Re: BUILT_SOURCES: dependencies not copied to build_dir

[Ralf Wildenhues]

Hi Michael,

* Michael Biebl wrote on Tue, Mar 28, 2006 at 12:16:18PM CEST:
> This is the solution I came up with:
> 
> EXTRA_DIST = ngcs_marshal.ngci idef.py ngcs.py
> CLEANFILES = ngcs_marshal.h ngcs_marshal.c
> 
> ngcs_marshal.c: ngcs_marshal.ngci idef.py
>         $(srcdir)/idef.py $(srcdir)/ngcs_marshal @

Do you mean `$@' instead of `@' here?  If not: what is the `@' supposed
to do?

> ngcs_marshal.h: ngcs_marshal.ngci idef.py
>         $(srcdir)/idef.py $(srcdir)/ngcs_marshal @
> 
> This way idef.py and ngcs_marshal.ngci are not copied to the builddir
> and whenever they change one of them in the srcdir the header and c file
> are regenerated.
> I don't need srcdir in the dependency line, but if I omit them in the
> build rule I either get:
[errors]

Well, yes, you do need it in the rule.  Were they inference rules, could
you use `$<', but in an explicit rule like above that is not portable.

> I also had to change idef.py to take an additional parameter (@) where I
> can tell the location of the output file. Otherwise the file is created
> in the srcdir. I wanted to avoid changing idef.py first (that's why the
> copying) but it seemed not to be possible.

That's definitely the better way.

Cheers,
Ralf