[Bug libfortran/81939] valgrind error message in build_float_string and heap-buffer-overflow on address sanitized libgfortran.so

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81939

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Did you get MALLOC checks?
>
> *** Error in `./a.out': free(): invalid pointer: 0x0000000000c0b560 ***
> *** Error in `./a.out': free(): invalid pointer: 0x0000000000c0b6a0 ***
> *** Error in `./a.out': free(): invalid pointer: 0x0000000000c0c9f0 ***
>
> I have MALLOC_CHECK_=1

I am not sure MALLOC_CHECK_ is doing anything on darwin and I cannot use
valgrind anymore.