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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/26566] nptl/tst-thread-exit-clobber fails on
 powerpc/powerpc64 with GCC 10.2
Date: Wed, 08 May 2024 09:58:48 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26566

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com

--- Comment #6 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Manjunath S Matti from comment #5)
> I have some more info here:
>=20
> I have run make check on both x86 and PPC64le, this particular testcase is
> marked as
> UNSUPPORTED: nptl/tst-thread-exit-clobber

I think this happens because it's a C++ tested, and you either do not have a
g++ installed, or libstdc++-static is missing (yes, we should probably fixed
that, and not disable all C++ tests if C++ static linking is unsupported).

> Also this testcase compares 2 doubles is this ok ?
>=20
> 106 __attribute__ ((noinline, noclone, weak))
> 107 void
> 108 check_magic (int index, double value)
> 109 {
> 110   switch (index)
> 111     {
> 112     case 0:
> 113       TEST_VERIFY (value =3D=3D magic_values_double.v0); -> here
> 114       break;

Are you asking because of a general rule that says not to compare floating
point numbers for equality? In this case, we want to make sure that the test
case preserves the bit pattern exactly.

--=20
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