In the previous post we looked how to interop with C. Now let’s look at how we create project and link our C library.
Generating a project #
c3c init myproject
Linking mylib #
Copy the static C library we created in the previous post to a directory of your choosing. I’ll put it in the lib directory of our project for now.
cp path-to/libmylib.a ./lib
You should now have the following project structure.
├── LICENSE
├── README.md
├── docs
├── lib
│ └── libmylib.a
├── project.json
├── resources
├── scripts
├── src
│ └── main.c3
└── test
Add the linked-libraries and linker-search-paths lines.
{
"langrev": "1",
"warnings": [ "no-unused" ],
"dependency-search-paths": [ "lib" ],
"dependencies": [ ],
"authors": [ "John Doe <john.doe@example.com>" ],
"version": "0.1.0",
"sources": [ "src/**" ],
"test-sources": [ "test/**" ],
"output": "build",
"targets": {
"myproject": {
"type": "executable",
},
},
"cpu": "generic",
"opt": "O0",
"linked-libraries": [ "mylib" ],
"linker-search-paths": [ "lib" ]
}
Declarations #
The main source file will look just like it did in the previous post
import std;
struct Point
{
int x;
int y;
}
extern fn void point_add(Point* a, Point* b, Point* dest);
fn int main()
{
Point a = { 1, 1 };
Point b = { 1, 2 };
Point c = {};
point_add(&a, &b, &c);
io::printfn("x: %d, y: %d", c.x, c.y);
return 0;
}
Compiling #
c3c build
./build/myproject
Alternatively you can use c3c run.