Changes required for rustc/cargo to build for iOS targets

Author: aspen

src/bootstrap/lib.rs

@@ -811,6 +811,11 @@ impl Build {
         if target.contains("apple-darwin") {
             base.push("-stdlib=libc++".into());
         }
+        
+        // Required for LLVM to properly compile.
+        if target.contains("apple-ios") {
+            base.push("-miphoneos-version-min=10.0".into());
+        }
 
         // Work around an apparently bad MinGW / GCC optimization,
         // See: http://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html

src/bootstrap/native.rs

@@ -175,6 +175,14 @@ impl Step for Llvm {
             cfg.define("LLVM_ENABLE_ZLIB", "OFF");
         }
 
+        // Are we compiling for iOS/tvOS?
+        if target.contains("apple") && !target.contains("darwin") {
+            cfg.define("CMAKE_OSX_SYSROOT", "/");
+            cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
+            cfg.define("LLVM_ENABLE_PLUGINS", "OFF"); // Prevent cmake from adding -bundle to CFLAGS automatically.
+            cfg.define("LLVM_ENABLE_ZLIB", "OFF");
+        }
+
         if builder.config.llvm_thin_lto {
             cfg.define("LLVM_ENABLE_LTO", "Thin");
             if !target.contains("apple") {