if --enable-java-bindings then check a javac exists

configure.ac

@@ -5244,6 +5244,12 @@ dnl  Java bindings
 dnl
 AC_ARG_ENABLE(java-bindings,
   [  --enable-java-bindings  Enable Java bindings (default disabled)])
+if test "${enable-java-bindings}" = "yes"
+then
+  AC_PROG_JAVA_CC(javac)
+  AC_PROG_JAVAC
+  AC_PROG_JAVA
+fi
 AM_CONDITIONAL(BUILD_JAVA, [test "${enable_java_bindings}" = "yes"])
 
 dnl

m4/ac_prog_java.m4

+dnl @synopsis AC_PROG_JAVA
+dnl
+dnl Here is a summary of the main macros:
+dnl
+dnl AC_PROG_JAVAC: finds a Java compiler.
+dnl
+dnl AC_PROG_JAVA: finds a Java virtual machine.
+dnl
+dnl AC_CHECK_CLASS: finds if we have the given class (beware of
+dnl CLASSPATH!).
+dnl
+dnl AC_CHECK_RQRD_CLASS: finds if we have the given class and stops
+dnl otherwise.
+dnl
+dnl AC_TRY_COMPILE_JAVA: attempt to compile user given source.
+dnl
+dnl AC_TRY_RUN_JAVA: attempt to compile and run user given source.
+dnl
+dnl AC_JAVA_OPTIONS: adds Java configure options.
+dnl
+dnl AC_PROG_JAVA tests an existing Java virtual machine. It uses the
+dnl environment variable JAVA then tests in sequence various common
+dnl Java virtual machines. For political reasons, it starts with the
+dnl free ones. You *must* call [AC_PROG_JAVAC] before.
+dnl
+dnl If you want to force a specific VM:
+dnl
+dnl - at the configure.in level, set JAVA=yourvm before calling
+dnl AC_PROG_JAVA
+dnl
+dnl   (but after AC_INIT)
+dnl
+dnl - at the configure level, setenv JAVA
+dnl
+dnl You can use the JAVA variable in your Makefile.in, with @JAVA@.
+dnl
+dnl *Warning*: its success or failure can depend on a proper setting of
+dnl the CLASSPATH env. variable.
+dnl
+dnl TODO: allow to exclude virtual machines (rationale: most Java
+dnl programs cannot run with some VM like kaffe).
+dnl
+dnl Note: This is part of the set of autoconf M4 macros for Java
+dnl programs. It is VERY IMPORTANT that you download the whole set,
+dnl some macros depend on other. Unfortunately, the autoconf archive
+dnl does not support the concept of set of macros, so I had to break it
+dnl for submission.
+dnl
+dnl A Web page, with a link to the latest CVS snapshot is at
+dnl <http://www.internatif.org/bortzmeyer/autoconf-Java/>.
+dnl
+dnl This is a sample configure.in Process this file with autoconf to
+dnl produce a configure script.
+dnl
+dnl    AC_INIT(UnTag.java)
+dnl
+dnl    dnl Checks for programs.
+dnl    AC_CHECK_CLASSPATH
+dnl    AC_PROG_JAVAC
+dnl    AC_PROG_JAVA
+dnl
+dnl    dnl Checks for classes
+dnl    AC_CHECK_RQRD_CLASS(org.xml.sax.Parser)
+dnl    AC_CHECK_RQRD_CLASS(com.jclark.xml.sax.Driver)
+dnl
+dnl    AC_OUTPUT(Makefile)
+dnl
+dnl @category Java
+dnl @author Stephane Bortzmeyer <bortzmeyer@pasteur.fr>
+dnl @version 2000-07-19
+dnl @license GPLWithACException
+
+AC_DEFUN([AC_PROG_JAVA],[
+AC_REQUIRE([AC_EXEEXT])dnl
+if test x$JAVAPREFIX = x; then
+        test x$JAVA = x && AC_CHECK_PROGS(JAVA, kaffe$EXEEXT java$EXEEXT)
+else
+        test x$JAVA = x && AC_CHECK_PROGS(JAVA, kaffe$EXEEXT java$EXEEXT, $JAVAPREFIX)
+fi
+test x$JAVA = x && AC_MSG_ERROR([no acceptable Java virtual machine found in \$PATH])
+AC_PROG_JAVA_WORKS
+AC_PROVIDE([$0])dnl
+])

