从Android 2.2之后，编译需要在64位的环境下进行。
如果想在32位的环境下编译，需要做一点修改。
如下所示：
1. 修改<src>/build/core/config.mk
找到下面的代码，
ifeq ($(HOST_OS),darwin) # Mac OS' screwy version of java uses a non-standard directory layout # and doesn't even seem to have tools.jar. On the other hand, javac seems # to be able to magically find the classes in there, wherever they are, so # leave this blank HOST_JDK_TOOLS_JAR := else HOST_JDK_TOOLS_JAR:= $(shell $(BUILD_SYSTEM)/find-jdk-tools-jar.sh) endif
在其后添加如下代码：
# Is the host JDK 64-bit version? HOST_JDK_IS_64BIT_VERSION := ifneq ($(filter 64-Bit, $(shell java -version 2>&1)),) HOST_JDK_IS_64BIT_VERSION := true endif
参见https://review.source.android.com/#patch,sidebyside,23134,1,core/config.mk
2. 修改<src>/build/core/main.mk
找到下面的代码，把它们注释掉，或删除掉。
ifeq ($(BUILD_OS),linux) build_arch := $(shell uname -m) ifneq (64,$(findstring 64,$(build_arch))) $(warning ************************************************************) $(warning You are attempting to build on a 32-bit system.) $(warning Only 64-bit build environments are supported beyond froyo/2.2.) $(warning ************************************************************) $(error stop) endif endif
参见https://review.source.android.com/#patch,sidebyside,23134,1,core/main.mk
好了，现在就可以在32位的环境下进行编译了。
