Bug#827319: vim: FTBFS[alpha,kfreebsd-*]: Test_tagcase() failed

[Niko Tyni]

On Sat, Oct 15, 2016 at 02:14:21PM -0400, James McCoy wrote:
> On Sat, Oct 15, 2016 at 01:40:43PM -0400, James McCoy wrote:

> > Lo and behold, configuring without --enable-perlinterp but adding
> > "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" to PERL_CFLAGS in
> > src/auto/config.mk reproduces the issue.
> > 
> > Which begs the question, why does configure think the defines aren't
> > necessary?
> 
> And why does Perl's build think they are necessary, advertising them as
> required to build against Perl?

I believe the immediate reason is that the PerlInterpreter struct in
perl.h / intrpvar.h has 'stat struct' members in it (aliased as Stat_t.)

This is the main interface for embedding Perl (see perlembed(1)), so
building without _FILE_OFFSET_BITS=64 results in binary incompatibility
with perl/libperl on 32-bit platforms.  We've seen plenty of related
crashes and the like with applications ignoring Perl's ccflags.

Not sure about _LARGEFILE_SOURCE; I always thought the two just need
to go together.
-- 
Niko Tyni   ntyni at debian.org