m4/ac_prog_java_cc.m4

+dnl @synopsis AC_PROG_JAVA_CC
+dnl
+dnl Finds the appropriate java compiler on your path. By preference the
+dnl java compiler is gcj, then jikes then javac.
+dnl
+dnl The macro can take one argument specifying a space separated list
+dnl of java compiler names.
+dnl
+dnl For example:
+dnl
+dnl   AC_PROG_JAVA_CC(javac, gcj)
+dnl
+dnl The macro also sets the compiler options variable: JAVA_CC_OPTS to
+dnl something sensible:
+dnl
+dnl  - for GCJ it sets it to: @GCJ_OPTS@
+dnl    (if GCJ_OPTS is not yet defined then it is set to "-C")
+dnl
+dnl  - no other compiler has applicable options yet
+dnl
+dnl Here's an example configure.in:
+dnl
+dnl   AC_INIT(Makefile.in)
+dnl   AC_PROG_JAVA_CC()
+dnl   AC_OUTPUT(Makefile)
+dnl   dnl End.
+dnl
+dnl And here's the start of the Makefile.in:
+dnl
+dnl   PROJECT_ROOT      := @srcdir@
+dnl   # Tool definitions.
+dnl   JAVAC             := @JAVA_CC@
+dnl   JAVAC_OPTS        := @JAVA_CC_OPTS@
+dnl   JAR_TOOL          := @jar_tool@
+dnl
+dnl @category Java
+dnl @author Nic Ferrier <nferrier@tapsellferrier.co.uk>
+dnl @version 2002-03-04
+dnl @license GPLWithACException
+
+# AC_PROG_JAVA_CC([COMPILER ...])
+# --------------------------
+# COMPILER ... is a space separated list of java compilers to search for.
+# This just gives the user an opportunity to specify an alternative
+# search list for the java compiler.
+AC_DEFUN([AC_PROG_JAVA_CC],
+[AC_ARG_VAR([JAVA_CC],                [java compiler command])dnl
+AC_ARG_VAR([JAVA_CC_FLAGS],           [java compiler flags])dnl
+m4_ifval([$1],
+      [AC_CHECK_TOOLS(JAVA_CC, [$1])],
+[AC_CHECK_TOOL(JAVA_CC, gcj)
+if test -z "$JAVA_CC"; then
+  AC_CHECK_TOOL(JAVA_CC, javac)
+fi
+if test -z "$JAVA_CC"; then
+  AC_CHECK_TOOL(JAVA_CC, jikes)
+fi
+])
+
+if test "$JAVA_CC" = "gcj"; then
+   if test "$GCJ_OPTS" = ""; then
+      AC_SUBST(GCJ_OPTS,-C)
+   fi
+   AC_SUBST(JAVA_CC_OPTS, @GCJ_OPTS@,
+        [Define the compilation options for GCJ])
+fi
+test -z "$JAVA_CC" && AC_MSG_ERROR([no acceptable java compiler found in \$PATH])
+])# AC_PROG_JAVA_CC

