From b0332a97ab1abdddadbe34dc30ee2b8e7d5cb2f9 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Sun, 2 Aug 2020 10:11:00 -0700
Subject: [PATCH] libcxx: Define __NR_futex to be __NR_futex_time64 on riscv32

RISCV glibc has decided to use 64bit time_t from get go unlike
other 32bit architecture therefore aliasing __NR_futex to
__NR_futex_time64 helps avoid the below errors on rv32

Upstream-Status: Submittted [https://reviews.llvm.org/D85095]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 libcxx/src/atomic.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libcxx/src/atomic.cpp b/libcxx/src/atomic.cpp
index 65d4837bb4a7..e9969b8e570e 100644
--- a/libcxx/src/atomic.cpp
+++ b/libcxx/src/atomic.cpp
@@ -16,6 +16,9 @@
 #include <iostream>
 
 #ifdef __linux__
+#if !defined(__NR_futex) && defined(__riscv) && __riscv_xlen == 32
+# define __NR_futex __NR_futex_time64
+#endif
 
 #include <unistd.h>
 #include <linux/futex.h>
-- 
2.28.0