java - 如何将我的 SWIG 生成的库所依赖的这个 SWIG 生成的共享库用于搜索 dlsym？

Question

我使用的是 Ubuntu 16.04、g++ 5.4.0 和 CMake 3.5.1，但我在 macOS Mojave 上的结果与最新的 XCode 版本一致。

我有一个带有 SWIG 模块的程序 MyModule，它依赖于一个由一堆 C++ 库和它自己的 SWIG 模块 PSEngine 组成的系统。当我尝试运行加载 PSEngine 的 MyModule Java 程序时，我收到以下错误：

Exception in thread "main" java.lang.UnsatisfiedLinkError: psengine.PSEngineInterfaceJNI.swig_module_init()V
    at psengine.PSEngineInterfaceJNI.swig_module_init(Native Method)
    at psengine.PSEngineInterfaceJNI.<clinit>(PSEngineInterfaceJNI.java:356)
    at psengine.PSEngine.makeInstance(PSEngine.java:59)
    at MyModule.Main.main(Main.java:19)

最终，我的问题是：为什么 dlsym 不搜索libPSEngine_g.so符号，我怎样才能让它看起来在那里？我接下来的旅程和我尝试过的事情如下。

LD_LIBRARY_PATH指向包含 的目录libPSEngine_g.so，我使用 . 将同一目录传递给 Java -Djava.library.path。我通过在 处设置断点仔细检查了它正在寻找的符号dlsym，并确认它正在寻找的 C++ 符号是这样的：

Java_psengine_PSEngineInterfaceJNI_swig_1module_1init

该符号出现在libPSEngine_g.so：

$ nm libPSEngine_g.so | grep PSEngineInterfaceJNI_swig_1module
000000000005f2e1 T Java_psengine_PSEngineInterfaceJNI_swig_1module_1init

出于某种原因，libMyModule.so它不依赖于libPSEngine_g.so它应该依赖的系统中的任何其他非 SWIG C++ 库：

$ ldd libMyModule.so 
    linux-vdso.so.1 =>  (0x00007fffd56a9000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fa6b1d60000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fa6b1990000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fa6b1680000)
    /lib64/ld-linux-x86-64.so.2 (0x00007fa6b2400000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fa6b1450000)

这是 MyModule 中的初始链接条目CMakeLists.txt：

swig_link_libraries(${PROJECT}
  "PSEngine${EUROPA_SUFFIX}"
  "System${EUROPA_SUFFIX}"
  "Resource${EUROPA_SUFFIX}"
  "Solvers${EUROPA_SUFFIX}"
  "NDDL${EUROPA_SUFFIX}"
  "TemporalNetwork${EUROPA_SUFFIX}"
  "RulesEngine${EUROPA_SUFFIX}"
  "ConstraintEngine${EUROPA_SUFFIX}"
  "Utils${EUROPA_SUFFIX}"
  "TinyXml${EUROPA_SUFFIX}"
  )

起初我认为这是我在使用“较新”（不到 8 年的）链接器链接 SWIG 库时看到的一个问题，并且它不包括来自的符号，libPSEngine_g.so因为libMyModule.so实际上没有提到这些符号。我尝试强制它在链接中未定义，以诱使链接器定义符号：

swig_link_libraries(${PROJECT}
  "-Wl,-u,${PSENGINE_SYMBOL}"
  "PSEngine${EUROPA_SUFFIX}"
  "System${EUROPA_SUFFIX}"
  "Resource${EUROPA_SUFFIX}"
  "Solvers${EUROPA_SUFFIX}"
  "NDDL${EUROPA_SUFFIX}"
  "TemporalNetwork${EUROPA_SUFFIX}"
  "RulesEngine${EUROPA_SUFFIX}"
  "ConstraintEngine${EUROPA_SUFFIX}"
  "Utils${EUROPA_SUFFIX}"
  "TinyXml${EUROPA_SUFFIX}"
  )

