Octave: more robust configuration

- do not rely on --eval argument to find mkoctfile, instead assume it
  is in the same directory as octave itself (which it always should be)
- check Octave options to make sure they are supported, including
  --no-window-system to prevent warnings if building without an X server
- disable Octave if any vital tests fail

Examples/Makefile.in

@@ -398,7 +398,7 @@ python_clean:
 ##################################################################
 
 # Make sure these locate your Octave installation
-OCTAVE        = OCTAVE_HISTFILE=/dev/null @OCTAVE@ -qfH
+OCTAVE        = OCTAVE_HISTFILE=/dev/null @OCTAVE@
 OCTAVE_CXX    = $(DEFS) @OCTAVE_CPPFLAGS@ @OCTAVE_CXXFLAGS@
 
 # Extra Octave specific dynamic linking options

Examples/test-suite/octave/Makefile.in

@@ -3,7 +3,7 @@
 #######################################################################
 
 LANGUAGE     = octave
-OCTAVE       = @OCTAVE@ -qf
+OCTAVE       = @OCTAVE@
 SCRIPTSUFFIX = _runme.m
 srcdir       = @srcdir@
 top_srcdir   = @top_srcdir@

configure.ac

@@ -938,7 +938,7 @@ if test x"${OCTAVEBIN}" = xno -o x"${with_alllang}" = xno ; then
 
 # First figure out what the name of Octave is
 elif test "x$OCTAVEBIN" = xyes; then
-   AC_CHECK_PROGS(OCTAVE, octave)
+   AC_PATH_PROG(OCTAVE, [octave])
 
 else
    OCTAVE="$OCTAVEBIN"
@@ -946,31 +946,45 @@ fi
 
 if test -n "$OCTAVE"; then
    AC_MSG_CHECKING([for mkoctfile])
-   AS_IF([test "x`${OCTAVE} -qfH --eval 'mkoctfile -p CXX' 2>/dev/null`" != x],[
-     AC_MSG_RESULT([yes])
+   mkoctfile="`dirname ${OCTAVE}`/mkoctfile"
+   AS_IF([test -x "${mkoctfile}"],[
+      AC_MSG_RESULT([${mkoctfile}])
    ],[
-     AC_MSG_ERROR([mkoctfile is not installed])
+      AC_MSG_RESULT([not found, disabling Octave])
+      OCTAVE=
    ])
+fi
+if test -n "$OCTAVE"; then
    AC_MSG_CHECKING([for Octave preprocessor flags])
    OCTAVE_CPPFLAGS=
    for n in CPPFLAGS INCFLAGS; do
-     OCTAVE_CPPFLAGS="${OCTAVE_CPPFLAGS} "`$OCTAVE -qfH --eval "mkoctfile -p $n"`
+     OCTAVE_CPPFLAGS="${OCTAVE_CPPFLAGS} "`${mkoctfile} -p $n`
    done
-   AC_MSG_RESULT($OCTAVE_CPPFLAGS)
+   AC_MSG_RESULT([$OCTAVE_CPPFLAGS])
    AC_MSG_CHECKING([for Octave compiler flags])
    OCTAVE_CXXFLAGS=
    for n in ALL_CXXFLAGS; do
-     OCTAVE_CXXFLAGS="${OCTAVE_CXXFLAGS} "`$OCTAVE -qfH --eval "mkoctfile -p $n"`
+     OCTAVE_CXXFLAGS="${OCTAVE_CXXFLAGS} "`${mkoctfile} -p $n`
    done
-   AC_MSG_RESULT($OCTAVE_CXXFLAGS)
+   AC_MSG_RESULT([$OCTAVE_CXXFLAGS])
    AC_MSG_CHECKING([for Octave linker flags])
    OCTAVE_LDFLAGS=
    for n in RDYNAMIC_FLAG LFLAGS RLD_FLAG OCTAVE_LIBS LIBS; do
-     OCTAVE_LDFLAGS="${OCTAVE_LDFLAGS} "`$OCTAVE -qfH --eval "mkoctfile -p $n"`
+     OCTAVE_LDFLAGS="${OCTAVE_LDFLAGS} "`${mkoctfile} -p $n`
+   done
+   AC_MSG_RESULT([$OCTAVE_LDFLAGS])
+fi
+if test -n "$OCTAVE"; then
+   for octave_opt in --silent --norc --no-history --no-window-system; do
+      AC_MSG_CHECKING([if Octave option '${octave_opt}' is supported])
+      ${OCTAVE} ${octave_opt} /dev/null >/dev/null 2>&1
+      AS_IF([test $? -eq 0],[
+         AC_MSG_RESULT([yes])
+         OCTAVE="${OCTAVE} ${octave_opt}"
+      ],[
+         AC_MSG_RESULT([no])
+      ])
    done
-   AC_MSG_RESULT($OCTAVE_LDFLAGS)
-else
-   AC_MSG_RESULT(could not figure out how to run octave)
 fi
 
 AC_SUBST(OCTAVE)