Re: updating flex?

[Alistair Crooks <agc%pkgsrc.org@localhost>]

On Wed, May 21, 2008 at 05:18:36PM +0100, Patrick Welche wrote:
> cleanextra: .PHONY
> .if defined(CLEANFILES) && !empty(CLEANFILES)
>         rm -f ${CLEANFILES}
> .endif
> 
> but it doesn't seem that later CLEANFILES+=some flex files
> actually get added.

You're right - in normal use, i.e. "rm -f ${CLEANFILES}" above,
${CLEANFILES} gets expanded to the value it contains after all of the
Makefiles have been read and parsed.  However, when CLEANFILES is used
as part of a cpp-style '.if' statement, i.e. the

        .if defined(CLEANFILES) && !empty(CLEANFILES)

above, these are done in line, and so ${CLEANFILES} is evaluated there
and then.

Regards,
A previous victim of this

PS. Thanks for looking at flex, this is very useful.