Command: Generate Runtime System Files

Function: The command generates a C stub file and an M4 interface file from the current library project. These files are used as the basis for creating an external library file.

Call: Build menu

Requirement: A library project is open.

The command opens the Generate Files for Runtime System dialog.

Output directory	Directory where CODESYS creates the runtime system files Click the button to open the default dialog for browsing the file system.
Component name	Name of the library project
Which files do you want to create?
M4 interface file	: Interface file `<project name>Itf.m4` with definitions See also the table below with the IEC code constructs supported for M4 export. Example of M4 file:
C stub file	: Stub file for the reprogramming the library in C Example of stub file:
Options
Export referenced types included in libraries	: The referenced types are included in the export.
Use original type names	: The type names from the library project are used.

IEC constructs which are supported for M4 export

Important

All types which are not explicitly listed in the table are not supported. Their behavior can change unnoticed.

IEC construct and language means	Export to M4 file	Note
`PROGRAM`	Not supported
`FUNCTION_BLOCK`	`struct` with all input/output/inoutput/local variables In addition, a method named `<fb_name>__main` is created for the implementation of the `FUNCTION_BLOCK`.
`FUNCTION`	`STRUCT` with all input/output/inoutput/local variables and a `DEF_API` macro
`INTERFACE`	`struct` with a single instance pointer

`METHOD`	Same as `FUNCTION`, named `<fb_name>__<method_name>`, which uses the pointer to `<fb_name>` as an additional input
`ACTION`	Same as `METHOD`
`TRANSITION`	Same as `METHOD`, named `get<transition_name>`
`PROPERTY`	Method pair named `get<prop_name>` and `set<prop_name>`

`GVL`	Not supported

`UNION`	`C-union`
`ENUM`	`#define` for each enumeration component
`ALIAS`	Not supported
`STRUCT`	`C-struct`	Inheritance is supported. The components are exported "flat" (without structure)

`CONSTANT`	`#define` for each constant	Constants cannot be exported explicitly, but if they are used in the other objects, then they are automatically exported.

Comments	C comment	Comments with three slashes are also exported.

Predefined data types (INT, BOOL, REAL, etc.)	Corresponding C data type of the same size
Types beginning with `RTS_IEC`	Are not exported separately because they are declared elsewhere in the runtime system
`ANY` types	`struct __SYSTEM.AnyType`	All `ANY` types (for example, `ANY_INT`, `ANY_BIT`, etc.) are exported to the C type `struct __SYSTEM.AnyType`.
Arrays	C array with fixed size	Any number of dimensions Array areas can be negative.
`ARRAY[*]`	One pointer and one size
Strings	C array of characters with fixed size