Squash commits for public release

libs/libobjc/BUILD.gn

@@ -0,0 +1,29 @@
+import("//build/libs/TEMPLATE.gni")
+
+xOS_static_library("libobjc") {
+  sources = [
+    "src/NSObject.mm",
+    "src/class.mm",
+    "src/init.mm",
+    "src/memory.mm",
+    "src/msgsend_$target_arch.S",
+    "src/selector.mm",
+  ]
+
+  include_dirs = [
+    "include/",
+    "//libs/libc/include/",
+    "//libs/",
+  ]
+
+  deplibs = [ "libc" ]
+
+  configs = [ "//build/libs:libobjcc_flags" ]
+
+  # Currently, using Clang+LTO and arm32 as a traget, a weird issue
+  # happens, when linker can't resolve objc_load_function.
+  # Such functions contain `und` instruction and leads to a crash.
+  if (host == "llvm" && target_arch != "arm32") {
+    cflags = [ "-flto" ]
+  }
+}