[patch request] don't run ecj on auto generated files

[Stan Cox <scox at redhat dot com>]

antlr generates files which generate warnings from ecj, for example 
unreferenced variables.  The current strategy is to use sed scripts to 
postprocess the sources.  However, this is error prone and requires 
constant tweaking.  Are there any objections to only running ecj on 
top_srcdir *.java files and not running ecj on top_builddir *.java 
files?  I think this change would mostly effect antlr (Cpp*), but here 
is the entire list of autogenerated files:
AT.java                 ELF.java                SHF.java
Build.java              EM.java                 SHN.java
Config.java             ET.java                 SHT.java
CppLexer.java           EV.java                 Sig.java
CppParser.java          JUnitTests.java         STB.java
CppParserTokenTypes.jav NT.java                 STT.java
CppTreeParser.java      PF.java                 STV.java
CppTreeParserTokenTypes PowerPC.java            SyscallNum.java
DW.java                 PT.java                 TestRunner.java
EI.java

Here is a patch that will only run ecj on top_srcdir.

/NotBackedUp/scox/src/common /NotBackedUp/scox/bld/i386-redhat-linux/frysk-core /NotBackedUp/scox/bld/i386-redhat-linux /NotBackedUp/scox/bld /NotBackedUp ~
Index: Makefile.rules
===================================================================
RCS file: /cvs/frysk/frysk-common/Makefile.rules,v
retrieving revision 1.126
diff -u -p -r1.126 Makefile.rules
--- Makefile.rules	11 Jul 2006 20:53:29 -0000	1.126
+++ Makefile.rules	27 Jul 2006 23:26:02 -0000
@@ -497,10 +497,10 @@ distclean-cvsignored:
 # directories (as occurs when building in the source tree).  An
 # explicit clean rule is needed as CLEANFILES can't handle directories.
 
-CLEANFILES += files.list
+CLEANFILES += files.list genfiles.list
 files.list:
 	topdirs= ; \
-	for d in $(top_builddir) $(top_srcdir) ; do \
+	for d in $(top_srcdir) ; do \
 	    p=`cd $$d && pwd` ; \
 	    case " $$topdirs " in \
 	        *$$p* ) continue ;; \
@@ -513,12 +513,30 @@ files.list:
 	    done \
 	done | sort > $@.tmp
 	mv $@.tmp $@
-${GEN_DIRNAME}.jar: files.list
+genfiles.list:
+	topdirs= ; \
+	for d in $(top_builddir) ; do \
+	    p=`cd $$d && pwd` ; \
+	    case " $$topdirs " in \
+	        *$$p* ) continue ;; \
+	    esac ; \
+	    topdirs="$$dirs $$p" ; \
+	    for g in $(GEN_DIRS) ; do \
+		find $$p/$$g \
+		    -name '*#*' -prune -o \
+		    -name '[A-Za-z]*.java' -print ; \
+	    done \
+	done | sort > $@.tmp
+	mv $@.tmp $@
+${GEN_DIRNAME}.jar: files.list genfiles.list
 	rm -rf $(GEN_CLASSDIR)
 	mkdir -p $(GEN_CLASSDIR)
 	$(JAVAC) -d $(GEN_CLASSDIR) $(JAVACFLAGS) \
 		@$(top_builddir)/files.list \
 		2>&1 | tee $*.log
+	$(JAVAC) -d $(GEN_CLASSDIR) $(JAVACFLAGS) \
+		@$(top_builddir)/genfiles.list \
+		2>&1 | tee --append $*.log
 	if test -s $*.log ; \
 	then rm $*.log ; false ; \
 	fi