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Errors when compiling Control Unit

When launching make :

ghdl -a control_unit.vhdl
control_unit.vhdl:43:37: no declaration for "size"
control_unit.vhdl:44:37: no declaration for "size"
control_unit.vhdl:45:37: no declaration for "size"
control_unit.vhdl:46:37: no declaration for "size"
control_unit.vhdl:50:39: no declaration for "size"
control_unit.vhdl:51:39: no declaration for "size"
control_unit.vhdl:52:37: no declaration for "size"
control_unit.vhdl:58:22: no declaration for "b"
control_unit.vhdl:59:12: no declaration for "size"
control_unit.vhdl:59:8: signal name must be static
control_unit.vhdl:63:48: no declaration for "size"
control_unit.vhdl:63:63: no declaration for "a"
control_unit.vhdl:63:66: no declaration for "b"
control_unit.vhdl:64:48: no declaration for "size"
control_unit.vhdl:64:63: no declaration for "a"
control_unit.vhdl:65:48: no declaration for "size"
control_unit.vhdl:67:45: no declaration for "size"
control_unit.vhdl:67:60: no declaration for "a"
control_unit.vhdl:71:36: no declaration for "sel"
control_unit.vhdl:75:21: no declaration for "sel"
ghdl: compilation error
make: *** [control_unit] Erreur 1

One problem is that SIZE is defined in the components but not in this entity, and you try to use it anyway.
Again, A, B, O and SEL aren't defined anywhere.

Another problem is that SEL_ALU and SEL_MUX are defined as inputs when they must be outputs...

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