isfinite, isinf: Fix link error on AIX 6 and 7.

[gnulib.git] / m4 / isinf.m4

diff --git a/m4/isinf.m4 b/m4/isinf.m4
index f6056e6..145e37e 100644 (file)
--- a/m4/isinf.m4
+++ b/m4/isinf.m4
@@ -1,4 +1,4 @@
-# isinf.m4 serial 4
+# isinf.m4 serial 5
 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -11,7 +11,7 @@ AC_DEFUN([gl_ISINF],
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   AC_CHECK_DECLS([isinf], , , [#include <math.h>])
   if test "$ac_cv_have_decl_isinf" = yes; then
-    gl_CHECK_MATH_LIB([ISINF_LIBM], [x = isinf (x);])
+    gl_CHECK_MATH_LIB([ISINF_LIBM], [x = isinf (x) + isinf ((float) x);])
     if test "$ISINF_LIBM" != missing; then
       dnl Test whether isinf() on 'long double' works.
       gl_ISINFL_WORKS