From 251f3295b498b699aa2b926167a788a6b6dbc033 Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne.2@gmail.com>
Date: Wed, 3 Feb 2021 17:00:20 -0500
Subject: [PATCH] =?utf8?q?[=F0=9F=8D=92][libc++]=20Fix=20libcxx=20build=20?=
 =?utf8?q?on=2032bit=20architectures=20with=2064bit=20time=5Ft=20defaults?=
 =?utf8?q?=20e.g.=20riscv32?=
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Patch by Khem Raj.

(cherry pick of commit 85b9c5ccc172a1e61c7ecaaec4752587cb6f1e26)

Differential Revision: https://reviews.llvm.org/D96062
---
 libcxx/src/atomic.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libcxx/src/atomic.cpp b/libcxx/src/atomic.cpp
index 6b73ed771cd..9ae1fb5199b 100644
--- a/libcxx/src/atomic.cpp
+++ b/libcxx/src/atomic.cpp
@@ -19,6 +19,12 @@
 #include <linux/futex.h>
 #include <sys/syscall.h>
 
+// libc++ uses SYS_futex as a universal syscall name. However, on 32 bit architectures
+// with a 64 bit time_t, we need to specify SYS_futex_time64.
+#if !defined(SYS_futex) && defined(SYS_futex_time64)
+# define SYS_futex SYS_futex_time64
+#endif
+
 #else // <- Add other operating systems here
 
 // Baseline needs no new headers
-- 
2.11.0