Android support (#4606)

* Add android aarch64 support into c-api * Remove target test and clean up CMake script c-api * Deduplicate ExternalProject_Add in c-api Android support
bytecodealliance · Aug 30, 2022 · e910b8f · e910b8f
1 parent 52d88fa
commit e910b8f
Showing 1 changed file with 78 additions and 17 deletions.
diff --git a/crates/c-api/CMakeLists.txt b/crates/c-api/CMakeLists.txt
@@ -2,14 +2,14 @@ cmake_minimum_required(VERSION 3.10)
 
 option(BUILD_SHARED_LIBS "Build using shared libraries" OFF)
 
-if (CMAKE_BUILD_TYPE STREQUAL "Release")
+if(CMAKE_BUILD_TYPE STREQUAL "Release")
 	set(WASMTIME_BUILD_TYPE_FLAG "--release")
 	set(WASMTIME_BUILD_TYPE "release")
 else()
 	set(WASMTIME_BUILD_TYPE "debug")
 endif()
 
-if (BUILD_SHARED_LIBS)
+if(BUILD_SHARED_LIBS)
 	# Copy shared library into build directory
 	if(WIN32)
 		set(WASMTIME_INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_if_different
@@ -26,39 +26,100 @@ if (BUILD_SHARED_LIBS)
 	endif()
 endif()
 
+if(ANDROID)
+	# TODO wasmtime only supports arm64-v8a right now
+	if(ANDROID_ABI STREQUAL "armeabi-v7a")
+		set(ANDROID_TARGET "armv7-linux-androideabi")
+		set(ANDROID_ARCH_SHORT "arm")
+	elseif(ANDROID_ABI STREQUAL "arm64-v8a")
+		set(ANDROID_TARGET "aarch64-linux-android")
+		set(ANDROID_ARCH_SHORT "aarch64")
+	elseif(ANDROID_ABI STREQUAL "x86")
+		set(ANDROID_TARGET "i686-linux-android")
+		set(ANDROID_ARCH_SHORT "i386")
+	elseif(ANDROID_ABI STREQUAL "x86_64")
+		set(ANDROID_TARGET "x86_64-linux-android")
+		set(ANDROID_ARCH_SHORT "x86_64")
+	endif()
+
+	set(WASMTIME_BUILD_TARGET "--target=${ANDROID_TARGET}")
+endif()
+
+if (BUILD_SHARED_LIBS AND ANDROID)
+	message(FATAL_ERROR "Wasmtime cannot be built with BUILD_SHARED_LIBS on Android")
+endif()
+
+if(BUILD_SHARED_LIBS)
+	if(WIN32)
+		set(WASMTIME_BUILD_PRODUCT
+			${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/wasmtime.dll.lib)
+	elseif(APPLE)
+		set(WASMTIME_BUILD_PRODUCT
+			${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/libwasmtime.dylib)
+	else()
+		set(WASMTIME_BUILD_PRODUCT
+			${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/libwasmtime.so)
+	endif()
+else()
+	if(WIN32)
+		set(WASMTIME_BUILD_PRODUCT
+			${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/wasmtime.lib)
+	elseif(ANDROID)
+		set(WASMTIME_BUILD_PRODUCT
+			${CMAKE_CURRENT_SOURCE_DIR}/../../target/${ANDROID_TARGET}/${WASMTIME_BUILD_TYPE}/libwasmtime.a)
+	else()
+		set(WASMTIME_BUILD_PRODUCT
+			${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/libwasmtime.a)
+	endif()
+endif()
+
+if(ANDROID)
+	# Rust attempts to use libgcc.a on NDK versions r23-beta3 and up
+	# but it has been replaced with libunwind.a (rust-lang/rust#85806)
+	file(WRITE ${CMAKE_BINARY_DIR}/libgcc.a "INPUT(-lunwind)")
+	# The version of the clang compiler is part of the libunwind.a path
+	file(STRINGS ${ANDROID_TOOLCHAIN_ROOT}/AndroidVersion.txt CLANG_VERSION_FILE)
+	list(GET CLANG_VERSION_FILE 0 CLANG_VERSION)
+
+	# Some crates use the compiler directly, environment variables
+	# are set to make them use the Android compiler
+	set(WASMTIME_PREBUILD_COMMAND ${CMAKE_COMMAND} -E env
+	CC=${ANDROID_TOOLCHAIN_ROOT}/bin/clang
+	AR=${ANDROID_TOOLCHAIN_ROOT}/bin/llvm-ar
+	"RUSTFLAGS=-L ${CMAKE_SYSROOT}/usr/lib/${ANDROID_TARGET}/${ANDROID_NATIVE_API_LEVEL} \
+		-L ${ANDROID_TOOLCHAIN_ROOT}/lib64/clang/${CLANG_VERSION}/lib/linux/${ANDROID_ARCH_SHORT} \
+		-L ${CMAKE_BINARY_DIR} -C linker=${ANDROID_TOOLCHAIN_ROOT}/bin/ld")
+endif()
 include(ExternalProject)
 ExternalProject_Add(
 	wasmtime-crate
 	DOWNLOAD_COMMAND ""
 	CONFIGURE_COMMAND ""
 	INSTALL_COMMAND "${WASMTIME_INSTALL_COMMAND}"
-	BUILD_COMMAND cargo build ${WASMTIME_BUILD_TYPE_FLAG}
+	BUILD_COMMAND ${WASMTIME_PREBUILD_COMMAND} cargo build ${WASMTIME_BUILD_TYPE_FLAG} ${WASMTIME_BUILD_TARGET}
 	BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR}
-	BUILD_ALWAYS ON)
+	BUILD_ALWAYS ON
+	BUILD_BYPRODUCTS ${WASMTIME_BUILD_PRODUCT})
 add_library(wasmtime INTERFACE)
 add_dependencies(wasmtime wasmtime-crate)
 
-if (BUILD_SHARED_LIBS)
-	if(WIN32)
-		target_link_libraries(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/wasmtime.dll.lib)
-	elseif(APPLE)
-		target_link_libraries(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/libwasmtime.dylib)
-		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-rpath='$ORIGIN'")
-	else()
-		target_link_libraries(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/libwasmtime.so)
+if(BUILD_SHARED_LIBS)
+	if(NOT WIN32)
 		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-rpath='$ORIGIN'")
 	endif()
+	target_link_libraries(wasmtime INTERFACE ${WASMTIME_BUILD_PRODUCT})
 else()
 	if(WIN32)
 		target_compile_options(wasmtime INTERFACE -DWASM_API_EXTERN= -DWASI_API_EXTERN=)
-		target_link_libraries(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/wasmtime.lib
+		target_link_libraries(wasmtime INTERFACE ${WASMTIME_BUILD_PRODUCT}
 			ws2_32 advapi32 userenv ntdll shell32 ole32 bcrypt)
-	elseif(APPLE)
-		target_link_libraries(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/libwasmtime.a)
+	elseif(APPLE OR ANDROID)
+		target_link_libraries(wasmtime INTERFACE ${WASMTIME_BUILD_PRODUCT})
 	else()
-		target_link_libraries(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/../../target/${WASMTIME_BUILD_TYPE}/libwasmtime.a
+		target_link_libraries(wasmtime INTERFACE ${WASMTIME_BUILD_PRODUCT}
 			pthread dl m)
 	endif()
 endif()
 
-target_include_directories(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include ${CMAKE_CURRENT_SOURCE_DIR}/wasm-c-api/include)
+target_include_directories(wasmtime INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include
+	${CMAKE_CURRENT_SOURCE_DIR}/wasm-c-api/include)