如何使用 Bazel 正确构建 JNI 动态库？ #338

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1. hsz0797 commented on Sep 15, 2025

   

   hsz0797

   on Sep 15, 2025

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   我自己尝试使用bazel构建动态库，测试的时候出现了找不到函数的问题java.lang.UnsatisfiedLinkError: 'long com.secretflow.pir.SecretFlowPirNativeUtils.BucketSenderMake(java.lang.String, java.lang.String, int, int, int, java.lang.String, boolean)'
2. huocun-ant commented on Sep 15, 2025

   

   huocun-ant

   on Sep 15, 2025

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   使用 cc_shared_library 试试，
   类似

   exports_files(
       [
           "exported_symbols.lds",
       ],
       visibility = ["//visibility:private"],
   )
   cc_shared_library(
       name = "shared",
       additional_linker_inputs = [
           ":exported_symbols.lds",
       ],
       shared_lib_name = "shared.so",
       user_link_flags = [
           "-Wl,--version-script=$(location :exported_symbols.lds)",
       ],
       deps = [":xxx"],
   )
   

   其中，exported_symbols.lds文件可以导出你想使用的接口函数名，类似：

   VERS_1.0 {
       global:
           c_func_*;
   };
   
3. hsz0797 commented on Sep 15, 2025

   

   hsz0797

   on Sep 15, 2025

   Last edited by hsz0797

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   试了一下，又有新问题，搞不明白了
   

   这是BUILD.bazel，exported_symbols.lds导出了想使用的接口函数名

   `# demo/src/main/jni/BUILD.bazel
   load("@rules_cc//cc:defs.bzl", "cc_library", "cc_binary")

   exports_files(["exported_symbols.lds"])

   cc_library(
   name = "jni_headers",
   hdrs = [
   "jni.h",
   "jni_md.h",
   ],
   includes = ["."],
   visibility = ["//visibility:public"],
   )

   cc_library(
   name = "yinyu_pir_native_lib",
   srcs = [
   "com_secretflow_pir_SecretFlowPirNativeUtils.cpp",
   ],
   hdrs = [
   "com_secretflow_pir_SecretFlowPirNativeUtils.h",
   ],
   includes = ["."],
   copts = [
   "-std=c++17",
   "-fPIC",
   ],
   deps = [
   ":jni_headers",
   "//psi/wrapper/apsi/api:sender_c_wrapper",
   "//psi/wrapper/apsi/api:receiver_c_wrapper",
   "//psi/wrapper/apsi/api:sender",
   "//psi/wrapper/apsi/api:receiver",
   "//psi/wrapper/apsi/api:wrapper_util",
   ],
   visibility = ["//visibility:public"],
   )

   cc_binary(
   name = "yinyu_pir_jni",
   deps = [
   ":yinyu_pir_native_lib",
   ],
   linkshared = 1,
   linkstatic = 0,
   additional_linker_inputs = [":exported_symbols.lds"],
   linkopts = [
   "-Wl,--version-script=$(location :exported_symbols.lds)",
   "-Wl,-rpath,$ORIGIN",
   ],
   data = [":exported_symbols.lds"],
   visibility = ["//visibility:public"],
   )
   `
4. huocun-ant commented on Sep 17, 2025

   

   huocun-ant

   on Sep 17, 2025

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   C++的函数签名会name mangle,如果是是Java想访问C++的函数，可以搞个C的header，也就是所有导出的函数使用extern "C" {} 包起来，可以网上搜一下标准写法，另外建议给这一组C 接口提供一个公共的前缀，这样方便导出，如果导出的接口中会包含C++的类作为参数，可以用void*暴露出去
5. huocun-ant commented on Sep 17, 2025

   

   huocun-ant

   on Sep 17, 2025

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   编译好的so可以使用命令 ldd -r xxx.so看看是不是需要别的so或者有unresolve的符号
6. huocun-ant commented on Sep 17, 2025

   

   huocun-ant

   on Sep 17, 2025

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   这个提示的符号可以使用如下命令查看：

   
7. wangzul

   assigned

   wangzul

   and

   huocun-ant

   on Sep 19, 2025