From 7cb7c9c102d652c1c99c9bb29f2bf8f28d3d51ba Mon Sep 17 00:00:00 2001
From: Dominick Schroer <dominick@schroer.ca>
Date: Sun, 28 May 2023 12:31:01 -0600
Subject: [PATCH] Add dynamic linking support for faster builds

---
 crates/opencascade-sys/Cargo.toml  |  3 +
 crates/opencascade-sys/build.rs    | 97 ++++++++++++++++++------------
 crates/opencascade-sys/src/main.rs |  6 ++
 3 files changed, 68 insertions(+), 38 deletions(-)
 create mode 100644 crates/opencascade-sys/src/main.rs

diff --git a/crates/opencascade-sys/Cargo.toml b/crates/opencascade-sys/Cargo.toml
index 9434c8fd..caeea2f1 100644
--- a/crates/opencascade-sys/Cargo.toml
+++ b/crates/opencascade-sys/Cargo.toml
@@ -46,6 +46,9 @@ exclude = [
     "OCCT/tools/*",
 ]
 
+[features]
+dynamic = []
+
 [dependencies]
 cxx = "1"
 
diff --git a/crates/opencascade-sys/build.rs b/crates/opencascade-sys/build.rs
index 430b353a..caa8d878 100644
--- a/crates/opencascade-sys/build.rs
+++ b/crates/opencascade-sys/build.rs
@@ -1,44 +1,29 @@
+const LIBS: [&'static str; 18] = [
+    "TKMath",
+    "TKMath",
+    "TKernel",
+    "TKGeomBase",
+    "TKG2d",
+    "TKG3d",
+    "TKTopAlgo",
+    "TKGeomAlgo",
+    "TKGeomBase",
+    "TKBRep",
+    "TKPrim",
+    "TKSTL",
+    "TKMesh",
+    "TKShHealing",
+    "TKFillet",
+    "TKBool",
+    "TKBO",
+    "TKOffset",
+];
+
 fn main() {
     let target = std::env::var("TARGET").expect("No TARGET environment variable defined");
     let is_windows = target.to_lowercase().contains("windows");
     let is_windows_gnu = target.to_lowercase().contains("windows-gnu");
-
-    let dst = cmake::Config::new("OCCT")
-        .define("BUILD_LIBRARY_TYPE", "Static")
-        .define("BUILD_MODULE_Draw", "FALSE")
-        .define("USE_OPENGL", "FALSE")
-        .define("USE_GLES2", "FALSE")
-        .define("USE_D3D", "FALSE")
-        .define("USE_VTK", "FALSE")
-        .define("USE_TCL", "FALSE")
-        .define("USE_XLIB", "FALSE")
-        .define("USE_FREETYPE", "FALSE")
-        .define("USE_FREEIMAGE", "FALSE")
-        .define("USE_OPENVR", "FALSE")
-        .define("USE_FFMPEG", "FALSE")
-        .define("INSTALL_DIR_LIB", "lib")
-        .define("INSTALL_DIR_INCLUDE", "include")
-        .build();
-
-    println!("cargo:rustc-link-search=native={}", dst.join("lib").display());
-    println!("cargo:rustc-link-lib=static=TKMath");
-    println!("cargo:rustc-link-lib=static=TKernel");
-    println!("cargo:rustc-link-lib=static=TKFeat");
-    println!("cargo:rustc-link-lib=static=TKGeomBase");
-    println!("cargo:rustc-link-lib=static=TKG2d");
-    println!("cargo:rustc-link-lib=static=TKG3d");
-    println!("cargo:rustc-link-lib=static=TKTopAlgo");
-    println!("cargo:rustc-link-lib=static=TKGeomAlgo");
-    println!("cargo:rustc-link-lib=static=TKGeomBase");
-    println!("cargo:rustc-link-lib=static=TKBRep");
-    println!("cargo:rustc-link-lib=static=TKPrim");
-    println!("cargo:rustc-link-lib=static=TKSTL");
-    println!("cargo:rustc-link-lib=static=TKMesh");
-    println!("cargo:rustc-link-lib=static=TKShHealing");
-    println!("cargo:rustc-link-lib=static=TKFillet");
-    println!("cargo:rustc-link-lib=static=TKBool");
-    println!("cargo:rustc-link-lib=static=TKBO");
-    println!("cargo:rustc-link-lib=static=TKOffset");
+    let is_dynamic = std::env::var("CARGO_FEATURE_DYNAMIC").is_ok();
 
     if is_windows {
         println!("cargo:rustc-link-lib=dylib=user32");
@@ -50,11 +35,24 @@ fn main() {
         build.define("OCC_CONVERT_SIGNALS", "TRUE");
     }
 
+    if !is_dynamic {
+        let opencascade_include = build_opencascade();
+        build.include(opencascade_include);
+
+        for lib in LIBS {
+            println!("cargo:rustc-link-lib=static={lib}");
+        }
+    } else {
+        for lib in LIBS {
+            println!("cargo:rustc-link-lib=dylib={lib}");
+        }
+        build.include("/usr/include/opencascade");
+    }
+
     build
         .cpp(true)
         .flag_if_supported("-std=c++11")
         .define("_USE_MATH_DEFINES", "TRUE")
-        .include(format!("{}", dst.join("include").display()))
         .include("include")
         .compile("wrapper");
 
@@ -63,3 +61,26 @@ fn main() {
     println!("cargo:rerun-if-changed=src/lib.rs");
     println!("cargo:rerun-if-changed=include/wrapper.hxx");
 }
+
+fn build_opencascade() -> String {
+    let dst = cmake::Config::new("OCCT")
+        .define("BUILD_LIBRARY_TYPE", "Static")
+        .define("BUILD_MODULE_Draw", "FALSE")
+        .define("USE_OPENGL", "FALSE")
+        .define("USE_GLES2", "FALSE")
+        .define("USE_D3D", "FALSE")
+        .define("USE_VTK", "FALSE")
+        .define("USE_TCL", "FALSE")
+        .define("USE_XLIB", "FALSE")
+        .define("USE_FREETYPE", "FALSE")
+        .define("USE_FREEIMAGE", "FALSE")
+        .define("USE_OPENVR", "FALSE")
+        .define("USE_FFMPEG", "FALSE")
+        .define("INSTALL_DIR_LIB", "lib")
+        .define("INSTALL_DIR_INCLUDE", "include")
+        .build();
+
+    println!("cargo:rustc-link-search=native={}", dst.join("lib").display());
+
+    format!("{}", dst.join("include").display())
+}
diff --git a/crates/opencascade-sys/src/main.rs b/crates/opencascade-sys/src/main.rs
new file mode 100644
index 00000000..a8b20852
--- /dev/null
+++ b/crates/opencascade-sys/src/main.rs
@@ -0,0 +1,6 @@
+use opencascade_sys::ffi::new_point;
+
+fn main() {
+    let point = new_point(0.0, 0.0, 0.0);
+    println!("x: {}, y: {}, z: {}", point.X(), point.Y(), point.Z());
+}
\ No newline at end of file