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diff --git a/ruy/build_defs.bzl.opensource b/ruy/build_defs.bzl.opensource
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+"""Build definitions for Ruy."""
+
+# 1. Enable -mfpu=neon unconditionally on ARM32. If it turns out that we need to support
+#    ARM32 without NEON then we'll implement runtime detection and dispatch at that point.
+# 2. Explicitly pass -O3 on optimization configs where just "-c opt" means "optimize for code size".
+
+def ruy_copts_base():
+    return select({
+        ":armeabi-v7a": [
+            "-mfpu=neon",
+        ],
+        "//conditions:default": [],
+    }) + select({
+        ":optimized": ["-O3"],
+        "//conditions:default": [],
+    })
+
+# Used for targets that are compiled with extra features that are skipped at runtime if unavailable.
+def ruy_copts_skylake():
+    return []
+
+# Used for targets that are compiled with extra features that are skipped at runtime if unavailable.
+def ruy_copts_avx2():
+    return []
+
+# TODO(b/147376783): SSE 4.2 and AVX-VNNI support is incomplete / placeholder.
+# Optimization is not finished. In particular the dimensions of the kernel
+# blocks can be changed as desired.
+#
+# Used for targets that are compiled with extra features that are skipped at runtime if unavailable.
+def ruy_copts_sse42():
+    return []
+
+# TODO(b/147376783): SSE 4.2 and AVX-VNNI support is incomplete / placeholder.
+# Optimization is not finished. In particular the dimensions of the kernel
+# blocks can be changed as desired.
+#
+# Used for targets that are compiled with extra features that are skipped at runtime if unavailable.
+def ruy_copts_avxvnni():
+    return []