但是，这只是在 中留下了未定义的符号libMyModule.so。那不是问题。一堆谷歌搜索出现了一堆可能的链接器选项，包括--no-as-needed,--export-dynamic和--no-copy-dt-needed-entries. 其中，产生我正在寻找的依赖的唯一一个是--no-as-needed：

swig_link_libraries(${PROJECT}
  "-Wl,--no-as-needed"
  "PSEngine${EUROPA_SUFFIX}"
  "System${EUROPA_SUFFIX}"
  "Resource${EUROPA_SUFFIX}"
  "Solvers${EUROPA_SUFFIX}"
  "NDDL${EUROPA_SUFFIX}"
  "TemporalNetwork${EUROPA_SUFFIX}"
  "RulesEngine${EUROPA_SUFFIX}"
  "ConstraintEngine${EUROPA_SUFFIX}"
  "Utils${EUROPA_SUFFIX}"
  "TinyXml${EUROPA_SUFFIX}"
  )

给我链接命令：

/usr/bin/c++  -fPIC   -shared  -o libMyProject.so CMakeFiles/MyProject.dir/MyProjectJAVA_wrap.cxx.o -Wl,--no-as-needed /home/miatauro/workspace/my_project/europa/dist/europa/libPSEngine_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libSystem_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libResource_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libSolvers_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libANML_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libNDDL_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libTemporalNetwork_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libRulesEngine_g.so /usr/local/lib/libantlr3c.so /home/miatauro/workspace/my_project/europa/dist/europa/libPlanDatabase_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libConstraintEngine_g.so /home/miatauro/workspace/my_project/europa/dist/europa/libUtils_g.so -ldl /home/miatauro/workspace/my_project/europa/dist/europa/libTinyXml_g.so -Wl,-rpath,/home/miatauro/workspace/my_project/europa/dist/europa:/usr/local/lib 

这会产生依赖项：

$ ldd libMyModule.so 
    linux-vdso.so.1 =>  (0x00007fffddb15000)
    /home/miatauro/workspace/my_project/europa/dist/europa/libPSEngine_g.so (0x00007f1f52720000)
    libSystem_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libSystem_g.so (0x00007f1f524f0000)
    libResource_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libResource_g.so (0x00007f1f51f47000)
    libSolvers_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libSolvers_g.so (0x00007f1f51b61000)
    libANML_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libANML_g.so (0x00007f1f517c0000)
    libNDDL_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libNDDL_g.so (0x00007f1f5142b000)
    libTemporalNetwork_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libTemporalNetwork_g.so (0x00007f1f5111a000)
    libRulesEngine_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libRulesEngine_g.so (0x00007f1f50e30000)
    libantlr3c.so => /usr/local/lib/libantlr3c.so (0x00007f1f50c10000)
    libPlanDatabase_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libPlanDatabase_g.so (0x00007f1f50692000)
    libConstraintEngine_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libConstraintEngine_g.so (0x00007f1f501f8000)
    libUtils_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libUtils_g.so (0x00007f1f4ff60000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f1f4fd30000)
    libTinyXml_g.so => /home/miatauro/workspace/my_project/europa/dist/europa/libTinyXml_g.so (0x00007f1f4fb10000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f1f4f780000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f1f4f460000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f1f4f240000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1f4ee70000)
/lib64/ld-linux-x86-64.so.2 (0x00007f1f52c00000)

依赖libPSEngine_g.so项与其他依赖项奇怪地不同，仅包含完整路径。

但是，这并不能解决查找问题，并且LD_DEBUG=all在我的环境中打开它在查找相关符号时会产生以下结果：

     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libSystem_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libANML_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libResource_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libSolvers_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libNDDL_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libTemporalNetwork_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libRulesEngine_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libPlanDatabase_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libConstraintEngine_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libUtils_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/home/miatauro/workspace/my_project/europa/dist/europa/libTinyXml_g.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/usr/lib/x86_64-linux-gnu/libstdc++.so.6 [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/lib/x86_64-linux-gnu/libgcc_s.so.1 [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/lib/x86_64-linux-gnu/libc.so.6 [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/usr/local/lib/libantlr3c.so [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/lib/x86_64-linux-gnu/libm.so.6 [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/lib/x86_64-linux-gnu/libdl.so.2 [0]
     18673: symbol=Java_psengine_PSEngineInterfaceJNI_swig_1module_1init;  lookup in file=/lib64/ld-linux-x86-64.so.2 [

libPSEngine_g.so根本没有出现在搜索中。加载命令的设置不会改变搜索顺序中的任何内容LD_PRELOAD。javalibPSEngine_g.so

我完全被难住了。StackOverflow，你的智慧是什么？

标签： javac++shared-librariesswigld