[arm64] Build NDK with PAuth and BTI
This change adds a new arch named "armv8-a-branchprot". The new target
is no different from the usual "armv8-a" variant except it has the
compiler flag "-mbranch-protection=standard" set.
With this flag compiler emits Armv8.3-A Pointer Authentication and
Armv8.5-A Branch Target Identification instructions. All of these
instructions are in the hint space; therefore devices which do not
support any of these extensions would execute them as NOPs.
In terms of directory structure there is no change in the output of
build/soong/scripts/build-ndk-prebuilts.sh script.
Test: build NDK prebuilts
Change-Id: Ie52ccba5653fbf567f0b7ca312d8a8e71602ad06
diff --git a/android/arch.go b/android/arch.go
index baee9be..a8239a0 100644
--- a/android/arch.go
+++ b/android/arch.go
@@ -1434,7 +1434,7 @@
func getNdkAbisConfig() []archConfig {
return []archConfig{
{"arm", "armv7-a", "", []string{"armeabi-v7a"}},
- {"arm64", "armv8-a", "", []string{"arm64-v8a"}},
+ {"arm64", "armv8-a-branchprot", "", []string{"arm64-v8a"}},
{"x86", "", "", []string{"x86"}},
{"x86_64", "", "", []string{"x86_64"}},
}