Re: free-posix: New module, renamed from 'free'

[Paul Eggert]

On 12/19/20 1:28 PM, Bruno Haible wrote:
> when you write
>
>      int saved_errno = errno;
>      free (ptr);
>      errno = saved_errno;
>
> GCC may transform this to just
>
>      free (ptr);
>
> Reported at<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98396>  .

Ouch. Yet another reason 'free' should preserve errno. The GCC problem also 
seems to affect malloc.

Luckily GCC does not seem to do these incorrect transformations to Gnulib's 
current code (in particular, to lib/free.c) at least not on my platform (gcc 
10.2.0-13ubuntu, x86-64). Don't know why, but thank goodness for small favors.