RE: Envrionment Variable Problems

[Dave Korn]

On 31 January 2008 17:21, wdouglass wrote:

> Defined in the make system i am working with is the following environment
> variable:
> 
> ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS)
> 
> Under certain conditions (specifically relative addressing of .c files that
> aren't in the same directory as the makefile), Make drops the first part of
> this variable, leaving me with just $(CFLAGS) and $(GENDEPFLAGS), and my
> compile fails because it doesn't get -mmcu. Has anyone run into a problem
> like this? 

  Nope, but my guess would be that the presence or absence of a path makes a
difference in which rule gets invoked to build the .o from the .c file, and
this other rule uses $(CFLAGS) $(GENDEPFLAGS) when it should perhaps be using
$(ALL_CFLAGS).

> if not, does any know any general way of debugging a complex
> makefile system? the best i've got is attempting to trace through using
> 'make -n' which is tedious and not very helpful.

  See http://bashdb.sourceforge.net/remake/.

    cheers,
      DaveK
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