Re: Not rebuilding existing files

Lars Ivar Igesund wrote:

> I've created a custom action that creates import libraries
> from dlls.
> 
> It looks like this:
> 
> :action implib lib dll
>      :sys implib /noi /system $target $source
> 
> and the route
> 
> :route dll lib
>      implib
> 
> I call it by using
> 
> :do implib {target = $lib} $dll
> 
> Now, if I execute the recipe again, the import libraries are rebuilt
> unnecessarily. It seems like I'm unable to find out how to not rebuild
> if they already exists. Is there an easy way to add this to the code
> above? I don't think this  stuff warrants an inclusion into A-A-P and
> thus I want to make as small a recipe for it as possible.

An action is always executed when you invoke it with ":do".

You probably want to use a rule or dependency for this:

	:rule %.lib : %.dll
		:do implib {target = $target} $source
	
And then use ":update my.lib" where you were using ":do implib".

You don't need the route for this.  There is still a design decision to
be taken whether routes should also be used like rules, to execute
commands to update a target.  Problem is that the relation between the
target and source file name may not be so obvious and we only know the
file types.

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