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  1.     #include <stdio.h>
  2.  
  3.     #include <gmp.h>
  4.  
  5.     extern "C" {
  6.       // SPOJ, codechef, ideone (64-bit)
  7.       const char* gmp_path = "/usr/lib64/libgmp.so.3";
  8.       void* __libc_dlopen_mode(const char* x, int y);
  9.       void* __libc_dlsym(void* x, const char* y);
  10.       #define DLOPEN __libc_dlopen_mode
  11.       #define DLSYM __libc_dlsym
  12.     }
  13.     void* p = DLOPEN(gmp_path, 2);
  14.      void* get(const char* name) { return DLSYM(p, name); }
  15.     int main() {
  16.        printf("%i", p == nullptr);
  17.        //const auto f = (decltype(mpz_init)*) get("__gmpz_init");
  18.        mpz_t v;
  19.        //f(v);
  20.       return 0;
  21.     }
  22.  
Success #stdin #stdout 0.01s 5276KB
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https://ideone.com/9BqBG5
language:
C++14 (gcc 8.3)
created:
44 days ago
visibility:
public

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