bug#54390: YACC rules don't check DESTDIR existence for VPATH builds

[Sam James]

> On 13 Jan 2023, at 08:43, Mike Frysinger <vapier@gentoo.org> wrote:
> 
> On 13 Jan 2023 07:07, Sam James wrote:
>> $ /tmp/libaacs/configure YACC=bison LEX=flex
> 
> the problem is you're forcing `YACC=bison`.  Automake defaults to `bison -y`
> which tells bison to operate in POSIX-yacc-compatible mode because Automake's
> rules target POSIX.  the end result is that you've forced a non-POSIX mode,
> and bison is writing files to the cwd which is not what Automake expects.
> it isn't that the src/file/ directory doesn't exist -- you can see from your
> log that files have been generated in src/file/ before the failure.

thanks, duh. That makes sense.

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