我正在尝试用 android-ndk-r8b
编译这个简单的程序:
jni/hello_jni.cpp
#include <iostream>
#include <thread>
void hello()
{
std::cout << "Hi i'm a thread!!!" << std::endl;
}
int main()
{
std::thread th(hello);
th.join();
return 0;
}
jni/Application.mk
APP_OPTIM := release
APP_MODULES := hello_thread
APP_STL := gnustl_static
jni/Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_CPPFLAGS += -std=c++0x -frtti
LOCAL_MODULE := hello_thread
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -pthread
LOCAL_SRC_FILES := hello_thread.cpp
include $(BUILD_EXECUTABLE)
ndk-build 返回一个错误参数“thread”不是“std”的成员。 我发出 ndk-build -n 来获取编译命令并在我的 shell 中单独发出它:
/home/evigier/android-ndk-r8b/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi-g++ -MMD -MP -MF /home/evigier/eclipse_workspace/hello_thread/obj/local/armeabi/objs/hello_thread/hello_thread.o.d -fpic -ffunction-sections -funwind-tables -fstack-protector -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -march=armv5te -mtune=xscale -msoft-float -fno-exceptions -fno-rtti -mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64 -I/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include -I/home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi/include -I/home/evigier/eclipse_workspace/hello_thread/jni -DANDROID -Wa,--noexecstack -std=c++0x -frtti -O2 -DNDEBUG -g -I/home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include -c /home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp -o /home/evigier/eclipse_workspace/hello_thread/obj/local/armeabi/objs/hello_thread/hello_thread.o
Compile++ thumb : hello_thread <= hello_thread.cpp
In file included from /home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/stdio.h:55:0,
from /home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/wchar.h:33,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/cwchar:46,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/bits/postypes.h:42,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/iosfwd:42,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/ios:39,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/ostream:40,
from /home/evigier/android-ndk-r8b/sources/cxx-stl/gnu-libstdc++/4.6/include/iostream:40,
from jni/hello_thread.cpp:4:
/home/evigier/android-ndk-r8b/platforms/android-14/arch-arm/usr/include/sys/types.h:124:9: error: 'uint64_t' does not name a type
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp: In function 'int main()':
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp:14:5: error: 'thread' is not a member of 'std'
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp:14:17: error: expected ';' before 'th'
/home/evigier/eclipse_workspace/hello_thread/jni/hello_thread.cpp:15:5: error: 'th' was not declared in this scope
我阅读了很多关于 POSIX 线程和 C++ 线程的线程/问题,但仍然找不到我的答案。我的 arm-linux-androideabi/include/c++/4.6/thread
文件仅在 std
中定义了 class thread
:
#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
它们似乎没有在我的 sdk (c++config.h) 中定义。但是我怎么可能安全地打开它们呢?我是否需要编译自己的工具链才能使用(非 p)线程?我的主机是:
Linux evigier-ThinkPad-X220 3.0.0-17-generic #30-Ubuntu SMP Thu Mar 8 20:45:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
最佳答案
Android NDK r8b 附带 gcc 4.6,不包含任何 C++11 线程的实现。您将必须提供自己的实现,并可能构建自己的独立 gcc 工具链。
检查这些页面以了解 gcc 对 C++11 的支持:
- http://gcc.gnu.org/projects/cxx0x.html
- http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.200x
POSIX 线程是一个完全不同的故事,您可以在 Android NDK 中使用它们。您至少需要 pthread_create()
、pthread_detach()
和 pthread_join()
调用才能完成此操作。
关于c++ - 如何在 Android NDK 中使用 c++0x 线程?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11730111/