Program invocation

tcc invokes the external program with a keyword indicating the desired operation, followed by more arguments specific to the operation, and optional user arguments.

The following operations are possible:

config

obtain general configuration parameters for the external target.

probe

verify whether the requested configuration can be supported by the external target.

build

generate all components necessary to implement the configuration. If possible, the external program should not implement parts of the configuration during the build run, i.e. if the external program needs to configure a hardware accelerator, it should generate the kernel modules needed to set up the hardware, and not manipulate the hardware by itself.

The program must have the name tcc-ext-external_target, and tcc must be able to find it in the PATH.

User arguments are passed on the tcc or tcsim command line with the -X option for phase x, see sections 5.1.1 and 5.1.2.