make compilation better

cmake/platform_Pico.cmake

@@ -0,0 +1,31 @@
+pico_sdk_init()
+
+target_compile_options(GeographicLib INTERFACE -fexceptions -frtti)
+
+add_executable(p-rad
+    src/main.cpp
+    ${CORE_SOURCES}
+    ${HAL_SOURCES}
+)
+
+target_compile_options(p-rad PRIVATE -ffunction-sections -fdata-sections)
+target_link_options(p-rad PRIVATE -Wl,--gc-sections)
+
+if(CMAKE_BUILD_TYPE EQUAL Release)
+    add_compile_options(-Os)
+endif()
+
+
+target_compile_definitions(p-rad PRIVATE PICO_BUILD)
+target_include_directories(p-rad PRIVATE src)
+target_link_libraries(p-rad
+    pico_stdlib
+    pico_cyw43_arch_lwip_threadsafe_background
+    hardware_rtc
+    GeographicLib
+)
+
+pico_enable_stdio_usb(p-rad 1)
+pico_enable_stdio_uart(p-rad 0)
+
+pico_add_extra_outputs(p-rad)