Re: Generating dynamic dependencies

[Philip Guenther]

On Thu, May 15, 2008 at 12:56 PM, Aspra Flavius Adrian
<address@hidden> wrote:
> I can't generate dependencies automatically like on line 20 in the
> makefile below  because the variable $@ does not yet exist at that
> point. How could I overcome this problem?
...
> 20 $(TESTS): $(shell $(CC) -MM -DHAVE_MAIN address@hidden | sed 's/.*: //g')
> 21      echo "DEPS: " $(shell $(CC) -MM -DHAVE_MAIN address@hidden | sed 
> 's/.*: //g')
> 22      $(CC) $(CFLAGS) -DHAVE_MAIN -o $(DIR_TESTS)$(@F) address@hidden

How about by not trying to generate dependencies during Makefile
parsing?  Let's say you did get what you want working.  Then
*every*time* you run make, it would run *all* the source files through
the dependency generation process.  That would take place even if the
information was completely unnecessary, such as when doing "make
clean".

Instead, I *strongly* suggest that you use the autodependency setup
described by our benevolent maintainer at
      http://make.paulandlesley.org/autodep.html

The setup described there generates dependencies as a side-effect of
compilation, only regenerates them when they're out of date, and never
generates them when they're unneeded.


Philip Guenther