Android NDK链接V8静态库:找不到符号，但它们在那里
Android NDK linking V8 static library: cannot find symbols, but they are there
我一直在为这件事烦恼。我正在开发Ubuntu 12.04 64位。我创建了一个内置V8的原生Android应用程序，但在重启我的计算机后，它不再与V8连接了!我试过重新安装ndk和重新编译V8，但无济于事。看起来链接器确实包含静态库，但没有在其中找到符号。我和nm核对了一下，这些符号似乎在那里。
当我运行ndk_build时，我得到以下输出:
$ ndk-build V=1
rm -f ./libs/armeabi/lib*.so ./libs/armeabi-v7a/lib*.so ./libs/armeabi-v7a-hard/lib*.so ./libs/mips/lib*.so ./libs/x86/lib*.so
rm -f ./libs/armeabi/gdbserver ./libs/armeabi-v7a/gdbserver ./libs/armeabi-v7a-hard/gdbserver ./libs/mips/gdbserver ./libs/x86/gdbserver
rm -f ./libs/armeabi/gdb.setup ./libs/armeabi-v7a/gdb.setup ./libs/armeabi-v7a-hard/gdb.setup ./libs/mips/gdb.setup ./libs/x86/gdb.setup
[armeabi] Compile++ thumb: native-activity <= main.cpp
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ -MMD -MP -MF ./obj/local/armeabi/objs/native-activity/main.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -fno-exceptions -fno-rtti -mthumb -Os -g -DNDEBUG -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -Ijni/include -I/home/schooten/bin/packages/android-ndk-r9d/sources/android/native_app_glue -I/home/schooten/bin/packages/android-ndk-r9d/sources/cxx-stl/system/include -Ijni -DANDROID -Wa,--noexecstack -Wformat -Werror=format-security -I/home/schooten/bin/packages/android-ndk-r9d/platforms/android-9/arch-arm/usr/include -c jni/main.cpp -o ./obj/local/armeabi/objs/native-activity/main.o
[armeabi] Compile thumb : android_native_app_glue <= android_native_app_glue.c
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -MMD -MP -MF ./obj/local/armeabi/objs/android_native_app_glue/android_native_app_glue.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -no-canonical-prefixes -march=armv5te -mtune=xscale -msoft-float -mthumb -Os -g -DNDEBUG -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -I/home/schooten/bin/packages/android-ndk-r9d/sources/android/native_app_glue -DANDROID -Wa,--noexecstack -Wformat -Werror=format-security -I/home/schooten/bin/packages/android-ndk-r9d/platforms/android-9/arch-arm/usr/include -c /home/schooten/bin/packages/android-ndk-r9d/sources/android/native_app_glue/android_native_app_glue.c -o ./obj/local/armeabi/objs/android_native_app_glue/android_native_app_glue.o
[armeabi] StaticLibrary : libandroid_native_app_glue.a
rm -f obj/local/armeabi/libandroid_native_app_glue.a
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ar crsD ./obj/local/armeabi/libandroid_native_app_glue.a ./obj/local/armeabi/objs/android_native_app_glue/android_native_app_glue.o
[armeabi] StaticLibrary : libstdc++.a
rm -f obj/local/armeabi/libstdc++.a
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ar crsD ./obj/local/armeabi/libstdc++.a
[armeabi] SharedLibrary : libnative-activity.so
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ -Wl,-soname,libnative-activity.so -shared --sysroot=/home/schooten/bin/packages/android-ndk-r9d/platforms/android-9/arch-arm ./obj/local/armeabi/objs/native-activity/main.o ./obj/local/armeabi/libandroid_native_app_glue.a jni/lib/libv8_libbase.arm.a jni/lib/libv8_nosnapshot.a jni/lib/libv8_base.a jni/lib/libstlport_static.a ./obj/local/armeabi/libstdc++.a -lgcc -no-canonical-prefixes -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -L/home/schooten/bin/packages/android-ndk-r9d/platforms/android-9/arch-arm/usr/lib -llog -landroid -lEGL -lGLESv1_CM -llog -lstdc++ -lc -lm -o ./obj/local/armeabi/libnative-activity.so
