Re: Conditional target

[Ralf Wildenhues]

* Sergio Belkin wrote on Thu, Jan 27, 2011 at 04:40:10AM CET:
> tests = $(EXTRA_PROGRAMS)

> if forcestatic
> tests: LIBS += $(STATIC_RESOLV)
> end if
> 
> The problem is that automake it complains that .
> 
> tests was already defined in condition forcestatic, which is included
> in condition TRUE ...
> Makefile.am:150: ... `tests' previously defined here

(besides the typo that was already noted:)

Automake does not understand GNU make-style target-specific variable
settings
  target: variable = setting
  target: variable += setting

What it does interpret is Automake conditionals that are evaluated at
config.status time.  And it interprets += itself by flattening it:

  variable = foo
  if COND
  variable += bar
  endif

will be translated to something like
  variable = foo $(am__some_internal_helper_var1)
  @address@hidden = bar

and config.status substitutes @COND_TRUE@ with '#' or '' depending on
whether the condition is true at configure time.

Hope that helps.

Cheers,
Ralf