strtoumax: fix typo in previous commit.

[gnulib.git] / m4 / isinf.m4

diff --git a/m4/isinf.m4 b/m4/isinf.m4
index 570dd23..513a1ba 100644 (file)
--- a/m4/isinf.m4
+++ b/m4/isinf.m4
@@ -1,5 +1,5 @@
-# isinf.m4 serial 8
-dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
+# isinf.m4 serial 9
+dnl Copyright (C) 2007-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,7 +9,12 @@ AC_DEFUN([gl_ISINF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   dnl Persuade glibc <math.h> to declare isinf.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_CHECK_DECLS([isinf], , , [[#include <math.h>]])
+  AC_CHECK_DECLS([isinf], , ,
+    [[#include <math.h>
+      #ifndef isinf
+      #error "isinf must be a macro, not a function"
+      #endif
+    ]])
   if test "$ac_cv_have_decl_isinf" = yes; then
     gl_CHECK_MATH_LIB([ISINF_LIBM], [x = isinf (x) + isinf ((float) x);])
     if test "$ISINF_LIBM" != missing; then