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.. 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).
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