An example to demonstrate how to organize files for writing a library in the C language using Modern CMake.
.
|-- CMakeLists.txt
|-- LICENSE
|-- Readme.md
`-- libprg
|-- CMakeLists.txt
`-- src
|-- include
| `-- libprg
| `-- libprg.h
`-- libprg
|-- libprg.c
|-- sub.c
`-- sum.cCMake FetchContent can download this library directly from his GitHub repository and you must indicate from which branch or tag. In this example I will use the main branch or the 0.0.1 tag.
Create a new project (C executable) using CMake and your CMakeLists.txt file should look like this:
cmake_minimum_required(VERSION 3.21)
project(myapp C)
set(CMAKE_C_STANDARD 17)
include(FetchContent)
FetchContent_Declare(
libprg
GIT_REPOSITORY https://github.com/emersonmello/libprg.git
GIT_TAG origin/main
# or GIT_TAG 0.0.1
# You can reference a local directory instead
# URL file:///${CMAKE_CURRENT_SOURCE_DIR}/../libprg
)
FetchContent_MakeAvailable(libprg)
add_executable(myapp main.c)
# linking libprg
target_link_libraries(myapp PUBLIC libprg)And your main.c should look like this:
#include <stdio.h>
#include <libprg/libprg.h>
int main(void) {
int a = 1, b = 2;
result_t r = compute(a, b, SUM);
printf("%d + %d = %8.2f", a, b, r.value);
return 0;
}