---
sidebar_label: Library project
---

# Library Project

Creating a static library and using it in another project.

## Step 1: Create the library

```bash
dcr new my-lib
cd my-lib
```

`dcr.toml`:
```toml
[package]
name = "my-lib"
version = "0.1.0"
type = "none"

[build]
language = "c"
standard = "c11"
kind = "staticlib"
```

`src/my_lib.h`:
```c
#ifndef MY_LIB_H
#define MY_LIB_H
int add(int a, int b);
#endif
```

`src/my_lib.c`:
```c
#include "my_lib.h"
int add(int a, int b) { return a + b; }
```

## Step 2: Build

```bash
dcr build --release
```

Artifacts:
- `target/<triple>/release/libmy-lib.a` (Linux)
- `target/release/my-lib.lib` (Windows)
- `target/include/` — header files

## Step 3: Use in another project

```bash
dcr new my-app
cd my-app
dcr add my-lib ../my-lib
```

Automatically:
- Adds include path to `target/include/` of the library
- Adds lib path to `target/<triple>/release/`
- Links `libmy-lib.a` / `my-lib.lib`