Re: make clarification

[Paul Smith]

On Tue, 2011-05-17 at 14:40 -0700, rajesh upadhayaya wrote:
> I am trying to compile using a Gnu make under Linux. This make gives below 
> error/message :
> 
> 116:*** target pattern contails no '%'. Stop.
> 
> Line 116 is 
> $(PCCSRC): $$(@:%.c=%.pc) $(INCLUDES)
> 
> In case I replace this by actual variable it works fine e.g.
> $(PCCSRC): $(PCSRC) $(INCLUDES)
> 
> Other patterns like $(@:%.c=%.pc) are working fine. Problem is whereever $$ 
> is 
> being used. 

Using $$@ etc. in prerequisite lists is a special feature of Solaris
make; it's not a standard feature of make in general.  Your makefile is
not portable to systems other than Solaris if it uses this feature.

> Am I missing some variable decalaration or its the problem with gcc or Linux? 

In GNU make you can enable "secondary expansion" which is a similar
feature, by adding the pseudo-target ".SECONDEXPANSION:" to your
makefile (anywhere before you try to use this feature):

        .SECONDEXPANSION:

Note you need a new-enough version of GNU make to support this; you
don't say what version you have.