Re: please set both MALLOC_PERTURB_ and MALLOC_CHECK_ envvars

[Chong Yidong <cyd@stupidchicken.com>]

Jim Meyering <jim@meyering.net> writes:

>> If you develop emacs, or even if you just build from sources regularly,
>> on a glibc-based system, do us all a favor and build with these envvar
>> settings:
>>
>>     export MALLOC_PERTURB_=$((RANDOM % 255 + 1))
>>     export MALLOC_CHECK_=3
>>
>> Why?  Because that helps you expose malloc-related problems far earlier.
>> I've found numerous bugs that way.
>
> Most of that argument is valid, but I have to confess this time
> a compiler problem appears to be at fault.
> [...]
>     gcc version 4.7.0 20110528 (experimental) (GCC)
>
> everything works fine, and yes!, even with these envvar settings:
>
>     MALLOC_PERTURB_=117
>     MALLOC_CHECK_=3
>
> So at least for a little while, I'll be using that.

Maybe we should add these environment variables to the Hydra build.  But
what to use for MALLOC_PERTURB---117, or the value in your previous
message?