Re: Question...

[Paul D. Smith]

%% "Wagner, Phillip W." <address@hidden> writes:

  wpw> 1. While using the -win32 shell how does one correctly expand an
  wpw>    environment variable for usage on the command line.  The
  wpw>    %DOS_VARIABLE% doesn't always expand when executing a command.
  wpw>    It appears to still be passing commands through the BASH shell
  wpw>    though the --win32 option is selected.

You should ask Windows questions on the address@hidden mailing list;
there are more Windows-knowledgeable folks there.

  wpw> 2. I am dealing with a compiler that will create a target file (
  wpw>    .i or .obj) with a zero size when it errors.  I need to allow
  wpw>    make to execute with errors suppressed as "acceptable"
  wpw>    warnings occur that stop make.  Is there a way that make would
  wpw>    be able to check for files with 0 size to force them to be
  wpw>    rebuilt?  Otherwise with the correct file date time stamp make
  wpw>    will consider the files complete and not try a rebuild.

You will have to change the rule that you use to detect this situation
and remove the file for you.  If you were using a UNIX shell I'd suggest
something like this:

  %.o : %.c
        @echo $(COMPILE.c) -o $@ -c $<; \
          $(COMPILE.c) -o $@ -c $< && exit 0; \
          r=$$?; \
          rm -f $@; \
          exit $$r

If you don't have a UNIX shell you'll have to figure it out yourself.

  wpw> 3. Are there any examples of using the macro definitions to
  wpw>    create a file.  What is needed is the ability to create a file
  wpw>    on the fly that the bind tool will use as an input for the
  wpw>    creation of an OMF (executable) file.

There is no way to create a file from within a makefile, except as part
of a target command script:

  foo:
        echo first line > $@
        echo second line >> $@
        echo third line >> $@

etc.  Or, you could try using the $(shell ...) function but you'd
probably run into command line length limitations there as well.

-- 
-------------------------------------------------------------------------------
 Paul D. Smith <address@hidden>          Find some GNU make tips at:
 http://www.gnu.org                      http://make.paulandlesley.org
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist