Fix some problem to build android2.3 on ubuntu11.10 32bit
错误1：
************************************************************
You are attempting to build on a 32-bit system.
Only 64-bit build environments are supported beyond froyo/2.2.
************************************************************
解决：
需要进行如下修改即可，将
./external/clearsilver/cgi/Android.mk
./external/clearsilver/java-jni/Android.mk
./external/clearsilver/util/Android.mk
./external/clearsilver/cs/Android.mk
四个文件中的
LOCAL_CFLAGS += -m64
LOCAL_LDFLAGS += -m64
注释掉，或者将“64”换成“32”
LOCAL_CFLAGS += -m32
LOCAL_LDFLAGS += -m32
然后，将./build/core/main.mk 中的
ifneq (64,$(findstring 64,$(build_arch)))
改为：
ifneq (i686,$(findstring i686,$(build_arch)))
错误2：
host C++: libutils <= frameworks/base/libs/utils/RefBase.cpp
frameworks/base/libs/utils/RefBase.cpp: In member function ‘void android::RefBase::weakref_type::trackMe(bool, bool)’:
frameworks/base/libs/utils/RefBase.cpp:483:67: error: passing ‘const android::RefBase::weakref_impl’ as ‘this’ argument of ‘void android::RefBase::weakref_impl::trackMe(bool, bool)’ discards qualifiers [-fpermissive]
make: *** [out/host/linux-x86/obj/STATIC_LIBRARIES/libutils_intermediates/RefBase.o] 错误 1
解决：
gedit frameworks/base/libs/utils/Android.mk
Change the line:
LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1 $(TOOL_CFLAGS)
To:
LOCAL_CFLAGS += -DLIBUTILS_NATIVE=1 $(TOOL_CFLAGS) –fpermissive
错误3：
host Executable: aapt (out/host/linux-x86/obj/EXECUTABLES/aapt_intermediates/aapt)
out/host/linux-x86/obj/STATIC_LIBRARIES/libcutils_intermediates/libcutils.a(threads.o): In function `thread_store_get':
/home/leno/works/android_dev/bin/system/core/libcutils/threads.c:27: undefined reference to `pthread_getspecific'
out/host/linux-x86/obj/STATIC_LIBRARIES/libcutils_intermediates/libcutils.a(threads.o): In function `thread_store_set':
/home/leno/works/android_dev/bin/system/core/libcutils/threads.c:36: undefined reference to `pthread_key_create'
/home/leno/works/android_dev/bin/system/core/libcutils/threads.c:44: undefined reference to `pthread_setspecific'
collect2: ld returned 1 exit status
make: *** [out/host/linux-x86/obj/EXECUTABLES/aapt_intermediates/aapt] 错误 1
解决：
打开 frameworks/base/tools/aapt/Android.mk
然后打开文件Android.mk，编辑下面一行：
ifeq ($(HOST_OS),linux)
#LOCAL_LDLIBS += -lrt 把这行注释掉，改为下面一行。
LOCAL_LDLIBS += -lrt -lpthread
endif
错误4：
target Dex: core
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# SIGSEGV (0xb) at pc=0x4003d848, pid=7668, tid=2889534320
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_22-b03 mixed mode)
# Problematic frame:
# C [libpthread.so.0+0xa848] pthread_cond_timedwait+0x168
#
# An error report file with more information is saved as hs_err_pid7668.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#
make: *** [out/target/common/obj/JAVA_LIBRARIES/core_intermediates/classes.dex] 已放弃 (core dumped)
解决：
虚拟机给的内存512太小，给个1G试试。然后在本机里打开任务管理器，找到虚拟机进程，优先级设置为实时。给他最多东西。
错误 5：
out/host/linux-x86/obj/STATIC_LIBRARIES/libcutils_intermediates/libcutils.a(threads.o): In function `thread_store_get':
/home/leno/works/android_dev/bin/system/core/libcutils/threads.c:27: undefined reference to `pthread_getspecific'
out/host/linux-x86/obj/STATIC_LIBRARIES/libcutils_intermediates/libcutils.a(threads.o): In function `thread_store_set':
/home/leno/works/android_dev/bin/system/core/libcutils/threads.c:36: undefined reference to `pthread_key_create'
/home/leno/works/android_dev/bin/system/core/libcutils/threads.c:44: undefined reference to `pthread_setspecific'
collect2: ld returned 1 exit status
make: *** [out/host/linux-x86/obj/EXECUTABLES/localize_intermediates/localize] 错误 1
解决：类似问题3
修改./framework/base/tools/localize/Android.mk文件
ifeq ($(HOST_OS),linux)
#LOCAL_LDLIBS += -lrt 把这行注释掉，改为下面一行。
LOCAL_LDLIBS += -lrt -lpthread
endif