Integrate gs building code for MacOS systems (#552)

# Purpose
Previously, no instructions were provided on how to build the ground
station program for MacOS systems. This PR adds steps on how to fix the
errors that are encountered while building it.

# New Changes
- Instructions on building gs for MacOS systems were added to the readme

# Testing
Explain tests that you ran to verify code functionality.
- [x] I have unit-tested this PR. Otherwise, explain why it cannot be
unit-tested.
- [ ] I have tested this PR on a board if the code will run on a board
(Only required for firmware developers).
- [ ] I have tested this PR by running the ARO website (Only required if
the code will impact the ARO website).
- [ ] I have tested this PR by running the MCC website (Only required if
the code will impact the MCC website).
- [ ] I have included screenshots of the tests performed below.

# Outstanding Changes
If there are non-critical changes (i.e. additional features) that can be
made to this feature in the future, indicate them here.
- Currently, the instructions allow for successfully launching the cli.
More thorough testing may be required for full functionality

Author: c4bae

CMakeLists.txt

@@ -8,7 +8,9 @@ if(${CMAKE_BUILD_TYPE} MATCHES OBC)
     endif()
     set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/cmake/toolchain_arm_none_eabi.cmake)
 elseif(${CMAKE_BUILD_TYPE} MATCHES GS)
-    set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/cmake/toolchain_ground_station_gcc.cmake)
+    if(NOT APPLE)
+        set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/cmake/toolchain_ground_station_gcc.cmake)
+    endif()
 elseif(${CMAKE_BUILD_TYPE} MATCHES HIL)
     include(${CMAKE_SOURCE_DIR}/cmake/fetch_googletest.cmake)
     set(CMAKE_TOOLCHAIN_FILE ${CMAKE_SOURCE_DIR}/cmake/toolchain_hil_gcc.cmake)

gs/backend/CMakeLists.txt

@@ -14,6 +14,13 @@ target_include_directories(gs.out PUBLIC
 
 target_compile_options(gs.out PUBLIC -Wall -g)
 
+if(APPLE)
+    target_link_libraries(gs.out PUBLIC
+        "-framework CoreFoundation"
+        "-framework IOKit"
+    )
+endif()
+
 if(UNIX)
     target_link_libraries(gs.out PUBLIC
         tiny-aes

gs/backend/main.c

@@ -12,7 +12,11 @@
 #include <aes.h>
 #include <cserialport.h>
 
-#include <malloc.h>
+#ifdef __APPLE__
+#ifdef TARGET_OS_MAC
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+#endif
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>

interfaces/obc_gs_interface/__init__.py

@@ -1,6 +1,12 @@
 from ctypes import CDLL
 from pathlib import Path
+from sys import platform
+
+if platform == "darwin":
+    extension = "dylib"
+else:
+    extension = "so"
 
 # The shared object file we are using the access the c functions via ctypes
-path = (Path(__file__).parent / "../../build_gs/interfaces/libobc-gs-interface.so").resolve()
+path = (Path(__file__).parent / f"../../build_gs/interfaces/libobc-gs-interface.{extension}").resolve()
 interface = CDLL(str(path))

obc/CMakeLists.txt

@@ -1,5 +1,10 @@
 cmake_minimum_required(VERSION 3.15)
 
+if(APPLE)
+    find_library(COREFOUNDATION CoreFoundation)
+    find_library(IOKIT IOKit)
+endif()
+
 # Set default values for firmware build options
 include(${CMAKE_SOURCE_DIR}/cmake/obc_build_options.cmake)