Add Cargo features for selecting installed CUDA version.

Use the features to gate on the API version and a (currently empty)
binding to the FP16 API.

Fix for stable rustc.

Author: peterhj

Cargo.toml

@@ -13,3 +13,24 @@ keywords      = ["GPGPU", "CUDA", "ffi"]
 license       = "MIT"
 readme        = "README.md"
 categories    = []
+
+[features]
+default       = ["cuda_8_0"]
+cuda_6_5      = []
+cuda_7_0      = ["gte_cuda_7_0"]
+cuda_7_5      = ["gte_cuda_7_0", "gte_cuda_7_5"]
+cuda_8_0      = ["gte_cuda_7_0", "gte_cuda_7_5", "gte_cuda_8_0"]
+cuda_9_0      = ["gte_cuda_7_0", "gte_cuda_7_5", "gte_cuda_8_0", "gte_cuda_9_0"]
+cuda_9_1      = ["gte_cuda_7_0", "gte_cuda_7_5", "gte_cuda_8_0", "gte_cuda_9_0", "gte_cuda_9_1"]
+cuda_9_2      = ["gte_cuda_7_0", "gte_cuda_7_5", "gte_cuda_8_0", "gte_cuda_9_0", "gte_cuda_9_1", "gte_cuda_9_2"]
+cuda_10_0     = ["gte_cuda_7_0", "gte_cuda_7_5", "gte_cuda_8_0", "gte_cuda_9_0", "gte_cuda_9_1", "gte_cuda_9_2", "gte_cuda_10_0"]
+gte_cuda_7_0  = []
+gte_cuda_7_5  = []
+gte_cuda_8_0  = []
+gte_cuda_9_0  = []
+gte_cuda_9_1  = []
+gte_cuda_9_2  = []
+gte_cuda_10_0 = []
+
+[dependencies]
+static_assertions = "0.3.1"

src/cuda_fp16.rs

@@ -1,8 +1,17 @@
+#[macro_use] extern crate static_assertions;
+
 pub mod cublas;
 pub mod cuda;
 pub mod cudart;
+#[cfg(feature = "gte_cuda_8_0")]
+pub mod cuda_fp16;
 pub mod vector_types;
 
+#[cfg(feature = "cuda_8_0")]
+const_assert_eq!(cuda_8_0_api_version;  cuda::__CUDA_API_VERSION, 8000);
+#[cfg(feature = "cuda_8_0")]
+const_assert_eq!(cuda_8_0_version;      cuda::CUDA_VERSION,       8000);
+
 #[test]
 fn cuda_version() {
     let mut d_ver = 0;