[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
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@@ -1434,7 +1434,7 @@ type archConfig struct {
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func getNdkAbisConfig() []archConfig {
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return []archConfig{
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{"arm", "armv7-a", "", []string{"armeabi-v7a"}},
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{"arm64", "armv8-a", "", []string{"arm64-v8a"}},
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{"arm64", "armv8-a-branchprot", "", []string{"arm64-v8a"}},
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{"x86", "", "", []string{"x86"}},
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{"x86_64", "", "", []string{"x86_64"}},
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}
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