Default build-many-glibcs.py to GCC 7 branch [committed]

[Joseph Myers]

Now there is a GCC 7 release branch, this patch makes
build-many-glibcs.py default to using it instead of GCC 6.

Relative to GCC 6, this fixes the MicroBlaze build but introduces ICEs
building glibc testcases for SH (GCC PRs 78459, 78460; the latter is
an out-of-memory issue so you may want to set memory limits when
running build-many-glibcs.py).

Committed.

2017-04-26  Joseph Myers  <joseph@codesourcery.com>

	* scripts/build-many-glibcs.py (Context.checkout): Default gcc
	version to 7 branch.

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index 388abc3..6f11a9c 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -683,7 +683,7 @@ class Context(object):
     def checkout(self, versions):
         """Check out the desired component versions."""
         default_versions = {'binutils': 'vcs-2.28',
-                            'gcc': 'vcs-6',
+                            'gcc': 'vcs-7',
                             'glibc': 'vcs-mainline',
                             'gmp': '6.1.1',
                             'linux': '4.10',

-- 
Joseph S. Myers
joseph@codesourcery.com