X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Fvasnprintf.m4;h=2d4b46310b437d1035fd7d678507c4de12e31ac2;hb=547f1057e84f61003a0db4049df3f90725187f0b;hp=3a1d1e01006402ffd34994d1abe1642e243bc43f;hpb=c7e61475680fa226bd9b8bdd469cd66914e630f5;p=debian%2Fgzip

diff --git a/m4/vasnprintf.m4 b/m4/vasnprintf.m4
index 3a1d1e0..2d4b463 100644
--- a/m4/vasnprintf.m4
+++ b/m4/vasnprintf.m4
@@ -1,5 +1,5 @@
-# vasnprintf.m4 serial 29
-dnl Copyright (C) 2002-2004, 2006-2009 Free Software Foundation, Inc.
+# vasnprintf.m4 serial 36
+dnl Copyright (C) 2002-2004, 2006-2016 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.
@@ -29,7 +29,7 @@ AC_DEFUN([gl_REPLACE_VASNPRINTF],
   gl_PREREQ_ASNPRINTF
 ])
 
-# Prequisites of lib/printf-args.h, lib/printf-args.c.
+# Prerequisites of lib/printf-args.h, lib/printf-args.c.
 AC_DEFUN([gl_PREREQ_PRINTF_ARGS],
 [
   AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
@@ -37,9 +37,10 @@ AC_DEFUN([gl_PREREQ_PRINTF_ARGS],
   AC_REQUIRE([gt_TYPE_WINT_T])
 ])
 
-# Prequisites of lib/printf-parse.h, lib/printf-parse.c.
+# Prerequisites of lib/printf-parse.h, lib/printf-parse.c.
 AC_DEFUN([gl_PREREQ_PRINTF_PARSE],
 [
+  AC_REQUIRE([gl_FEATURES_H])
   AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
   AC_REQUIRE([gt_TYPE_WCHAR_T])
   AC_REQUIRE([gt_TYPE_WINT_T])
@@ -61,7 +62,21 @@ 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])
+  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'