[FEATURE] Command line selection of app to compile

[vcrocher]

Allow to pass the statemachine folder to compile as a command line option instead of selecting (commenting in/out) the relevant line in the CMakeFileLists.txt.

Pros

• No change required to any file to switch statemachine (also easier for PR)
• Allow possible bulk compilation/testing of several SM
• IDE/programmatic choice of SM to compile

Cons

• Longer cmake command line

Possible Implementation

A typical build command would be rm -r build && mkdir build && cd build && cmake -DAPP:string=src/apps/M2DemoMachine ..

And the new CMakeFileLists.txt would look like this:

cmake_minimum_required(VERSION 3.3)
project(CORC C CXX)

#Invoke by specifying application path to build. e.g.
# cmake -DAPP:string=src/apps/ExoTestMachine ..
#or
# cmake -DAPP:string=src/apps/M2DemoMachine ..
#or
# cmake -DAPP:string=../myStateMachineApp .. for an external statemachine folder

#To cross-compile for Arm (BeagleBone) use the armhf toolchain:
# cmake -DAPP:string=src/apps/M3DemoMachine -DCMAKE_TOOLCHAIN_FILE=../armhf.cmake ..
# For aarch64 (e.g. Jetson):
# cmake -DAPP:string=src/apps/M3DemoMachine -DCMAKE_TOOLCHAIN_FILE=../aarch64.cmake ..

################################## USER FLAGS ##################################

## Comment to use actual hardware, uncomment for a nor robot (virtual) app
set(NO_ROBOT ON)

## Select desired logging level (Options: TRACE, DEBUG, INFO, WARN, ERROR, CRITICAL, OFF)
## INFO is the recommended level in normal operation
set(CORC_LOGGING_LEVEL DEBUG)

################################################################################

## Select the application by setting the state machine app.cmake to use
SET(${APP} "src/apps/ExoTestMachine" CACHE STRING "Realtive app state machine app to build") #Default to ExoTestMachine if not provided

include(${APP}/app.cmake)

message("-----------------------------------------------\nCompiling state machine ${APP} with platform ${PLATFORM}\n-----------------------------------------------")

## CORC internal cmake logic
include(corc.cmake)