diff --git a/AK/Platform.h b/AK/Platform.h
new file mode 100644
index 0000000000..55eba697cd
--- /dev/null
+++ b/AK/Platform.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#ifdef __i386__
+#define AK_ARCH_I386 1
+#endif
+
+#ifdef __x86_64__
+#define AK_ARCH_X86_64 1
+#endif
+
+#define ARCH(arch) (defined(AK_ARCH_##arch) && AK_ARCH_##arch)
+
diff --git a/Makefile.common b/Makefile.common
index 2ec359732f..4320617826 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -1,6 +1,6 @@
 ARCH_FLAGS =
 STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation -fno-sized-deallocation
-WARNING_FLAGS = -Werror -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
+WARNING_FLAGS = -Werror -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough -Wno-expansion-to-defined
 FLAVOR_FLAGS = -fno-exceptions -fno-rtti
 OPTIMIZATION_FLAGS = -Os