opencl-sys 0.3.1

// Copyright (c) 2022-2024 Via Technology Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// Add an `OpenCL` ICD library path to the rust library search path on Windows.
///
/// Searches for an `OpenCL` ICD library in `$(OPENCL_PATH)lib` or
/// `$(OPENCL_ROOT)x64` / `$(OPENCL_ROOT)x64` before searching for
/// Intel, AMD and Nvidia `OpenCL` vendor SDK environment variables.
fn main() {
    if cfg!(windows) {
        let known_sdk = [
            // E.g. "C:\Program Files (x86)\Common Files\Intel\Shared Libraries\lib\"
            ("OPENCL_PATH", "", ""),
            // E.g. "$OPENCL_ROOT\lib\x64\"
            ("OPENCL_ROOT", "x64", "x86"),
            // E.g. "C:\Intel\OpenCL\sdk\lib\x64\"
            ("INTELOCLSDKROOT", "x64", "x86"),
            // E.g. "C:\Program Files (x86)\AMD APP SDK\3.0\lib\x86_64\"
            ("AMDAPPSDKROOT", "x86_64", "x86"),
            // E.g. "c:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\lib\Win32\"
            ("CUDA_PATH", "x64", "Win32"),
        ];

        for info in &known_sdk {
            if let Ok(sdk) = std::env::var(info.0) {
                let mut path = std::path::PathBuf::from(sdk);
                path.push("lib");
                if cfg!(target_arch = "x86_64") {
                    if !info.1.is_empty() {
                        path.push(info.1);
                    }
                } else if !info.2.is_empty() {
                    path.push(info.2);
                }
                println!("cargo:rustc-link-search=native={}", path.display());
                break;
            }
        }
    }
}