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Diffstat (limited to 'user/migration/v5-to-v6.rst')
| -rw-r--r-- | user/migration/v5-to-v6.rst | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/user/migration/v5-to-v6.rst b/user/migration/v5-to-v6.rst index d4691ff..98c7366 100644 --- a/user/migration/v5-to-v6.rst +++ b/user/migration/v5-to-v6.rst @@ -1,6 +1,6 @@ .. SPDX-License-Identifier: CC-BY-SA-4.0 -.. Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de) +.. Copyright (C) 2020 embedded brains GmbH & Co. KG .. _Migration_5_to_6: @@ -10,14 +10,28 @@ RTEMS 5 to RTEMS 6 This section provides helpful information when migrating from RTEMS 5 to RTEMS 6. -Update to GCC 10 ----------------- +Update to GCC 10 and Later +-------------------------- -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). +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 ----------------------------- |