JNA加载库

Question

我有两个库,一个带有Ada对象,另一个带有C++对象(我没有很多控件可以在哪里找到)

Ada的东西引用了C的东西,反之亦然......

此符号位于libIPCAda.so中:ipc_manager_shutdown_c

此符号位于libIPCC.so中:stream_buffer_header_size

当我做这些JNA电话时:

   CLibrary INSTANCE8 = (CLibrary)
   Native.loadLibrary("IPCAda", //  <<< our library goes here
                      CLibrary.class);

   CLibrary INSTANCE9 = (CLibrary)
   Native.loadLibrary("IPCC", //  <<< our library goes here
                      CLibrary.class);

我明白了:

ld.so.1: java: fatal: relocation error: file <<my directory>>/lib/libIPCAda.so: symbol stream_buffer_header_size: referenced symbol not found

当我做这些JNA调用时:

   CLibrary INSTANCE9 = (CLibrary)
   Native.loadLibrary("IPCC", //  <<< our library goes here
                      CLibrary.class);

   CLibrary INSTANCE8 = (CLibrary)
   Native.loadLibrary("IPCAda", //  <<< our library goes here
                      CLibrary.class);

我明白了:

Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library 'IPCC': ld.so.1: java: fatal: relocation error: file <<my directory>>/lib/libIPCC.so: symbol ipc_manager_shutdown_c: referenced symbol not found
    at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:163)
    at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:236)
    at com.sun.jna.Library$Handler.<init>(Library.java:140)
    at com.sun.jna.Native.loadLibrary(Native.java:379)
    at com.sun.jna.Native.loadLibrary(Native.java:364)
    at Test2$CLibrary.<clinit>(Test2.java:55)
    at Test2.main(Test2.java:74)

显然它不喜欢交叉依赖符号......有没有办法让这个工作在JNA？

*编辑示例编译*

gcc -c -fPIC -g -O0 -fstack-check -pipe -gnatE -gnatU -gnatwl -gnatf -gnatE -gnat05 -lIPCC -I- -gnatA <<my directory>>src/ndds_c.adb

Answer 1

交叉链接将发生在native-code-land中,而不是Java中.据JNA所知,它正在加载两个完全独立的本机库.

您需要将库自己提供给彼此的位置.有几种方法可以做到这一点; 在编译共享库时设置rpath,或在运行时设置LD_LIBRARY_PATH环境变量.

Rpath可以说是更好的方法,因为它特定于需要它的二进制文件,并且不会污染运行时环境.您可以使用以下编译器标志在gcc中设置它:

-Lpath-to-your-library -Wl,-rpath,path-to-your-library