From: Stefano Rivera <stefanor@debian.org>
Date: Wed, 15 Jan 2020 09:56:01 +0000
Subject: That's the oldest version that Debian targets.

Forwarded: not-needed
---
 rpython/translator/platform/arch/s390x.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/rpython/translator/platform/arch/s390x.py b/rpython/translator/platform/arch/s390x.py
index a44af09..f80abf9 100644
--- a/rpython/translator/platform/arch/s390x.py
+++ b/rpython/translator/platform/arch/s390x.py
@@ -103,9 +103,7 @@ def update_cflags(cflags):
         if cflag.startswith('-march='):
             break
     else:
-        # the default cpu architecture is zEC12
-        # one can directly specifying -march=... if needed
-        revision = 'zEC12'
+        revision = 'z10'
         cflags += ('-march='+revision,)
     cflags += ('-m64','-mzarch')
     return cflags
