From 9bc5ecf3bcb25abbf868d52e7db076248e0ef174 Mon Sep 17 00:00:00 2001
From: Andreas Schwab <schwab@suse.de>
Date: Tue, 13 Feb 2018 11:21:01 +0000
Subject: [PATCH] RISC-V: define _REENTRANT with -pthread

This is expected by the AX_PTHREAD autoconf macro from
<http://www.gnu.org/software/autoconf-archive/ax_pthread.html>.

	* config/riscv/linux.h (CPP_SPEC): Define.

From-SVN: r257621
---
 gcc/ChangeLog            | 4 ++++
 gcc/config/riscv/linux.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6ed2b5ca39e..1bb2af7f240 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2018-02-13  Andreas Schwab  <schwab@suse.de>
+
+	* config/riscv/linux.h (CPP_SPEC): Define.
+
 2018-02-13  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/84335
diff --git a/gcc/config/riscv/linux.h b/gcc/config/riscv/linux.h
index 1da1b0a74ea..ad03654e8d6 100644
--- a/gcc/config/riscv/linux.h
+++ b/gcc/config/riscv/linux.h
@@ -47,6 +47,8 @@ along with GCC; see the file COPYING3.  If not see
 
 #define ICACHE_FLUSH_FUNC "__riscv_flush_icache"
 
+#define CPP_SPEC "%{pthread:-D_REENTRANT}"
+
 #define LINK_SPEC "\
 -melf" XLEN_SPEC "lriscv \
 %{shared} \
-- 
2.30.2