dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_prog_javac.html
dnl
AC_DEFUN([AC_PROG_JAVAC],[
AC_REQUIRE([AC_EXEEXT])dnl
if test "x$JAVAPREFIX" = x; then
        test "x$JAVAC" = x && AC_CHECK_PROGS(JAVAC, javac-live javac$EXEEXT "gcj$EXEEXT -C" jikes$EXEEXT ejc$EXEEXT guavac$EXEEXT)
else
        test "x$JAVAC" = x && AC_CHECK_PROGS(JAVAC, javac-live javac$EXEEXT "gcj$EXEEXT -C" jikes$EXEEXT ejc$EXEEXT guavac$EXEEXT, $JAVAPREFIX)
fi
test "x$JAVAC" = x && AC_MSG_ERROR([no acceptable Java compiler found in \$PATH])
dnl AC_PROG_JAVAC_WORKS
(echo "$JAVAC" | grep -e " -C$" >/dev/null 2>/dev/null) && AC_MSG_WARN([
The build seems to be using gcj for bytecode generation.  Some
versions of gcj are known to produce bad bytecode.  See here for a
list of bugs that may be relevant:

"http://gcc.gnu.org/bugzilla/buglist.cgi?component=java&keywords=wrong-code&order=default"

At least bug 19921 is known to affect gjdoc (in Feb 2005).

You may want to set the environment variable JAVAC to an alternate
compiler, such as jikes, to make sure that you end up with valid
bytecode.
]);
AC_PROVIDE([$0])dnl
])