buildozer + Cython + C ++库：dlopen失败：无法找到由module.so引用的符号符号名称

如何解决buildozer + Cython + C ++库：dlopen失败：无法找到由module.so引用的符号符号名称

phase_engine.so尝试使用_ZTINSt6__ndk18ios_base7failureE却找不到它：

11-08 19:59:00.629 25777 25823 I python  :  Traceback (most recent call last):
11-08 19:59:00.629 25777 25823 I python  :    File "/home/sonoflilit/phase/phase/.buildozer/android/app/main.py",line 14,in <module>
11-08 19:59:00.629 25777 25823 I python  :  ImportError: dlopen failed: cannot locate symbol "_ZTINSt6__ndk18ios_base7failureE" referenced by "/data/data/il.co.loris.phase/files/app/_python_bundle/site-packages/phase_engine.so"...
11-08 19:59:00.630 25777 25823 I python  : Python for android ended.

它存在于libc++_shared.so中：

apk$ readelf -s --wide lib/armeabi-v7a/libc++_shared.so | grep _ZTINSt6__ndk18ios_base7failureE
   690: 000885c0    12 OBJECT  GLOBAL DEFAULT   17 _ZTINSt6__ndk18ios_base7failureE

phase_engine.so没有动态链接

apk/assets$ readelf -a _python_bundle/site-packages/phase_engine.so | grep lib
 0x00000001 (NEEDED)                     Shared library: [libpython3.8m.so]
 0x00000001 (NEEDED)                     Shared library: [libdl.so]
 0x00000001 (NEEDED)                     Shared library: [libc.so]
  000000: Rev: 1  Flags: BASE  Index: 1  Cnt: 1  Name: build/lib.linux-x86_64-3.8/phase_engine.cpython-38-x86_64-linux-gnu.so
  000000: Version: 1  File: libc.so  Cnt: 1
  0x0020: Version: 1  File: libdl.so  Cnt: 1

尽管我很好地在libraries = ['c++'],中使用setup.py（肯定可以运行）：

from setuptools import setup,Extension
from Cython.Build import cythonize

setup(
    name = 'phase-engine',version = '0.1',ext_modules = cythonize([Extension("phase_engine",["phase_engine.pyx"] + ['music-synthesizer-for-android/src/' + p for p in [
            ...,'synth_unit.cc'
        ]],include_path = ['music-synthesizer-for-android/src/'],language = 'c++',libraries = ['c++'],)])
)

我在做什么错了？

解决方法

首先，c++当然应该是c++_shared，因为该库被称为libc++_shared.so。

第二，我无法使其与setup.py一起使用，但是很容易通过食谱将编译器标志添加到环境中，这就是numpy食谱的实现方式：

class MyRecipe(IncludedFilesBehaviour,CppCompiledComponentsPythonRecipe):
    version = 'stable'
    src_filename = "../../../phase-engine"
    name = 'phase-engine'

    depends = ['setuptools']

    call_hostpython_via_targetpython = False
    install_in_hostpython = True

    def get_recipe_env(self,arch):
        env = super().get_recipe_env(arch)
        env['LDFLAGS'] += ' -lc++_shared'
        return env

recipe = MyRecipe()