optionally use libssh2 from vcpkg for msvc abi builds

2 files changed, 37 insertions, 0 deletions

diff --git a/libssh2-sys/Cargo.toml b/libssh2-sys/Cargo.toml
index 8277813..5b187d2 100644
--- a/libssh2-sys/Cargo.toml
+++ b/libssh2-sys/Cargo.toml
@@ -22,3 +22,6 @@ openssl-sys = "0.9"
 [build-dependencies]
 pkg-config = "0.3"
 cmake = "0.1.2"
+
+[target.'cfg(target_env = "msvc")'.build-dependencies]
+vcpkg = "0.2"
diff --git a/libssh2-sys/build.rs b/libssh2-sys/build.rs
index 0b6906e..0ab9005 100644
--- a/libssh2-sys/build.rs
+++ b/libssh2-sys/build.rs
@@ -1,6 +1,9 @@
 extern crate pkg_config;
 extern crate cmake;
 
+#[cfg(target_env = "msvc")]
+extern crate vcpkg;
+
 use std::env;
 use std::fs::File;
 use std::io::prelude::*;
@@ -8,6 +11,10 @@ use std::path::{PathBuf, Path};
 use std::process::Command;
 
 fn main() {
+    if try_vcpkg() {
+        return;
+    }
+
     register_dep("Z");
     register_dep("OPENSSL");
 
@@ -117,3 +124,30 @@ fn prepend(var: &str, val: PathBuf) {
     v.extend(env::split_paths(&prefix));
     env::set_var(var, &env::join_paths(v).unwrap());
 }
+
+#[cfg(not(target_env = "msvc"))]
+fn try_vcpkg() -> bool { false }
+
+#[cfg(target_env = "msvc")]
+fn try_vcpkg() -> bool {
+    vcpkg::Config::new()
+        .emit_includes(true)
+        .probe("libssh2").map(|_| {
+
+        // found libssh2 which depends on openssl and zlib
+        vcpkg::Config::new()
+            .lib_name("libeay32")
+            .lib_name("ssleay32")
+            .probe("openssl").expect("configured libssh2 from vcpkg but could not \
+                                      find openssl libraries that it depends on");
+
+        vcpkg::Config::new()
+            .lib_names("zlib", "zlib1")
+            .probe("zlib").expect("configured libssh2 from vcpkg but could not \
+                                   find the zlib library that it depends on");
+
+        println!("cargo:rustc-link-lib=crypt32");
+        println!("cargo:rustc-link-lib=gdi32");
+        println!("cargo:rustc-link-lib=user32");
+    }).is_ok()
+}