Re: [Javaweb-people] build tools

[Nic Ferrier]

Brian Jones <address@hidden> writes:

> Nic Ferrier <address@hidden> writes: 
>  
> > After a bit more thought I have achieved what I was trying to do. 
> >  
> > For those interested here's the important bit of my makefile. I'm 
> > basically using a "cat" of a prepared filelist to act as the list 
> > variable that I was talking about. 
> >  
> >  
> > # This rule builds the destination directory for compiles. 
> > $(DESTINATION): 
> >     mkdir $@ 
> >  
> > # This rule recreates the filelist. 
> > # It has the nasty side effect of writing a blank line to the file 
> > # but compilers don't seem to mind that. 
> > init-filelist: 
> >     @echo > filelist 
> >  
> > # A variable to represent the list of all files. 
> > DEPEND_LIST         = $(shell cat filelist) 
> >  
> >  
> > # The compilation targets. 
> > .PHONY: compile compile-files debug init-filelist 
> >  
> > debug: init-filelist $(DEBUGCLASSES) debug-files 
> >     $(if $(DEPEND_LIST),$(call COMPILE,$(SOURCEDIR))) 
> >  
> > debug-files: 
> >     $(if $(DEPEND_LIST),$(call COMPILE,$(DESTINATION))) 
> >  
> > compile: $(DESTINATION) init-filelist $(DESTCLASSES) compile-files 
> >  
> > compile-files: 
> >     $(if $(DEPEND_LIST),$(call COMPILE,$(DESTINATION))) 
> >  
> >  
> > # Automatically match a source file to it's dependant class file. 
> > $(DESTINATION)/%.class: $(SOURCEDIR)/%.java 
> >     @echo $? >> filelist.mak 
> >  
> > $(SOURCEDIR)/%.class: $(SOURCEDIR)/%.java 
> >     @echo $? >> filelist.mak 
> >  
>  
> Something seems to be missing.  Is filelist.mak == filelist above in 
> setting DEPEND_LIST?  I've not used/seen the $(call COMPILE,  $(VAR)) 
> notation before so I'm not sure about that.  Where are you setting 
> DESTCLASSES? 

Yes... the extract was just an extract... also filelist.mak should be
filelist.

The $(call...) syntax if a function call. Variables can have
parameter references in them, eg:

COMPILE = $(JAVAC) $(JAVAC_OPTS) -d $(1) -classpath $(call MK-CLASSPATH,$(1)) 
@filelist

On a call to COMPILE you pass in the destination which is then
interpolated into the expansion of the variable, at the point where
$(1) says it should be.


The trouble with this is that it's a lot to add to a makefile. And it
still doesn't work in a make natural way.

For example, with the above, if you say this:


   make source/somepackage/SomeClass.class

You'll just get a filelist created, it won't compile the source file
associated with the class.

The only way to fix it is via list pattern match targets. I doubt
whether they will be added to Make, even if they were, you then have
to rely on everybody using the new Make.


Nic