Add a feature to openssl-sys to cause it to build a local copy of libressl for

use instead of whatever pkg-config says (which in the case of crosses, is almost
certainly incorrect). This is for PNaCl.

openssl-sys/Cargo.toml

@@ -18,3 +18,12 @@ aes_xts = []
 
 [build-dependencies]
 pkg-config = "0.1"
+
+[target.le32-unknown-nacl.dependencies]
+libressl-pnacl-sys = "2.1.0"
+[target.x86_64-unknown-nacl.dependencies]
+libressl-pnacl-sys = "2.1.0"
+[target.i686-unknown-nacl.dependencies]
+libressl-pnacl-sys = "2.1.0"
+[target.arm-unknown-nacl.dependencies]
+libressl-pnacl-sys = "2.1.0"

openssl-sys/src/build.rs

@@ -3,6 +3,11 @@ extern crate "pkg-config" as pkg_config;
 use std::os;
 
 fn main() {
+    // Without hackory, pkg-config will only look for host libraries.
+    // So, abandon ship if we're cross compiling.
+    if os::getenv("HOST") != os::getenv("TARGET") { return; }
+
+
     if pkg_config::find_library("openssl").is_err() {
         let mut flags = " -l crypto -l ssl".to_string();
 

openssl-sys/src/lib.rs

@@ -4,6 +4,9 @@
 extern crate libc;
 extern crate rustrt;
 
+#[cfg(feature = "libressl-pnacl-sys")]
+extern crate "libressl-pnacl-sys" as _for_linkage;
+
 use libc::{c_void, c_int, c_char, c_ulong, c_long, c_uint, c_uchar, size_t};
 use std::mem;
 use std::ptr;