[perl #36896] autouse + DProf == segmentation fault

On Sat Aug 13 16:21:21 2005, at@altlinux.ru wrote:
> This is a bug report for perl from at@altlinux.org,
> generated with the help of perlbug 1.35 running under perl v5.8.7.
> 
> 
> $ perl -e 'use autouse qw(Pod::Usage pod2usage); pod2usage'
> Can't open -e for reading: No such file or directory
>  at -e line 1
> $ perl -d:DProf -e 'use autouse qw(Pod::Usage pod2usage); pod2usage'
> Can't open -e for reading: No such file or directory
>  at -e line 1
> zsh: segmentation fault (core dumped)
> $
> 

Running your code on Darwin on Perl 5.14.2, I got the failure messages
but no segmentation fault.

###
[perl] 518 $ perl -e 'use autouse qw(Pod::Usage pod2usage); pod2usage'
Can't open -e: No such file or directory at -e line 1
[perl] 519 $ perl -d:DProf -e 'use autouse qw(Pod::Usage pod2usage);
pod2usage'
Can't open -e: No such file or directory at -e line 1
###

But I should note that (a) Devel::DProf is deprecated -- see its
documentation in Perl 5.14 -- so we're not fixing bugs in connection
with it; and (b) even if we were still supporting DProf, I would be
skeptical about it playing well with 'autouse'.  After all, autouse's
documentation includes these warnings:

###
Using "autouse" will move important steps of your program's execution
from compile time to runtime.  This can

o   Break the execution of your program if the module you "autouse"d
has some initialization which it expects to be done early.

o   hide bugs in your code since important checks (like correctness of
prototypes) is moved from compile time to runtime.
...
###

I wouldn't expect any profiler to play well with this.

Thank you very much.
Jim Keenan

• [perl #36896] autouse + DProf == segmentation fault by James E Keenan via RT