ld 链接生成 so时报错: undefined reference to '__dso_handle'

最新推荐文章于 2024-12-30 10:29:00 发布

huangjiazhi_

最新推荐文章于 2024-12-30 10:29:00 发布

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分类专栏： so 文章标签：问题排查

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本文详细解析了在链接阶段遇到的__dso_handle符号未定义的问题，常见于特定配置下的Android NDK编译环境。通过创建并包含一个提供弱定义__dso_handle的头文件，可以有效解决该问题，确保项目顺利编译。

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问题贴图，附上遇到的情况

ld -shared -o liba.so a.o -L ./lib/zmq -L /usr/lib/x86_64-linux-gnu/ -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_objdetect -lopencv_calib3d -lzmq -lstdc++ -lrt -ldl -lpthread
a.o: In function `__static_initialization_and_destruction_0(int, int)':
a.cpp:(.text+0x3e): undefined reference to `__dso_handle'
ld: a.o: relocation R_X86_64_PC32 against undefined hidden symbol `__dso_handle' can not be used when making a shared object
ld: final link failed: Bad value
make: *** [all] Error 1

error: qrc_qml.obj: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC

error: undefined reference to '__dso_handle'

解决方案，建一个头文件，代码如下，包含到项目里:

extern "C" {
/*
 * To work around http://code.google.com/p/android/issues/detail?id=23203
 * we don't link with the crt objects. In some configurations, this means
 * a lack of the __dso_handle symbol because it is defined there, and
 * depending on the android platform and ndk versions used, it may or may
 * not be defined in libc.so. In the latter case, we fail to link. Defining
 * it here as weak makes us provide the symbol when it's not provided by
 * the crt objects, making the change transparent for future NDKs that
 * would fix the original problem. On older NDKs, it is not a problem
 * either because the way __dso_handle was used was already broken (and
 * the custom linker works around it).
 */
  NS_EXPORT __attribute__((weak)) void *__dso_handle;
}