Work around a MacOS X 10.5 bug in frexpl().

[pspp] / ChangeLog

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+2008-01-15  Bruno Haible  <bruno@clisp.org>
+
+       Work around a MacOS X 10.5 bug in frexpl().
+       * m4/frexpl.m4 (gl_FUNC_FREXPL_WORKS): Also check denormalized numbers.
+       * doc/functions/frexpl.texi: Document the bug.
+       Reported by Elias Pipping <pipping@gentoo.org>.
+
 2008-01-14  Eric Blake  <ebb9@byu.net>
 
        Touch up previous patch.