From c8c3c7af87804a175b3dfc60dce191b03c9741fe Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Fri, 19 Jun 2020 15:45:52 +0000
Subject: Use [[maybe_unused]] instead of YS_ATTRIBUTE(unused).

[[maybe_unused]] is available since C++17, so this commit adds
a polyfill YS_MAYBE_UNUSED. Once we require C++17 we can drop it.
---
 kernel/yosys.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'kernel')

diff --git a/kernel/yosys.h b/kernel/yosys.h
index b9b6b24b1..f1646d6bc 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -144,6 +144,14 @@ extern Tcl_Obj *Tcl_ObjSetVar2(Tcl_Interp *interp, Tcl_Obj *part1Ptr, Tcl_Obj *p
 #  define YS_ATTRIBUTE(...)
 #endif
 
+#if __cplusplus >= 201703L
+#  define YS_MAYBE_UNUSED [[maybe_unused]];
+#elif defined(__GNUC__) || defined(__clang__)
+#  define YS_MAYBE_UNUSED __attribute__((__unused__))
+#else
+#  define YS_MAYBE_UNUSED
+#endif
+
 #if __cplusplus >= 201703L
 #  define YS_FALLTHROUGH [[fallthrough]];
 #elif defined(__clang__)
-- 
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