From 79272f68f2cbd2b29c5e606a721fed0028a180c3 Mon Sep 17 00:00:00 2001
From: vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4>
Date: Tue, 25 Aug 2015 15:17:22 +0000
Subject: [acinclude.m4] Check whether the 'j' printf length modifier is
 working.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@9659 280ebfd0-de03-0410-8827-d642c229c3f4
---
 acinclude.m4 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/acinclude.m4 b/acinclude.m4
index 8653e9cce..91131273a 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -164,6 +164,25 @@ if test "$ac_cv_type_intmax_t" = yes; then
   if test "$mpfr_cv_have_intmax_max" = "yes"; then
     AC_DEFINE(MPFR_HAVE_INTMAX_MAX,1,[Define if you have a working INTMAX_MAX.])
   fi
+  AC_CACHE_CHECK([for working 'j' printf length modifier],
+                 mpfr_cv_have_printf_j, [
+    saved_CPPFLAGS="$CPPFLAGS"
+    CPPFLAGS="$CPPFLAGS -I$srcdir/src"
+    AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <string.h>
+#include "mpfr-intmax.h"
+]],[[
+  char s[64];
+  sprintf (s, "%jd %ju", (intmax_t) -17, (uintmax_t) 42);
+  return strcmp (s, "-17 42") != 0;
+]])],
+      mpfr_cv_have_printf_j=yes, mpfr_cv_have_printf_j=no)
+    CPPFLAGS="$saved_CPPFLAGS"
+  ])
+  if test "$mpfr_cv_have_printf_j" = "yes"; then
+    AC_DEFINE(MPFR_HAVE_PRINTF_J,1,
+              [Define if you have a working 'j' printf length modifier])
+  fi
 fi
 
 AC_CHECK_TYPE( [union fpc_csr],
-- 
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