bootstrap CMake

inspired by https://medium.com/@au42/the-useful-raspberrypi-cross-compile-guide-ea56054de187

CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.0)
+
+# Have CMake find our pthreads library within our toolchain (required for this library)
+set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
+find_package(Threads REQUIRED)
+
+# add all the *.c files as sources
+FILE(GLOB SRC_FILES ${PROJECT_SOURCE_DIR}/wiringPiD/*.c
+                    ${PROJECT_SOURCE_DIR}/wiringPi/*.{c,h}
+)
+
+# make this output a shared library (with .so output)
+add_library (wiringPi SHARED ${SRC_FILES})
+
+# be sure to include the current source directory for header files
+target_include_directories (wiringPi PUBLIC ${PROJECT_SOURCE_DIR}/wiringPi
+)
+
+# add the following required libraries:
+# Threads, Math, Crypt, and RealTime
+target_link_libraries(wiringPi ${CMAKE_THREAD_LIBS_INIT} crypt m rt)

rpi.cmake

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+# Define our host system
+SET(CMAKE_SYSTEM_NAME Linux)
+SET(CMAKE_SYSTEM_VERSION 1)
+
+# Define the cross compiler location inside edi
+SET(CMAKE_C_COMPILER /usr/bin/arm-linux-gnueabihf-gcc)
+SET(CMAKE_CXX_COMPILER /usr/bin/arm-linux-gnueabihf-gcc)
+
+# Define edi sysroot 
+SET(CMAKE_FIND_ROOT_PATH /)
+
+# Use our definitions for compiler tools
+SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+# Search for libraries and headers in the target directories only
+SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+add_definitions(-Wall)