Fix static builds (#36)

Author: emrakyz

Cargo.toml

@@ -9,12 +9,12 @@ license = "MIT"
 
 [dependencies]
 ffms2-sys = { path = "./ffms2-sys" }
-cfg-if = "1.0"
-paste = "1.0"
-ffmpeg-the-third = "4.0"
+cfg-if = "1.0.4"
+paste = "1.0.15"
+ffmpeg-the-third = "4.0.1"
 
 [dev-dependencies]
-structopt = "0.3"
+structopt = "0.3.26"
 
 [workspace]
 members = ["ffms2-sys"]

ffms2-sys/Cargo.toml

@@ -7,9 +7,12 @@ repository = "https://github.com/rust-av/ffms2-rs"
 edition = "2021"
 license = "MIT"
 
+[features]
+static = []
+
 [build-dependencies]
-bindgen = "0.66"
-metadeps = "1.1"
+bindgen = "0.72.1"
+metadeps = "1.1.2"
 
 [package.metadata.pkg-config]
 ffms2 = "2.40"

ffms2-sys/build.rs

@@ -17,6 +17,8 @@ fn format_write(builder: bindgen::Builder) -> String {
 }
 
 fn main() {
+    let use_static = env::var("CARGO_FEATURE_STATIC").is_ok();
+
     // Consider 'FFMS_INCLUDE_DIR' and 'FFMS_LIB_DIR', if pkg-config should not be used.
     let headers = env::var("FFMS_INCLUDE_DIR").map(|value| {
         // Ensure the include directory is valid
@@ -35,9 +37,10 @@ fn main() {
 
         // Using dynamic library in Windows remains a problem. We have to copy the DLL into a path...
         // Problem: If 'FFMS_LIB_DIR' is outside of 'target', it is not considered (https://doc.rust-lang.org/cargo/reference/environment-variables.html).
-        #[cfg(windows)] {
+        // Only handle DLL copying for dynamic linking on Windows
+        #[cfg(windows)]
+        if !use_static {
             let cargo_output_dir = env::var("OUT_DIR").expect("Unable to get OUT_DIR");
-            // We need to add the file in target/{debug|release as it is included in the PATH: https://doc.rust-lang.org/cargo/reference/environment-variables.html#dynamic-library-paths
             let linkable_dll: PathBuf = [cargo_output_dir.as_ref(), "..", "..", "..", "ffms2.dll"].iter().collect();
 
             // Copy the file if it does not exists
@@ -52,7 +55,11 @@ fn main() {
         }
 
         // Add the flags for cargo otherwise explicitely added by pkg-config-rs
-        println!("cargo:rustc-link-lib=dylib=ffms2");
+        if use_static {
+            println!("cargo:rustc-link-lib=static=ffms2");
+        } else {
+            println!("cargo:rustc-link-lib=dylib=ffms2");
+        }
         println!("cargo:rustc-link-search=native={}", lib_dir.to_string_lossy());
 
         vec![include_dir]