Re: AM_CONDITIONAL and config.status

[Roger Leigh]

On Sat, Feb 02, 2002 at 11:07:15AM -0700, Tom Tromey wrote:
> >>>>> "Roger" == Roger Leigh <address@hidden> writes:
> 
> Roger> in Makefile.in, is it safe to use this format in my own .in files (e.g.
> Roger> po/POTFILES.in), or will the format used for the conditionals in .in
> Roger> files change at a future date?  What I need to do is have lines
> Roger> conditionally included, as some are conditionally distributed.
> 
> Conditionals don't work they way you seem to think they do.
> The @FOO_TRUE@ is rewritten to either `' (empty string) or `#' (make
> comment) by configure.  No line is omitted from the generated Makefile.
> 
> My recommendation is not to rely on the implementation of
> conditionals.  It isn't something we have ever documented.  We might
> actually change it at some point; for instance we might be able to get
> better performance from config.status if we change how conditionals
> are implemented.

OK.  Back to the drawing board ;-)

I did actually get this working:

@address@hidden CUPS sources
@address@hidden/cups/genppd.c
@address@hidden Foomatic-related sources
@address@hidden/foomatic/printer_options.c
==>
# CUPS sources
src/cups/genppd.c
# Foomatic-related sources
src/foomatic/printer_options.c

When GIMP_SOURCE is true, the lines are nicely commented out with '#'.
I won't use this though ;-)

> Roger> if COND
> Roger> FOO
> Roger> BAR
> Roger> BAZ
> Roger> else
> Roger> BAD
> Roger> endif
> 
> I read this example but I don't understand how it differs from what we
> already do.  Right now you can enclose all kinds of stuff in a single
> conditional.  What you can't do is have a conditional that starts or
> ends in the middle of a rule or macro definition.

OK.  I though that in the past I could only have one line between
if-endif or if-else or else-endif.  That was quite some time ago though.
automake.info only gives examples which use a single line.

> Roger> Being able to use 'ifndef' would also be another nice addition,
> Roger> or has this already been done (I possibly remember this being
> Roger> mentioned).
> 
> You can use `if !FOO'.

Great.

Many thanks,
Roger

-- 
Roger Leigh
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