From 1f8a5265f637d6fd1554c7ca7d6fe8261d21c1de Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rn-Michael=20Miehe?= <miehe@dp-electronics.de>
Date: Thu, 15 Aug 2019 16:52:52 +0200
Subject: [PATCH] Add CMake example

---
 rust-to-cmake/Cargo.toml               | 11 +++++++++++
 rust-to-cmake/build.rs                 | 11 +++++++++++
 rust-to-cmake/libdouble/CMakeLists.txt |  7 +++++++
 rust-to-cmake/libdouble/double.c       |  3 +++
 rust-to-cmake/src/main.rs              | 11 +++++++++++
 5 files changed, 43 insertions(+)
 create mode 100644 rust-to-cmake/Cargo.toml
 create mode 100644 rust-to-cmake/build.rs
 create mode 100644 rust-to-cmake/libdouble/CMakeLists.txt
 create mode 100644 rust-to-cmake/libdouble/double.c
 create mode 100644 rust-to-cmake/src/main.rs

diff --git a/rust-to-cmake/Cargo.toml b/rust-to-cmake/Cargo.toml
new file mode 100644
index 0000000..d1929a9
--- /dev/null
+++ b/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"
diff --git a/rust-to-cmake/build.rs b/rust-to-cmake/build.rs
new file mode 100644
index 0000000..8b1da15
--- /dev/null
+++ b/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");
+}
+
diff --git a/rust-to-cmake/libdouble/CMakeLists.txt b/rust-to-cmake/libdouble/CMakeLists.txt
new file mode 100644
index 0000000..20c98a8
--- /dev/null
+++ b/rust-to-cmake/libdouble/CMakeLists.txt
@@ -0,0 +1,7 @@
+add_library (
+    double 
+    STATIC
+    double.c
+)
+
+install (TARGETS double DESTINATION .)
\ No newline at end of file
diff --git a/rust-to-cmake/libdouble/double.c b/rust-to-cmake/libdouble/double.c
new file mode 100644
index 0000000..9fd3c60
--- /dev/null
+++ b/rust-to-cmake/libdouble/double.c
@@ -0,0 +1,3 @@
+int double_input(int input) {
+    return input * 2;
+}
diff --git a/rust-to-cmake/src/main.rs b/rust-to-cmake/src/main.rs
new file mode 100644
index 0000000..2104230
--- /dev/null
+++ b/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);
+}