android: start adding a stub target in the build script; doesn't work at all yet

Author: zhuowei

lib/Basic/Platform.cpp

@@ -58,6 +58,10 @@ StringRef swift::getPlatformNameForTriple(const llvm::Triple &triple) {
     return "watchos";
   }
 
+  if (triple.isAndroid()) {
+    return "android";
+  }
+
   if (triple.isMacOSX())
     return "macosx";
 

utils/build-script-impl

@@ -172,6 +172,7 @@ KNOWN_SETTINGS=(
     swift-enable-ast-verifier   "1"              "If enabled, and the assertions are enabled, the built Swift compiler will run the AST verifier every time it is invoked"
     swift-enable-target-linux   "1"              "Enable compiler support for targeting Linux"
     swift-enable-target-freebsd "1"              "Enable compiler support for targeting FreeBSD"
+    swift-enable-target-android "1"              "Enable compiler support for targeting Android"
     swift-runtime-enable-dtrace "0"              "Enable runtime dtrace support"
     swift-runtime-enable-leak-checker   "0"              "Enable leaks checking routines in the runtime"
     use-gold-linker             ""               "Enable using the gold linker"
@@ -404,6 +405,39 @@ function set_deployment_target_based_options() {
                 )
             fi
 
+            ;;
+            android-*)
+            case ${deployment_target} in
+                android-armv7)
+                    llvm_host_triple="arm-linux-androideabi"
+                    llvm_target_arch="ARM"
+                    cmark_cmake_options=(
+                        -DCMAKE_C_FLAGS="$(cmark_c_flags $deployment_target)"
+                        -DCMAKE_CXX_FLAGS="$(cmark_c_flags $deployment_target)"
+                        -DCMAKE_SYSROOT:PATH="FIXME THE SYSROOT"
+                    )
+                    swift_cmake_options=(
+                        -DSWIFT_HOST_VARIANT_ARCH="armv7"
+                    )
+                    ;;
+                *)
+                    echo "Unknown deployment target"
+                    exit 1
+                    ;;
+            esac
+            native_llvm_build=$(build_directory linux-x86_64 llvm)
+            llvm_cmake_options=(
+                -DCMAKE_OSX_SYSROOT:PATH="FIXME THE SYSROOT"
+                -DLLVM_HOST_TRIPLE:STRING="${llvm_host_triple}"
+            )
+
+            if [[ "${llvm_target_arch}" ]] ; then
+                llvm_cmake_options=(
+                    "${llvm_cmake_options[@]}"
+                    -DLLVM_TARGET_ARCH="${llvm_target_arch}"
+                )
+            fi
+
             ;;
         *)
             echo "Unknown compiler deployment target: $deployment_target"
@@ -771,7 +805,8 @@ for t in ${CROSS_COMPILE_TOOLS_DEPLOYMENT_TARGETS} ; do
         iphonesimulator-i386 | iphonesimulator-x86_64 | \
         iphoneos-arm64 | iphoneos-armv7 | \
         appletvos-arm64 | appletvsimulator-x86_64 | \
-        watchos-armv7k | watchsimulator-i386)
+        watchos-armv7k | watchsimulator-i386 | \
+        android-armv7 )
             CROSS_TOOLS_DEPLOYMENT_TARGETS=(
                 "${CROSS_TOOLS_DEPLOYMENT_TARGETS[@]}"
                 "${t}"
@@ -810,6 +845,7 @@ case "$(uname -s)" in
     Linux)
         STDLIB_DEPLOYMENT_TARGETS=(
             "linux-x86_64"
+            "android-armv7"
         )
         ;;
 
@@ -954,6 +990,10 @@ for deployment_target in "${STDLIB_DEPLOYMENT_TARGETS[@]}"; do
             build_for_this_target=$(not $SKIP_BUILD_WATCHOS_SIMULATOR)
             test_this_target=$(not $SKIP_TEST_WATCHOS_SIMULATOR)
             ;;
+        android-*)
+            build_for_this_target=1
+            test_this_target=1
+            ;;
         *)
             echo "Unknown compiler deployment target: $deployment_target"
             exit 1
@@ -1184,6 +1224,9 @@ function common_cross_c_flags() {
         watchos-armv7k)
             echo "-arch armv7k -mwatchos-version-min=${DARWIN_DEPLOYMENT_VERSION_WATCHOS}"
             ;;
+        android-armv7)
+            echo "-arch armv7"
+            ;;
     esac
 }
 
@@ -1844,7 +1887,7 @@ for deployment_target in "${STDLIB_DEPLOYMENT_TARGETS[@]}"; do
         linux-* | freebsd-* | macosx-*)
             # OK, we can run tests directly.
             ;;
-        iphoneos-* | iphonesimulator-* | appletvos-* | appletvsimulator-* | watchos-* | watchsimulator-*)
+        iphoneos-* | iphonesimulator-* | appletvos-* | appletvsimulator-* | watchos-* | watchsimulator-* | android-* )
             # FIXME: remove this
             # echo "Don't know how to run tests for $deployment_target"
             continue