Merge pull request #19 from paritytech/andre/support-windows-build-static-crt

Fix build issues on Windows and ARM

Author: debris

rocksdb-sys/build.rs

@@ -18,11 +18,22 @@ fn main() {
 
         println!("cargo:rustc-link-lib=dylib={}", "rpcrt4");
         println!("cargo:rustc-link-lib=dylib={}", "shlwapi");
+
+        let features = env::var("CARGO_CFG_TARGET_FEATURE").unwrap_or_default();
+        if features.contains("crt-static") {
+            cfg.define("WITH_MD_LIBRARY", "OFF");
+        }
     } else {
         cfg.define("SNAPPY_INCLUDE_DIR", snappy)
             .define("SNAPPY_LIBRARIES", "/dev/null");
     }
 
+    // NOTE: the cfg! macro doesn't work when cross-compiling, it would return values for the host
+    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default();
+    if target_arch == "arm" || target_arch == "aarch64" {
+        cfg.define("PORTABLE", "ON");
+    }
+
     let out = cfg.build();
 
     let mut build = out.join("build");