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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 and Later
--------------------------
The tool suite for RTEMS 6 uses at least GCC 10. GCC 10 and later enable
``-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).
No -specs bsp_specs GCC Option
------------------------------
The ``-spec bsp_specs`` GCC Option is no longer needed to build RTEMS
applications and there is no :file:`bsp_specs` file installed. If you use this
option, then you get an error like this:
.. code-block:: none
sparc-rtems6-gcc: fatal error: cannot read spec file 'bsp_specs': No such file or directory
You can remove this GCC option from your build to fix this error.
Alternatively, you can add an empty :file:`bsp_specs` file.
Replacements for Removed APIs
-----------------------------
* The ``rtems_iterate_over_all_threads()`` directive was removed. Use
``rtems_task_iterate()`` instead.
* The ``rtems_get_current_processor()`` directive was removed. Use
``rtems_scheduler_get_processor()`` instead.
* The ``rtems_get_processor_count()`` directive was removed. Use
``rtems_scheduler_get_processor_maximum()`` instead.
* The ``boolean`` type was removed. Use ``bool`` instead.
* The ``single_precision`` type was removed. Use ``float`` instead.
* The ``double_precision`` type was removed. Use ``double`` instead.
* The ``proc_ptr`` type was removed. Use a proper function pointer type.
* The ``rtems_context`` type was removed. If you need this type in your
applications, please ask on the :r:list:`devel`.
* The ``rtems_context_fp`` type was removed. If you need this type in your
applications, please ask on the :r:list:`devel`.
* The ``rtems_extension`` type was removed. Use ``void`` instead.
* The ``rtems_io_lookup_name()`` directive was removed. Use ``stat()`` instead.
* The ``region_information_block`` type was removed. Use
``Heap_Information_block`` instead.
* The ``rtems_thread_cpu_usage_t`` type was removed. Use ``struct timespec``
instead.
* The ``rtems_rate_monotonic_period_time_t`` type was removed. Use ``struct
timespec`` instead.
* The ``_Copyright_Notice`` constant was removed from the API. Use
``rtems_get_copyright_notice()`` instead.
* The ``_RTEMS_version`` constant was removed from the API. Use
``rtems_get_version_string()`` instead.
* The ``RTEMS_MAXIMUM_NAME_LENGTH`` define was removed. Use
``sizeof( rtems_name )`` instead.
* The ``<rtems/system.h>`` header file was removed. Include ``<rtems.h>``
instead.
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