Add support for searching Vulkan SDK library path

README.md

@@ -86,12 +86,14 @@ attempts to obtain native shaderc can be controlled by several options, which
 are passed through to shaderc-sys when building shaderc-rs:
 
 1. Building from source, if option `--features build-from-source` is specified.
-2. If the `SHADERC_LIB_DIR` environment variable is set to
+1. If the `SHADERC_LIB_DIR` environment variable is set to
    `/path/to/shaderc/libs/`, that path will be searched for native dynamic or
    static shaderc library.
-3. On Linux, system library paths like `/usr/lib/` will additionally be searched
+1. If the `VULKAN_SDK` environment variable is set, then `$VULKAN_SDK/lib` will
+   be searched for native dynamicd or static shaderc library.
+1. On Linux, system library paths like `/usr/lib/` will additionally be searched
    for native dynamic or shaderc library, if the `SHADERC_LIB_DIR` is not set.
-4. Building from source, if the native shaderc library is not found via the
+1. Building from source, if the native shaderc library is not found via the
    above steps.
 
 For each library directory, the build script will try to fine and link to the

shaderc-sys/build/build.rs

@@ -140,6 +140,19 @@ fn main() {
         None
     };
 
+    // Try to find native shaderc library from Vulkan SDK if possible.
+    if search_dir.is_none() {
+        search_dir = if let Ok(sdk_dir) = env::var("VULKAN_SDK") {
+            println!(
+                "cargo:warning=shaderc: searching native shaderc libraries in Vulkan SDK '{}/lib'",
+                sdk_dir
+            );
+            Some(format!("{}/lib/", sdk_dir))
+        } else {
+            None
+        };
+    }
+
     // If no explicit path is set and no explicit request is made to build from
     // source, check known system locations before falling back to build from source.
     // This set `search_dir` for later usage.