RFR 8234362: k_standard.c is not needed and should be removed (was: Re: _IEEE_LIBM targets and __kernel_standard)

[Florian Weimer]

* Florian Weimer:

> __kernel_standard in src/java.base/share/native/libfdlibm/k_standard.c
> is built for _IEEE_LIBM targets as well, but it appears superfluous
> there.
>
> In noticed this because GCC 10 flags an uninitialized variable in this
> code:
>
> …/src/java.base/share/native/libfdlibm/k_standard.c: In function '__j__kernel_standard':
> …/src/java.base/share/native/libfdlibm/k_standard.c:743:19: error: 'exc.retval' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>   743 |         return exc.retval;
>       |                ~~~^~~~~~~
>
> Rather than debating whether this warning is reasonableor not, I would
> suggest to #ifdef out this code for _IEEE_LIBM targets (are there any
> else left?).

I think the file should just be removed.

Bug: <https://bugs.openjdk.java.net/browse/JDK-8234362>
Webrev: <http://cr.openjdk.java.net/~fweimer/8234362/webrev.01/>

As usual, I'll need a sponsor for this.

Thanks,
Florian