deprecate lookup closures

[bpt/guile.git] / m4 / vasnprintf.m4

diff --git a/m4/vasnprintf.m4 b/m4/vasnprintf.m4
index 32ea985..61fe499 100644 (file)
--- a/m4/vasnprintf.m4
+++ b/m4/vasnprintf.m4
@@ -1,5 +1,5 @@
-# vasnprintf.m4 serial 32
-dnl Copyright (C) 2002-2004, 2006-2011 Free Software Foundation, Inc.
+# vasnprintf.m4 serial 34
+dnl Copyright (C) 2002-2004, 2006-2012 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.
@@ -63,7 +63,10 @@ AC_DEFUN_ONCE([gl_PREREQ_VASNPRINTF],
   AC_CHECK_FUNCS([snprintf strnlen wcslen wcsnlen mbrtowc wcrtomb])
   dnl Use the _snprintf function only if it is declared (because on NetBSD it
   dnl is defined as a weak alias of snprintf; we prefer to use the latter).
-  AC_CHECK_DECLS([_snprintf], , , [#include <stdio.h>])
+  AC_CHECK_DECLS([_snprintf], , , [[#include <stdio.h>]])
+  dnl Knowing DBL_EXPBIT0_WORD and DBL_EXPBIT0_BIT enables an optimization
+  dnl in the code for NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_DOUBLE.
+  AC_REQUIRE([gl_DOUBLE_EXPONENT_LOCATION])
   dnl We can avoid a lot of code by assuming that snprintf's return value
   dnl conforms to ISO C99. So check that.
   AC_REQUIRE([gl_SNPRINTF_RETVAL_C99])