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function __clearColor(v8::FunctionCallbackInfo<v8::Value> const&):jni/main.cpp:88: error: undefined reference to 'v8::Value::Int32Value() const'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function __clearColor(v8::FunctionCallbackInfo<v8::Value> const&):jni/main.cpp:89: error: undefined reference to 'v8::Value::Int32Value() const'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function __clearColor(v8::FunctionCallbackInfo<v8::Value> const&):jni/main.cpp:90: error: undefined reference to 'v8::Value::Int32Value() const'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function __clearColor(v8::FunctionCallbackInfo<v8::Value> const&):jni/main.cpp:91: error: undefined reference to 'v8::Value::Int32Value() const'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function run_javascript(char*):jni/main.cpp:101: error: undefined reference to 'v8::Isolate::New()'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function run_javascript(char*):jni/include/v8.h:4045: error: undefined reference to 'v8::Isolate::Enter()'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function run_javascript(char*):jni/main.cpp:104: error: undefined reference to 'v8::HandleScope::HandleScope(v8::Isolate*)'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function run_javascript(char*):jni/main.cpp:108: error: undefined reference to 'v8::ObjectTemplate::New(v8::Isolate*)'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function run_javascript(char*):jni/main.cpp:110: error: undefined reference to 'v8::ObjectTemplate::New(v8::Isolate*)'
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/native-activity/main.o: in function run_javascript(char*):jni/main.cpp:112: error: undefined reference to 'v8::String::NewFromUtf8(v8::Isolate*, char const*, v8::String::NewStringType, int)'
... etc ...
特别地，这一行告诉我*。A文件包含:
/home/schooten/bin/packages/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ -Wl,-soname,libnative-activity.so -shared --sysroot=/home/schooten/bin/packages/android-ndk-r9d/platforms/android-9/arch-arm ./obj/local/armeabi/objs/native-activity/main.o ./obj/local/armeabi/libandroid_native_app_glue.a jni/lib/libv8_libbase.arm.a jni/lib/libv8_nosnapshot.a jni/lib/libv8_base.a jni/lib/libstlport_static.a ./obj/local/armeabi/libstdc++.a -lgcc -no-canonical-prefixes -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -L/home/schooten/bin/packages/android-ndk-r9d/platforms/android-9/arch-arm/usr/lib -llog -landroid -lEGL -lGLESv1_CM -llog -lstdc++ -lc -lm -o ./obj/local/armeabi/libnative-activity.so
我的Android。Mk是这样的:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := stlport
LOCAL_MODULE_FILENAME := stlport_static
LOCAL_SRC_FILES := lib/libstlport_static.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := v8_base
LOCAL_MODULE_FILENAME := v8_base_static
LOCAL_SRC_FILES := lib/libv8_base.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := v8_nosnapshot
LOCAL_MODULE_FILENAME := v8_nosnapshot_static
LOCAL_SRC_FILES := lib/libv8_nosnapshot.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := v8_libbase
LOCAL_MODULE_FILENAME := v8_libbase_static
LOCAL_SRC_FILES := lib/libv8_libbase.arm.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := native-activity
LOCAL_SRC_FILES := main.cpp
LOCAL_LDLIBS := -llog -landroid -lEGL -lGLESv1_CM
LOCAL_STATIC_LIBRARIES := android_native_app_glue v8_libbase v8_nosnapshot v8_base stlport
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
include $(BUILD_SHARED_LIBRARY)
$(call import-module,android/native_app_glue)
LOCAL_STATIC_LIBRARIES顺序是经验确定的。我又摆弄了一下，但无济于事。我甚至尝试了LOCAL_WHOLE_STATIC_LIBRARIES。我用nm检查符号是否存在:
arm-linux-gnueabi-nm jni/lib/libv8_base.a | grep Int32Value
U _ZNK2v85Value10Int32ValueEv
00000000 T _ZNK2v85Value10Int32ValueEv
U _ZNK2v85Value10Int32ValueEv
arm-linux-gnueabi-nm jni/lib/libv8_base.a | grep Utf8Value
00000000 T _ZN2v86String9Utf8ValueC1ENS_6HandleINS_5ValueEEE
00000000 T _ZN2v86String9Utf8ValueC2ENS_6HandleINS_5ValueEEE
00000000 T _ZN2v86String9Utf8ValueD1Ev
00000000 T _ZN2v86String9Utf8ValueD2Ev
U _ZN2v86String9Utf8ValueC1ENS_6HandleINS_5ValueEEE
U _ZN2v86String9Utf8ValueD1Ev
U _ZN2v86String9Utf8ValueC1ENS_6HandleINS_5ValueEEE
U _ZN2v86String9Utf8ValueD1Ev
U _ZN2v86String9Utf8ValueC1ENS_6HandleINS_5ValueEEE
U _ZN2v86String9Utf8ValueD1Ev
U _ZN2v86String9Utf8ValueC1ENS_6HandleINS_5ValueEEE
U _ZN2v86String9Utf8ValueD1Ev
U _ZN2v86String9Utf8ValueC1ENS_6HandleINS_5ValueEEE
U _ZN2v86String9Utf8ValueD1Ev
我不是名字篡改方面的专家，但他们似乎在那里。值都是0，但我认为这是正常的。
所以我想，也许链接器不理解静态库，它默默地失败了。
但是，我如何检查为什么链接器无法拾取符号?
