isinf: Ensure macro on AIX 5.1.

* m4/isinf.m4 (gl_ISINF): Also test whether isinf is defined as a
macro.
* doc/posix-functions/isinf.texi: Mention also AIX 5.1 as deficient.

diff --git a/ChangeLog b/ChangeLog
index ef3cb53..362fdf4 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2011-10-09  Bruno Haible  <bruno@clisp.org>
 
+       isinf: Ensure macro on AIX 5.1.
+       * m4/isinf.m4 (gl_ISINF): Also test whether isinf is defined as a
+       macro.
+       * doc/posix-functions/isinf.texi: Mention also AIX 5.1 as deficient.
+
+2011-10-09  Bruno Haible  <bruno@clisp.org>
+
        *printf-posix tests: Fix for platforms where 'long double' == 'double'.
        * modules/snprintf-posix-tests (configure.ac): Require
        gl_LONG_DOUBLE_VS_DOUBLE.

diff --git a/doc/posix-functions/isinf.texi b/doc/posix-functions/isinf.texi
index 8ef4b4d..eea723b 100644 (file)
--- a/doc/posix-functions/isinf.texi
+++ b/doc/posix-functions/isinf.texi
@@ -10,7 +10,7 @@ Portability problems fixed by Gnulib:
 @itemize
 @item
 This macro is missing on some platforms:
-AIX 4.3.2, IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11.
+AIX 5.1, IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11.
 @item
 This macro incorrectly yields true for some @samp{long double} arguments, on
 some platforms:

diff --git a/m4/isinf.m4 b/m4/isinf.m4
index 570dd23..3e4b900 100644 (file)
--- a/m4/isinf.m4
+++ b/m4/isinf.m4
@@ -1,4 +1,4 @@
-# isinf.m4 serial 8
+# isinf.m4 serial 9
 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,
@@ -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