Check whether round* exist in libraries, not just whether they are declared.

[gnulib.git] / ChangeLog

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+2007-10-27  Ben Pfaff  <blp@gnu.org>
+
+       Ralf Wildenhues reported that Tru64 4.0D declares the round
+       functions but does not have definitions.
+       * m4/check-math-lib.m4 (gl_CHECK_MATH_LIB): If the target function
+       cannot be found in any library, set the output variable to
+       "missing" instead of "".
+       * m4/round.m4: Also use our substitute if we cannot find round in
+       any library, even if it is declared.
+       * m4/roundf.m4: Likewise for roundf.
+       * m4/roundl.m4: Likewise for roundl.
+       * lib/math.in.h: Undefine roundf, round, roundl before defining
+       their replacements, to allow for hypothetical systems where these
+       may be defined as macros but not available in libraries.
+
 2007-10-27  Bruno Haible  <bruno@clisp.org>
 
        * doc/gnulib.texi: Invoke @firstparagraphindent.