Pico_Template_C/libs/foo/CMakeLists.txt

# Set minimum required version of CMake
cmake_minimum_required(VERSION 3.12)

# Include build functions from Pico SDK
include($ENV{PICO_SDK_PATH}/external/pico_sdk_import.cmake)

# Creates a pico-sdk subdirectory in our project for the libraries
pico_sdk_init()

# Set name of project (as PROJECT_NAME) and C/C   standards
project(foo C CXX ASM)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)

# Add library information
add_library(${PROJECT_NAME}
    inc/foo.h
    src/foo.cpp
)

# Set local include directories
target_include_directories(${PROJECT_NAME} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/inc)

# Link to external lib pico_stdlib (gpio, time, etc. functions)
target_link_libraries(${PROJECT_NAME} 
    pico_stdlib
)