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test-float fails on powerpc

From: Santiago Vila
Subject: test-float fails on powerpc
Date: Sun, 29 Apr 2012 14:24:41 +0200 (CEST)
User-agent: Alpine 2.02 (DEB 1266 2009-07-14)


I implicitly enabled gnulib tests in the Debian diffutils package
(by switching debian/rules to debhelper) and now the package fails to
build from source on the powerpc architecture because test-float fails:

test-float.c:333: assertion failed

This is the relevant code:

 /* Check the value of LDBL_MAX.  */
    volatile long double m = LDBL_MAX;
    int n;

    ASSERT (m + m > m);
    for (n = 0; n <= 2 * LDBL_MANT_DIG; n++)
        volatile long double pow2_n = pow2l (n); /* 2^n */
        volatile long double x = m + (m / pow2_n);
        if (x > m)
          ASSERT (x + x == x);   /* <==== This is the line which fails */
          ASSERT (!(x + x == x));

In the meantime, I will disable this test in the Debian package.


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