m4/ac_prog_java_works.m4

+dnl @synopsis AC_PROG_JAVA_WORKS
+dnl
+dnl Internal use ONLY.
+dnl
+dnl Note: This is part of the set of autoconf M4 macros for Java
+dnl programs. It is VERY IMPORTANT that you download the whole set,
+dnl some macros depend on other. Unfortunately, the autoconf archive
+dnl does not support the concept of set of macros, so I had to break it
+dnl for submission. The general documentation, as well as the sample
+dnl configure.in, is included in the AC_PROG_JAVA macro.
+dnl
+dnl @category Java
+dnl @author Stephane Bortzmeyer <bortzmeyer@pasteur.fr>
+dnl @version 2000-07-19
+dnl @license GPLWithACException
+
+AC_DEFUN([AC_PROG_JAVA_WORKS], [
+AC_CHECK_PROG(uudecode, uudecode$EXEEXT, yes)
+if test x$uudecode = xyes; then
+AC_CACHE_CHECK([if uudecode can decode base 64 file], ac_cv_prog_uudecode_base64, [
+dnl /**
+dnl  * Test.java: used to test if java compiler works.
+dnl  */
+dnl public class Test
+dnl {
+dnl
+dnl public static void
+dnl main( String[] argv )
+dnl {
+dnl     System.exit (0);
+dnl }
+dnl
+dnl }
+cat << \EOF > Test.uue
+begin-base64 644 Test.class
+yv66vgADAC0AFQcAAgEABFRlc3QHAAQBABBqYXZhL2xhbmcvT2JqZWN0AQAE
+bWFpbgEAFihbTGphdmEvbGFuZy9TdHJpbmc7KVYBAARDb2RlAQAPTGluZU51
+bWJlclRhYmxlDAAKAAsBAARleGl0AQAEKEkpVgoADQAJBwAOAQAQamF2YS9s
+YW5nL1N5c3RlbQEABjxpbml0PgEAAygpVgwADwAQCgADABEBAApTb3VyY2VG
+aWxlAQAJVGVzdC5qYXZhACEAAQADAAAAAAACAAkABQAGAAEABwAAACEAAQAB
+AAAABQO4AAyxAAAAAQAIAAAACgACAAAACgAEAAsAAQAPABAAAQAHAAAAIQAB
+AAEAAAAFKrcAErEAAAABAAgAAAAKAAIAAAAEAAQABAABABMAAAACABQ=
+====
+EOF
+if uudecode$EXEEXT Test.uue; then
+        ac_cv_prog_uudecode_base64=yes
+else
+        echo "configure: __oline__: uudecode had trouble decoding base 64 file 'Test.uue'" >&AC_FD_CC
+        echo "configure: failed file was:" >&AC_FD_CC
+        cat Test.uue >&AC_FD_CC
+        ac_cv_prog_uudecode_base64=no
+fi
+rm -f Test.uue])
+fi
+if test x$ac_cv_prog_uudecode_base64 != xyes; then
+        rm -f Test.class
+        AC_MSG_WARN([I have to compile Test.class from scratch])
+        if test x$ac_cv_prog_javac_works = xno; then
+                AC_MSG_ERROR([Cannot compile java source. $JAVAC does not work properly])
+        fi
+        if test x$ac_cv_prog_javac_works = x; then
+                AC_PROG_JAVAC
+        fi
+fi
+AC_CACHE_CHECK(if $JAVA works, ac_cv_prog_java_works, [
+JAVA_TEST=Test.java
+CLASS_TEST=Test.class
+TEST=Test
+changequote(, )dnl
+cat << \EOF > $JAVA_TEST
+/* [#]line __oline__ "configure" */
+public class Test {
+public static void main (String args[]) {
+        System.exit (0);
+} }
+EOF
+changequote([, ])dnl
+if test x$ac_cv_prog_uudecode_base64 != xyes; then
+        if AC_TRY_COMMAND($JAVAC $JAVACFLAGS $JAVA_TEST) && test -s $CLASS_TEST; then
+                :
+        else
+          echo "configure: failed program was:" >&AC_FD_CC
+          cat $JAVA_TEST >&AC_FD_CC
+          AC_MSG_ERROR(The Java compiler $JAVAC failed (see config.log, check the CLASSPATH?))
+        fi
+fi
+if AC_TRY_COMMAND($JAVA $JAVAFLAGS $TEST) >/dev/null 2>&1; then
+  ac_cv_prog_java_works=yes
+else
+  echo "configure: failed program was:" >&AC_FD_CC
+  cat $JAVA_TEST >&AC_FD_CC
+  AC_MSG_ERROR(The Java VM $JAVA failed (see config.log, check the CLASSPATH?))
+fi
+rm -fr $JAVA_TEST $CLASS_TEST Test.uue
+])
+AC_PROVIDE([$0])dnl
+]
+)

