[PATCH] user: Add v5 to v6 migration help
Sebastian Huber
sebastian.huber at embedded-brains.de
Tue Jul 7 13:05:21 UTC 2020
---
user/migration/index.rst | 1 +
user/migration/v5-to-v6.rst | 20 ++++++++++++++++++++
2 files changed, 21 insertions(+)
create mode 100644 user/migration/v5-to-v6.rst
diff --git a/user/migration/index.rst b/user/migration/index.rst
index 76012b5..06af484 100644
--- a/user/migration/index.rst
+++ b/user/migration/index.rst
@@ -15,3 +15,4 @@ from one version of RTEMS to a new version.
.. toctree::
v4_11-to-v5
+ v5-to-v6
diff --git a/user/migration/v5-to-v6.rst b/user/migration/v5-to-v6.rst
new file mode 100644
index 0000000..5997057
--- /dev/null
+++ b/user/migration/v5-to-v6.rst
@@ -0,0 +1,20 @@
+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
+
+.. _Migration_5_to_6:
+
+RTEMS 5 to RTEMS 6
+==================
+
+This section provides helpful information when migrating from RTEMS 5 to
+RTEMS 6.
+
+Update to GCC 10
+----------------
+
+The tool suite for RTEMS 6 uses GCC 10. GCC 10 enables ``-fno-common`` by
+default. Code bases which never used this option before may observe now
+multiple definition linker errors. For example, if global variables are
+declared and defined in header files (usually a missing ``extern`` in the header
+file).
--
2.26.2
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