Octave: use pre-compiled headers to speed up test suite, if supported

Examples/test-suite/octave/Makefile.in

@@ -5,6 +5,7 @@
 LANGUAGE     = octave
 OCTAVE       = @OCTAVE@
 SCRIPTSUFFIX = _runme.m
+PCHSUPPORT   = @PCHSUPPORT@
 
 srcdir       = @srcdir@
 top_srcdir   = @top_srcdir@
@@ -61,6 +62,23 @@ CSRCS      = octave_empty.c
 	+$(swig_and_compile_multi_cpp)
 	$(run_testcase)
 
+# Pre-compile Octave headers, if supported
+
+ifeq (yes,$(PCHSUPPORT))
+
+export OCTHEADERSSRC = @top_srcdir@/Lib/octave/octheaders.hpp
+export OCTHEADERS    = @top_builddir@/Examples/test-suite/octave/octheaders.hpp
+export OCTHEADERSGCH = $(OCTHEADERS).gch
+export SWIGOCTHDROPT = -DSWIG_OCTAVE_EXTERNAL_OCTHEADERS
+export IOCTHEADERS   = -I@top_builddir@/Examples/test-suite/octave @PCHINCLUDEARG@ $(OCTHEADERS)@PCHINCLUDEEXT@
+
+$(OCTHEADERSGCH): $(OCTHEADERSSRC)
+	$(MAKE) -f $(top_builddir)/$(EXAMPLES)/Makefile octave_precompile_headers
+
+$(NOT_BROKEN_TEST_CASES) $(BROKEN_TEST_CASES): $(OCTHEADERSGCH)
+
+endif
+
 # Runs the testcase. A testcase is only run if
 # a file is found which has _runme.m appended after the testcase name.
 run_testcase = \