m4/ac_prog_javac.m4

+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, "gcj$EXEEXT -C" guavac$EXEEXT jikes$EXEEXT javac$EXEEXT)
+else
+        test "x$JAVAC" = x && AC_CHECK_PROGS(JAVAC, "gcj$EXEEXT -C" guavac$EXEEXT jikes$EXEEXT javac$EXEEXT, $JAVAPREFIX)
+fi
+test "x$JAVAC" = x && AC_MSG_ERROR([no acceptable Java compiler found in \$PATH])
+AC_PROG_JAVAC_WORKS
+AC_PROVIDE([$0])dnl
+])

m4/ac_prog_javac_works.m4

+dnl Available from the GNU Autoconf Macro Archive at:
+dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_prog_javac_works.html
+dnl
+AC_DEFUN([AC_PROG_JAVAC_WORKS],[
+AC_CACHE_CHECK([if $JAVAC works], ac_cv_prog_javac_works, [
+JAVA_TEST=Test.java
+CLASS_TEST=Test.class
+cat << \EOF > $JAVA_TEST
+/* [#]line __oline__ "configure" */
+public class Test {
+}
+EOF
+if AC_TRY_COMMAND($JAVAC $JAVACFLAGS $JAVA_TEST) >/dev/null 2>&1; then
+  ac_cv_prog_javac_works=yes
+else
+  AC_MSG_ERROR([The Java compiler $JAVAC failed (see config.log, check the CLASSPATH?)])
+  echo "configure: failed program was:" >&AC_FD_CC
+  cat $JAVA_TEST >&AC_FD_CC
+fi
+rm -f $JAVA_TEST $CLASS_TEST
+])
+AC_PROVIDE([$0])dnl
+])

m4/ac_prog_javah.m4

+dnl @synopsis AC_PROG_JAVAH
+dnl
+dnl AC_PROG_JAVAH tests the availability of the javah header generator
+dnl and looks for the jni.h header file. If available, JAVAH is set to
+dnl the full path of javah and CPPFLAGS is updated accordingly.
+dnl
+dnl @category Java
+dnl @author Luc Maisonobe <luc@spaceroots.org>
+dnl @version 2002-03-25
+dnl @license AllPermissive
+
+AC_DEFUN([AC_PROG_JAVAH],[
+AC_REQUIRE([AC_CANONICAL_SYSTEM])dnl
+AC_REQUIRE([AC_PROG_CPP])dnl
+AC_PATH_PROG(JAVAH,javah)
+if test x"`eval 'echo $ac_cv_path_JAVAH'`" != x ; then
+  AC_TRY_CPP([#include <jni.h>],,[
+    ac_save_CPPFLAGS="$CPPFLAGS"
+changequote(, )dnl
+    ac_dir=`echo $ac_cv_path_JAVAH | sed 's,\(.*\)/[^/]*/[^/]*$,\1/include,'`
+    ac_machdep=`echo $build_os | sed 's,[-0-9].*,,' | sed 's,cygwin,win32,'`
+changequote([, ])dnl
+    CPPFLAGS="$ac_save_CPPFLAGS -I$ac_dir -I$ac_dir/$ac_machdep"
+    AC_TRY_CPP([#include <jni.h>],
+               ac_save_CPPFLAGS="$CPPFLAGS",
+               AC_MSG_WARN([unable to include <jni.h>]))
+    CPPFLAGS="$ac_save_CPPFLAGS"])
+fi])