC_MSG_ERROR(either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib) + fi +fi + +]) |