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emscripten遇到warning: unresolved symbol: ***funcName*** #2

@fanmingfei

Description

@fanmingfei

运行

 emcc -s WASM=1 -O3 -o program.js program.cpp --js-library library.js

返回

warning: unresolved symbol: _Z6funcNamev

program.js

#include <emscripten/emscripten.h>
#include <stack>

// 定义数组大小
#define N 100

// 防止 C++ 函数名被 Mangling
#ifdef _cplusplus
extern "C" {
#endif
    // 预置函数,暴露给 JS 进行处理
    extern void checku ();

    void EMSCRIPTEN_KEEPALIVE abc () {
        char a[] = "username";
        checku();
    }
#ifdef _cplusplus
}
#endif

library.js

mergeInto(LibraryManager.library, {
    checku: function() {
      console.log(123)
    }
});

笔误,踩了一个大坑。

#ifdef _cplusplus
extern "C" {
#endif

其实是 __cplusplus 前面两个下划线

#ifdef __cplusplus
extern "C" {
#endif

添加这个判断防止 C++ 函数名被 Mangling.

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