Add CMake example

rust-to-cmake/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "rust-to-cmake"
+version = "0.1.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+build = "build.rs"
+
+[dependencies]
+libc = "0.2"
+
+[build-dependencies]
+cmake = "0.1.41"

rust-to-cmake/build.rs

@@ -0,0 +1,11 @@
+extern crate cmake;
+
+fn main() {
+    // Builds the project in the directory located in `libfoo`, installing it
+    // into $OUT_DIR
+    let dst = cmake::build("libdouble");
+
+    println!("cargo:rustc-link-search=native={}", dst.display());
+    println!("cargo:rustc-link-lib=static=double");
+}
+

rust-to-cmake/libdouble/CMakeLists.txt

@@ -0,0 +1,7 @@
+add_library (
+    double 
+    STATIC
+    double.c
+)
+
+install (TARGETS double DESTINATION .)

rust-to-cmake/libdouble/double.c

@@ -0,0 +1,3 @@
+int double_input(int input) {
+    return input * 2;
+}

rust-to-cmake/src/main.rs

@@ -0,0 +1,11 @@
+extern crate libc;
+
+extern {
+    fn double_input(input: libc::c_int) -> libc::c_int;
+}
+
+fn main() {
+    let input = 4;
+    let output = unsafe { double_input(input) };
+    println!("{} * 2 = {}", input, output);
+}