From ff164b601b75a9aba47edfaa9a215cb376ab055e Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 24 Jun 2019 13:09:47 +0100
Subject: Define C11 macros such as FLT_DECIMAL_DIG for C++17

	* testsuite/18_support/headers/cfloat/values_c++17.cc: New test.

From-SVN: r272615
---
 gcc/ginclude/float.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'gcc/ginclude')

diff --git a/gcc/ginclude/float.h b/gcc/ginclude/float.h
index 9ebae05..4767d7b 100644
--- a/gcc/ginclude/float.h
+++ b/gcc/ginclude/float.h
@@ -210,7 +210,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #endif /* C99 */
 
-#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \
+     || (defined (__cplusplus) && __cplusplus >= 201703L)
 /* Versions of DECIMAL_DIG for each floating-point type.  */
 #undef FLT_DECIMAL_DIG
 #undef DBL_DECIMAL_DIG
-- 
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