Many packages fail with "test-float-h.c:460: assertion 'x <= 1.0L' failed" on big-endian PowerPC

Hi,

I have observed that many packages such as gnutls28, libunstring and m4 fail their testsuites
on big-endian PowerPC, both 32-bit and 64-bit targets, with the following error when built
with GCC 15:

FAIL: test-float-h
==================

test-float-h.c:460: assertion 'x <= 1.0L' failed
FAIL test-float-h (exit status: 134)

Overriding the default compiler with "export CC=gcc-14" to GCC 14 fixes the problem.

Reported in [1] and [2].

Adrian

> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123788
> [2] https://github.com/linuxppc/issues/issues/494

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