cmake: compile a shared library and executable - c

Question

I would like to build:
A shared library
An executable using the compiled shared library in point 1.
For the library, I have the following CMakeLists.txt file:
cmake_minimum_required(VERSION 3.13.4)
project(driver C)
set(CMAKE_C_STANDARD 99)
set(LIB_PATH "../../libdriver")
include_directories(${LIB_PATH})
include_directories(driver ${LIB_PATH}/uart)
add_library(driver SHARED
${LIB_PATH}/libdriver.c
${LIB_PATH}/uart/uart.c)
I create the LIB_PATH variable, because the files needed for the lib compilation are outside of the tree.
Now I have my executable CMakeLists.txt and I would like to use the compiled previously dll file.
cmake_minimum_required(VERSION 3.13.4)
project(proj_exe C)
set(CMAKE_C_STANDARD 99)
set(LIB_PATH "../../libdriver") # so I have the headers
set(MAIN_PATH "../../project") # the main.c file located here
include_directories(${LIB_PATH})
include_directories(driver ${LIB_PATH}/uart)
# what to do now to compile the executable with the dll

Answer 1

You'll probably want to install the driver libs locally and use cmake's functionality to generate a import script. In the project using the lib, you can use find_package to add the dll as imported target allowing you to link it using target_link_library:
add_library(driver SHARED
${LIB_PATH}/libdriver.c
${LIB_PATH}/uart/uart.c)
# attach the info to the target here
target_include_directories(driver PUBLIC
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${LIB_PATH}>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${LIB_PATH}/uart>
$<INSTALL_INTERFACE:include>
$<INSTALL_INTERFACE:include/uart>
)
install(TARGETS driver EXPORT driver
RUNTIME DESTINATION bin
ARCHIVE DESTINATION lib
LIBRARY DESTINATION lib
)
# usually there's a lib just containing the public headers
# that can be copied, but yours seems to contain the source files too;
# not enough info though to separate headers from sources though, so we'll just copy everything
install(DIRECTORY ${LIB_PATH}/ DESTINATION include)
install(EXPORT base DESTINATION cmake FILE base-config.cmake)
After building you should be able to do
cmake --install build_dir --prefix install_path
This allows you use find_package to import the files from the install directory, assuming you've added it to the CMAKE_PREFIX_PATH
cmake -D CMAKE_PREFIX_PATH=install_path -S ... -B ...
find_package(driver REQUIRED CONFIG)
add_executable(foo ...)
target_link_libraries(foo PRIVATE driver)
You may need to adjust the paths in the description a bit to point use the correct locations relative to the current working directory...