Re: dependencies with @xx@ variables

[Ralf Wildenhues]

Hello Joakim,

* Joakim Tjernlund wrote on Tue, Jan 26, 2010 at 02:20:24PM CET:
> 
> I got this rule in Makfile.am:
>  ldadds_false = $(ldadds_cuappl)
>  ldadds_true = $(ldadds_culess)
> 
>  common_LDADD += $(address@hidden@)
> 
> @CU_LESS@ is either true or false.
> 
> $(address@hidden@) is omitted in am__DEPENDENCIES_1 so
> if any lib mentioned in ldadds_cuappl or ldadds_culess changes
> no rebuild is generated.
> 
> if I change $(address@hidden@) $(ldadds_false) it makes it into
> am__DEPENDENCIES_1 and a rebuild is generated.
> 
> Is the above a bug?

No.  When automake cannot see a literal in a *_LDADD or *_LIBADD
statement, it cannot interpolate it to the respective *_DEPENDENCIES
variable: non-literal content might expand to stuff like '-lm' or
'-L/foo' which would cause 'make' to barf if listed as prerequisites
somewhere.

> How do I workaround it?

Build the *_DEPENDENCIES variable yourself.  You have to take care of
all of its entries if you do so, it overwrites, not appends to, any
automake-computed library dependencies.

Cheers,
Ralf