cc_baremetal_defaults: Disable SVE

Prevent Clang from generating SVE instructions for compiler targets that
default to enabling the feature (such as ARMv9.2-A; see [1]) as the
baremetal environment might not have SVE available (either due to the HW
not supporting it or the SW not having enabled it).

[1]: https://reviews.llvm.org/D109517

Bug: 364383722
Test: lunch <...>  # Set TARGET_ARCH_VARIANT=armv9-2a
Test: m pvmfw      # Decompile & check for SVE instructions
Change-Id: Ic50d9dc45beb1d04d81e3accaf7fc4fc953ea703

1 files changed, 10 insertions, 0 deletions

diff --git a/Android.bp b/Android.bp
index 34f9bf012..6db496361 100644
--- a/Android.bp
+++ b/Android.bp
@@ -147,6 +147,16 @@ all_apex_contributions {
 // Framework guests.
 cc_defaults {
     name: "cc_baremetal_defaults",
+    arch: {
+        arm64: {
+            cflags: [
+                // Prevent the compiler from optimizing code using SVE, as the
+                // baremetal environment might not have configured the hardware.
+                "-Xclang -target-feature",
+                "-Xclang -sve",
+            ],
+        },
+    },
     defaults_visibility: ["//visibility:public"],
 }