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Android NDK链接V8静态库：找不到符号，但他们在那里

2014-06-18 48 views
2

我一直在拉我的头发在这一个。我正在开发Ubuntu 12.04 64位。我创建了一个嵌入了V8的原生Android应用程序，但在重新启动计算机后，它不再与V8链接！我试过重新安装ndk并重新编译V8，但无济于事。看起来链接器确实包含了静态库，但没有找到它们中的符号。我用nm进行了检查，符号似乎在那里。Android NDK链接V8静态库：找不到符号，但他们在那里

当我运行ndk_build，我得到下面的输出：

$ 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 ...

特别是，该行告诉我，* .a文件包括：

/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Android.mk外观像这样：

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命令是凭经验确定的。我更多地摆弄它，但无济于事。我甚至尝试了LOCAL_WHOLE_STATIC_LIBRARIES。我检查了nm的符号的存在：

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

我不是专家在名称munging，但它似乎他们在那里。值都是零，但我认为这是正常的。

所以我想，也许链接器不理解静态库，它失败的默默。
但是，如何检查链接程序为何无法获取符号？

来源

2014-06-18 Boris van Schooten

回答

4

我终于在朋友的帮助下修好了。首先，我尝试了一种解决方法，我尝试将V8作为共享库链接，但由于NDK native activity interface I'm using turned out to be incompatible with loading additional shared objects的原因，结果并不好。

我的静态库有两个不同的问题。第一个也是最重要的一点是，由V8构建的静态库不适合链接。您可以使用以下方法检查：

ar x [static_library.a]

通常会从库中提取* .o对象。在这种情况下，该公司报告：

`x' cannot be used on thin archives

薄档案只是一组到* .o文件的绝对路径引用，并没有实际的内容。这就解释了为什么我的构建在我移动或从V8构建树中删除原始* .o文件的某一点停止工作。奇怪的是，链接者对此保持沉默。

在V8中创建静态库目前不是构建选项。谢天谢地，this guy has a patch用于在V8中创建适当的静态库。

该应用程序仍然没有链接后，我这样做，因为我第一次复制错误的文件。事实证明，静态库也是为主机架构而建的（不要问我为什么），而且我意外地复制了这些库。我了解到，您可以使用：

file objectfile.o

了解它是什么架构。因此我发现我的静态库是i386而不是arm。所以，链接器跳过这些文件，因为架构不匹配（您可以在静态库中混合架构）。

下面是我根据Curu Wong的补丁制作的V8 3.27.28版本的V8补丁程序。我会尝试获得这个补丁。膜片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)', 
     ],

补丁2：

~/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)', 
      ],

来源

2014-06-18 22:36:29

+1

你的先生，是发出了神。这与'standalone_static_library'完美结合：1还添加到了v8_libplatform和v8_libbase。 – GambitSunob

+0

@Boris van Schooten：你在哪里发现如何使用'ar x'？谷歌不是很有帮助。我有一个与我自己的静态库类似的问题。当我运行'ar x libMyLibrary.a'时，我得到一个“Blah.o没有这样的文件或目录”错误的负载。我的.a文件与.o文件位于不同的位置..我不知道这是否是问题。 – SparkyNZ

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