[Bug fortran/91497] -Wconversion warns when doing explicit type conversion

[sgk at troutmask dot apl.washington.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91497

--- Comment #10 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Wed, Sep 11, 2019 at 02:25:23PM +0000, manfred99 at gmx dot ch wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91497
> 
> --- Comment #9 from Manfred Schwarb <manfred99 at gmx dot ch> ---
> Hi Steve,
> 
> I tried your patch in comment 4, it is a good starting point.
> However, SNGL and DBLE still throw warnings:

A patch similar to what appears in comment #4 need to 
be applied to gfc_simplify_dble and gfc_simplify_sngl.

>       !---unknown but documented type conversions:
>       !!aa=FLOATI(e)
>       !!aa=FLOATJ(f)
>       !!aa=FLOATK(g)

The above are under the -fdec option.

>       !---LONG not allowed anymore in gfortran 10 (?):
>       !!ff=LONG(a)
>       !!ff=LONG(b)
>       !!ff=LONG(c)
>       !!ff=LONG(d)
>       !!ff=LONG(g)

LONG was removed by by BOZ patch.  It was documented
to convert its argument to C's 32-bit long type.  Not
a good thing as long can be 64-bit.  Note, SHORT was
also removed.  Fortunately, LONG and SHORT were in-line
conversion, so no change to libgfortran was needed.