please review fix for 7116322, enhance javac make rule with a little bit of instrumentation

[Stuart Marks]

Please review this change to add to the javac make rule some messages about the 
number of files being compiled, the current working directory, and a new 
message to demarcate the end of javac output.

This will help capture and analyze javac output, in particular, warning messages.

Thanks.

s'marks


diff -r 6fbd69f8e3ab make/common/Rules.gmk
--- a/make/common/Rules.gmk	Fri Nov 18 09:03:43 2011 +0000
+++ b/make/common/Rules.gmk	Mon Nov 28 16:34:34 2011 -0800
@@ -236,9 +236,10 @@
  	@if [ `$(CAT) $<.filtered | $(WC) -l` -ge 1 ] ; then \
  	  $(ECHO) "# Java sources to be compiled: (listed in file $<)"; \
  	  $(CAT) $<.filtered; \
-	  $(ECHO) "# Running javac:"; \
+	  $(ECHO) "# Running javac: `$(WC) -l < $<.filtered` files; in `pwd`"; \
  	  $(ECHO) $(JAVAC_CMD) -sourcepath "$(SOURCEPATH)" -d $(CLASSDESTDIR) 
@$<.filtered; \
  	  $(JAVAC_CMD) -sourcepath "$(SOURCEPATH)" -d $(CLASSDESTDIR) @$<.filtered; \
+	  $(ECHO) "# javac finished"; \
  	fi
  	@$(java-vm-cleanup)