in reply to Re: Make Perl use real malloc
in thread Make Perl use real malloc

It used to be that the FreeBSD port of Valgrind couldn't work with the system Perl, but that was because the FreeBSD system Perl was built with -Dusemymalloc, which Valgrind can't handle. I don't know of a similar problem with any system Perl in a Linux distro, nor have I seen any problems with a system Perl on OS X. Valgrind works with Perl on all those systems. It also works with Perl on FreeBSD if you custom compile your own Perl without -Dusemymalloc.

The only Configure prompts I know of relating to malloc() control PERL_MALLOC_WRAP and usemymalloc:

Do you wish to wrap malloc calls to protect against potential overflow +s? [y] n Do you wish to attempt to use the malloc that comes with perl5? [n]

If we want to work with Valgrind, we definitely don't want to enable usemymalloc (which is disabled by default).

The Accflags="-DNO_FANCY_MALLOC -DPLAIN_MALLOC " Configure flag worked as intended -- thanks for the tip! Unfortunately, it did not produce a Perl that allowed us to use Valgrind in place of Test::LeakTrace.

Maybe what we want is impossible because of how the global destruction phase works in Perl. If we use a debugging Perl and set PERL_DESTRUCT_LEVEL to 2, Perl will clean up all scalars, regardless of their refcounts. If we don't set PERL_DESTRUCT_LEVEL, it drops everything on the floor and lets the process exit() clean things up. There's no middle ground where it leaves only scalars with leaked refcounts behind.