[Bug libfortran/79956] [7 Regression] many new -Wmaybe-uninitialized warnings with bootstrap-O3

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79956

--- Comment #12 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Markus Trippelsdorf from comment #10)

> libgfortran/intrinsics/reshape_generic.c:253:21: warning: ‘sstride[0]’ may
> be used uninitialized in this function [-Wmaybe-uninitialized]

This one is probably due to

  for (n = 0; n < sdim; n++)
    {
      scount[n] = 0;
      sstride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
...

and later

  sstride0 = sstride[0] * size;

We know that sdim is at least one, but apparently the compiler does not.