Chris Marusich <cmmarusich@gmail.com> writes:

> [...] I've reported this issue upstream:
> https://github.com/libcheck/check/issues/333

Branden Archer replied in the above issue.  In short, the unreleased
upstream commit 4fbe702fa4f35bee8a90512f9f59d1441c4ae82e fixes this
issue on PPC platforms.  Here's what the commit does:

https://github.com/libcheck/check/commit/4fbe702fa4f35bee8a90512f9f59d1441c4ae82e.patch

  Adjust test suite for 106-bit long double precision

  On PowerPC architectures (ppc, ppc64el, powerp) 'long double' has a
  precision of 106-bit, compared to 80-bit precision on amd64.

  This leads to the test_ck_assert_(float|double|ldouble)_eq_tol succeed
  rather than fail as expected, cause 0.003-0.002 will be actually
  slightly bigger than 0.001 and not slightly smaller.

  Increase the change to the tolerance, so it will be on all architectures
  smaller than the difference of ~0.001 and the unit tests will fail as
  expected.

This commit was merged to the check repository's master branch after its
latest release (0.15.2).  It will be included in the next check release,
but until then, we will have to apply the fix as a patch to our check
package.  I've attached a patch that does this.

-- 
Chris