在一个朋友的帮助下，我终于修好了它。首先，我尝试了一个解决方案，我试图将V8链接为共享库，结果并不好，因为我使用的NDK原生活动接口与加载额外的共享对象不兼容。
在我的静态库中有两个不同的问题。第一个也是最重要的一点是，V8构建的静态库不适合链接。您可以使用以下命令检查:ar x [static_library.a]
通常会提取*。库中的0个对象。在本例中，它报告:
`x' cannot be used on thin archives
一个精简归档文件只是一组对*的绝对路径的引用。O文件，没有实际内容。这解释了为什么我的构建在移动或删除原始*时停止工作。从V8构建树中获取0个文件。奇怪的是，链接器对此保持沉默。
创建静态库目前不是V8的构建选项。值得庆幸的是，这个家伙有一个补丁用于在V8中创建适当的静态库。
在我这样做之后，应用程序仍然没有链接，因为我第一次复制了错误的文件。事实证明，静态库也是为主机体系结构构建的(不要问我为什么)，我不小心复制了它们。我学会了你可以使用:
file objectfile.o
查看它是什么架构。因此，我发现我的静态库是i386而不是arm。因此，链接器跳过这些文件，因为体系结构不匹配(您可以在静态库中混合体系结构)。
这是我根据Curu Wong的补丁制作的V8 3.27.28补丁。我会尽量提交这个补丁。补丁1:
~/Work/javascript/Engines/v8-trunk/tools/gyp$ diff -u v8.gyp.orig v8.gyp
--- v8.gyp.orig 2014-06-18 21:09:59.368336736 +0200
+++ v8.gyp 2014-06-18 21:12:20.264331660 +0200
@@ -108,6 +108,7 @@
{
'target_name': 'v8_snapshot',
'type': 'static_library',
+ 'standalone_static_library': 1,
'conditions': [
['want_separate_host_toolset==1', {
'toolsets': ['host', 'target'],
@@ -180,6 +181,7 @@
{
'target_name': 'v8_nosnapshot',
'type': 'static_library',
+ 'standalone_static_library': 1,
'dependencies': [
'v8_base',
],
@@ -237,6 +239,7 @@
{
'target_name': 'v8_base',
'type': 'static_library',
+ 'standalone_static_library': 1,
'dependencies': [
'v8_libbase.<(v8_target_arch)',
],
~/Work/javascript/Engines/v8-trunk/third_party/icu$ diff -u icu.gyp.orig icu.gyp
--- icu.gyp.orig 2014-06-18 21:10:22.060335920 +0200
+++ icu.gyp 2014-06-18 21:15:06.468325674 +0200
@@ -56,6 +56,7 @@
{
'target_name': 'icudata',
'type': 'static_library',
+ 'standalone_static_library': 1,
'defines': [
'U_HIDE_DATA_SYMBOL',
],
@@ -141,6 +142,11 @@
{
'target_name': 'icui18n',
'type': '<(component)',
+ 'conditions': [
+ [ 'component!="shared_library"', {
+ 'standalone_static_library': 1,
+ }],
+ ],
'sources': [
'<@(icui18n_sources)',
],
@@ -241,6 +247,11 @@
{
'target_name': 'icuuc',
'type': '<(component)',
+ 'conditions': [
+ [ 'component!="shared_library"', {
+ 'standalone_static_library': 1,
+ }],
+ ],
'sources': [
'<@(icuuc_sources)',
],
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