Differences between "make test" and "prove" (was Re: TAP - Test::More - fork)

On 2011.11.10 7:15 AM, H.Merijn Brand wrote:
> Yes, there indeed is a core
>
> (gdb) where
> #0  0xc000000000258c70:0 in free+0x1d0 () from /usr/lib/hpux64/libc.so.1
> #1  0x400000000017f7e0:0 in Perl_safesysfree () at util.c:262
> #2  0x40000000000d0ab0:0 in perl_destruct () at perl.c:871
> #3  0x400000000009a740:0 in main () at perlmain.c:119
>
> I however do not understand why prove seems to be safe, but make test
> is not

First, try to replicate everything "make test" is doing with prove.

For starters, even though test processes are supposed to remain separate, 
other tests could be interfering and the segfault only happens when you run 
the whole test suite.  So run the whole test suite.

     prove -wbr t

I see you're firing off child processes, if you're doing the same in the 
previous test it could be that they're not finished from the previous test 
starts.  It could be that your database is in a bad state.

The second major difference is "make test" sets the PERL_DL_NONLAZY flag which 
is helpful for XS testing, so add that into the mix.

     PERL_DL_NONLAZY=1 prove -wbr t

If that doesn't work, go the other way.  Strip out everything you can, 
including prove, and start adding things in.  When you want verbose test 
output, don't use prove -v, just run the program.

     perl -w -Mblib t/21-uni-regex.t

If that doesn't replicate, try adding in subtle things which are different 
between 'make test', 'prove' and running manually.

Try having STDOUT go to a pipe instead of a TTY.

     perl -w -Mblib t/21-uni-regex.t | cat

Try the same for input.

     echo | perl -w -Mblib t/21-uni-regex.t

Try both.

     echo | perl -w -Mblib t/21-uni-regex.t | cat

Or it could be that prove is setting environment variables which Test::Harness 
is not, check them.  They could be affecting your shell command.


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