[PATCH] MIPS: Use `.set arch=mips2' to emulate LL/SC for the R5900 too

[Fredrik Noring]

`.set arch=' was implemented in Binutils by Thiemo Seufer 29 June 2003 in
commit fef14a42892a297bf, and the GNU C Library requires Binutils 2.25,
from 2014, or later, so it ought to be compatible as used here.

This change has been tested by compiling the GNU C Library 2.27 with a
GCC 8.2.0 cross-compiler for mipsr5900el-unknown-linux-gnu under Gentoo.
---
 sysdeps/mips/sys/tas.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/mips/sys/tas.h b/sysdeps/mips/sys/tas.h
index 3e020a754e..40057f9d16 100644
--- a/sysdeps/mips/sys/tas.h
+++ b/sysdeps/mips/sys/tas.h
@@ -41,8 +41,8 @@ __NTH (_test_and_set (int *__p, int __v))
   __asm__ __volatile__
     ("/* Inline test and set */\n"
      ".set	push\n\t"
-#if _MIPS_SIM == _ABIO32 && __mips < 2
-     ".set	mips2\n\t"
+#if _MIPS_SIM == _ABIO32 && (__mips < 2 || defined(_MIPS_ARCH_R5900))
+     ".set	arch=mips2\n\t"
 #endif
      "sync\n\t"
      "1:\n\t"
-- 
2.18.1