[PATCH v3] psxtests: Fix math function build warnings

[Gedare Bloom]

> diff --git a/testsuites/psxtests/psxhdrs/math/has_long_double.h b/testsuites/psxtests/psxhdrs/math/has_long_double.h
> new file mode 100644
> index 0000000000..4372142288
> --- /dev/null
> +++ b/testsuites/psxtests/psxhdrs/math/has_long_double.h
> @@ -0,0 +1,53 @@
> +/* SPDX-License-Identifier: BSD-2-Clause */
> +
> +/**
> + * @file
> + *
> + * @brief Defines NEWLIB_HAS_LONG_DOUBLE_MATH_FUNCTIONS
> + *
> + * This file uses logic copied from newlib's math.h on 21 Jan 2021
> + * to determine whether or not the long double math functions tests
> + * should be built. The original math.h file was sourced from
> + * https://codeload.github.com/RTEMS/sourceware-mirror-newlib-cygwin/tar.gz/a0d7982
> + */
> +
> +/*
> + * Copyright (C) 2021, 2021 Stephen Clark
> + *

I don't think that the copied portion has been modified substantially
that (a) allows to apply a different license than was used in the
upstream, and (b) allows to add a copyright here.

> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifndef HAS_LONG_DOUBLE_H
> +#define HAS_LONG_DOUBLE_H
> +
> +/* Newlib doesn't fully support long double math functions so far.
> +   On platforms where long double equals double the long double functions
> +   simply call the double functions.  On Cygwin the long double functions
> +   are implemented independently from newlib to be able to use optimized
> +   assembler functions despite using the Microsoft x86_64 ABI. */
> +#if defined (_LDBL_EQ_DBL) || defined (__CYGWIN__)
> +#ifndef __math_68881
> +#define NEWLIB_HAS_LONG_DOUBLE_MATH_FUNCTIONS 1
> +#endif
> +#endif
> +
> +#endif