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Diffstat (limited to 'doc/using/InvokingGHDL.rst')
| -rw-r--r-- | doc/using/InvokingGHDL.rst | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/doc/using/InvokingGHDL.rst b/doc/using/InvokingGHDL.rst index a2099152c..6846b1b3e 100644 --- a/doc/using/InvokingGHDL.rst +++ b/doc/using/InvokingGHDL.rst @@ -284,6 +284,18 @@ Options Specify the standard to use. By default, the standard is ``93c``, which means VHDL-93 accepting VHDL-87 syntax. For details on ``STANDARD`` values see section :ref:`VHDL_standards`. +.. option:: -fsynopsys + + Allow the use of synopsys non-standard packages + (``std_logic_arith``, ``std_logic_signed``, ``std_logic_unsigned``, + ``std_logic_textio``). These packages are + present in the ieee library but without this option it's an error to + use them. + + The synopsys packages were created by some companies, and are popular. However + they are not standard packages, and have been placed in the `IEEE` + library without the permission from the ``ieee``. + .. option:: --ieee=<IEEE_VAR> .. index:: ieee library @@ -307,13 +319,8 @@ Options for more details. synopsys - Supply the former packages and the following additional packages: - ``std_logic_arith``, ``std_logic_signed``, - ``std_logic_unsigned``, ``std_logic_textio``. - - These packages were created by some companies, and are popular. However - they are not standard packages, and have been placed in the `IEEE` - library without the permission from the ``ieee``. + This option is now deprecated. It is equivalent to + ``--ieee=standard`` and ``-fsynopsys``. To avoid errors, you must use the same `IEEE` library for all units of your design, and during elaboration. |