Bug#752354: perl: trivial test C program fails to compile

[Damyan Ivanov]

-=| Niko Tyni, 22.06.2014 23:50:56 +0300 |=-
> Package: perl
> Version: 5.20.0-1
> Severity: important
> User: debian-perl at lists.debian.org
> Usertags: perl-5.20-transition
> 
> This is a regression from 5.18 and makes xchat-gnome drop
> its libperl linkage because its autoconf probe fails.
> 
>   % cat perltest.c 
>   #include <XSUB.h>
>   #include <EXTERN.h>
>   #include <perl.h>
>   int main() { return 0; }
>   % gcc $(perl -MExtUtils::Embed -e ccopts) perltest.c
>   /tmp/ccN3C0Sz.o: In function `S_croak_memory_wrap':
>   perltest.c:(.text+0x5): undefined reference to `PL_memory_wrap'
>   perltest.c:(.text+0x14): undefined reference to `Perl_croak_nocontext'
>   collect2: error: ld returned 1 exit status

I see this too. The compilation succeeds with 5.18.

> The severity should arguably be 'serious'.

Perhaps. But I think the fix is not in perl but in xchat-gnome.

It seems PL_memory_wrap and Perl_croak_nocontext were moved to libperl 
in 5.20, so the test library needs to link with that. Adding
 $(perl -MExtUtils::Embed -e ldopts)
to the compiler flags makes it pass. And xchat-gnome configuration 
looks like this:

 checking for perl... /usr/bin/perl
 checking for Perl header files... found
 checking for Perl library... found
 …
 checking for perl... /usr/bin/perl
 checking for perl >= 5.8.1... 5.20.0
 checking for XML::Parser... ok
 …
 checking which plugins to build...  autoaway notification url_scraper 
 sound-notification net-monitor notify-osd perl python tcl
 …
 config.status: creating plugins/perl/Makefile

Attached is the patch to xchat-gnome.

Not yet reassigning to allow a sanity check on my conclusions :)

Cheers,
    dam

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