diff --git a/gl/m4/vasnprintf.m4 b/gl/m4/vasnprintf.m4
index 50a20cca2346803576a53ad8e39d5950cc3fbc33..ebe3c52cde6f5b745f77da016e967642620d2fa0 100644 (file)
--- a/gl/m4/vasnprintf.m4
+++ b/gl/m4/vasnprintf.m4
-# vasnprintf.m4 serial 29
+# vasnprintf.m4 serial 31
dnl Copyright (C) 2002-2004, 2006-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
# Prerequisites of lib/vasnprintf.c.
AC_DEFUN_ONCE([gl_PREREQ_VASNPRINTF],
[
+ AC_REQUIRE([AC_C_INLINE])
AC_REQUIRE([AC_FUNC_ALLOCA])
AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
AC_REQUIRE([gt_TYPE_WCHAR_T])
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>])
+ 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])
+ case "$gl_cv_func_snprintf_retval_c99" in
+ *yes)
+ AC_DEFINE([HAVE_SNPRINTF_RETVAL_C99], [1],
+ [Define if the return value of the snprintf function is the number of
+ of bytes (excluding the terminating NUL) that would have been produced
+ if the buffer had been large enough.])
+ ;;
+ esac
])
# Extra prerequisites of lib/vasnprintf.c for supporting 'long double'