Re: .DEFAULT: rule

[Andrew Cagney <cagney at redhat dot com>]

Tom,

As in the contents of the .Po file?  Reads gcc man page, the -MP 
option.  This is a typical .Po file:

frysk/proc/Id.o: ../../frysk/frysk-core/frysk/proc/Id.java \
 ../frysk-imports/jline.jar ../frysk-imports/antlr.jar \
 ../frysk-imports/junit.jar ../frysk-imports/getopt.jar \
 ../frysk-imports/jdom.jar ../frysk-imports/cdtparser.jar \
 /usr/share/java/libgcj-4.1.1.jar

below you'll see the rule being used to generate it (had to rewrite 
automake's to to work around gcj bugs).  It includes -MP option to 
generate those phony rules, but they are not there.

Andrew

# Given a .java file convert it to a .o file.
# XXX: GCJ has a bug where it totally scrambles nested classes with
# identical names.  Reject any code with duplicate class names.
# XXX: GCJ has a bug where, when given a -Werror fail, it still exits
# with success.  Hack around this by saving the message in a log file
# and then checking that it is empty.
.java.o:
       dups=`$(JV_SCAN) --list-class $< \
               | tr '[ ]' '[\n]' \
               | sed -n -e 's,^.*$$\([A-Z]\),\1,p' \
               | sort | uniq -d` ; \
       if test x"$$dups" != x ; then echo "Duplicate class names tickle 
a GCJ bug: $$dups" ; exit 1 ; fi
       depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`; \
       if $(GCJCOMPILE) -MT $@ -MD -MP -MF "$$depbase.Tpo" -c -o $@ $< 
2>&1 | tee $*.log && test ! -s $*.log ; \
       then mv -f "$$depbase.Tpo" "$$depbase.Po"; else rm -f 
"$$depbase.Tpo"; exit 1; fi
       rm -f $*.log



> The dependency file ought to contain dummy targets for all the headers.
> See the automake dependency tracking white paper (well, used to be a
> white paper, now moved into the manual)
>
> http://sourceware.org/automake/automake.html#Dependency-Tracking-Evolution
>
> If you aren't seeing these dummy targets, something is wrong.
>
> Tom
>