Auto merge of #16769 - MortimerGoro:android_archs, r=larsbergstrom

Support for Android armv7 and aarch64 target triples

<!-- Please describe your changes on the following line: -->

Support for Android armv7 and aarch64 target triples in python build scripts (build + packaging)

`--android` build parameter works as always (arm-linux-androideabi still the default)
`./mach build --release --android`

New compilation modes for android
`./mach build --release --target=arm-linux-androideabi`
`./mach build --release --target=armv7-linux-androideabi`
`./mach build --release --target=aarch64-linux-android`

See https://github.com/servo/servo/issues/11921. When all crates are ready we'll switch default android compilations to` armv7-linux-androideabi` target triple.

---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

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- [x] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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1 files changed, 26 insertions, 3 deletions

diff --git a/python/servo/command_base.py b/python/servo/command_base.py
index 7ab5191b41a..8f04fde27e4 100644
--- a/python/servo/command_base.py
+++ b/python/servo/command_base.py
@@ -277,8 +277,7 @@ class CommandBase(object):
         self.config["android"].setdefault("sdk", "")
         self.config["android"].setdefault("ndk", "")
         self.config["android"].setdefault("toolchain", "")
-        self.config["android"].setdefault("platform", "android-18")
-        self.config["android"].setdefault("target", "arm-linux-androideabi")
+        self.handle_android_target("arm-linux-androideabi")
 
         self.set_cargo_root()
         self.set_use_stable_rust(False)
@@ -538,7 +537,31 @@ class CommandBase(object):
         return path.join(self.context.topdir, "support", "android")
 
     def android_build_dir(self, dev):
-        return path.join(self.get_target_dir(), "arm-linux-androideabi", "debug" if dev else "release")
+        return path.join(self.get_target_dir(), self.config["android"]["target"], "debug" if dev else "release")
+
+    def handle_android_target(self, target):
+        if target == "arm-linux-androideabi":
+            self.config["android"]["platform"] = "android-18"
+            self.config["android"]["target"] = target
+            self.config["android"]["arch"] = "arm"
+            self.config["android"]["lib"] = "armeabi"
+            self.config["android"]["toolchain_name"] = target + "-4.9"
+            return True
+        elif target == "armv7-linux-androideabi":
+            self.config["android"]["platform"] = "android-18"
+            self.config["android"]["target"] = target
+            self.config["android"]["arch"] = "arm"
+            self.config["android"]["lib"] = "armeabi-v7a"
+            self.config["android"]["toolchain_name"] = "arm-linux-androideabi-4.9"
+            return True
+        elif target == "aarch64-linux-android":
+            self.config["android"]["platform"] = "android-21"
+            self.config["android"]["target"] = target
+            self.config["android"]["arch"] = "arm64"
+            self.config["android"]["lib"] = "arm64-v8a"
+            self.config["android"]["toolchain_name"] = target + "-4.9"
+            return True
+        return False
 
     def ensure_bootstrapped(self, target=None):
         if self.context.bootstrapped: