[SCons] Add iOS OSXCross support, min version override.

tools/ios_osxcross.py

@@ -0,0 +1,26 @@
+import os
+
+
+def options(opts):
+    opts.Add("ios_triple", "Triple for ios toolchain", "")
+
+
+def exists(env):
+    return "OSXCROSS_IOS" in os.environ
+
+
+def generate(env):
+    compiler_path = "$IPHONEPATH/usr/bin/${ios_triple}"
+    env["CC"] = compiler_path + "clang"
+    env["CXX"] = compiler_path + "clang++"
+    env["AR"] = compiler_path + "ar"
+    env["RANLIB"] = compiler_path + "ranlib"
+    env["SHLIBSUFFIX"] = ".dylib"
+
+    env.Prepend(
+        CPPPATH=[
+            "$IPHONESDK/usr/include",
+            "$IPHONESDK/System/Library/Frameworks/AudioUnit.framework/Headers",
+        ]
+    )
+    env.Append(CCFLAGS=["-stdlib=libc++"])