View Compilation Error

0_0_38586681_22638.cpp: In function 'int main()':
0_0_38586681_22638.cpp:17:29: error: invalid conversion from 'int (*)(const int*, const int*)' to 'int (*)(const void*, const void*)' [-fpermissive]
    qsort(a, i, sizeof(int), cmp);
                             ^~~
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/cstdlib:75,
                 from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/stdlib.h:36,
                 from 0_0_38586681_22638.cpp:2:
gcc-8.5.0/x86_64-w64-mingw32/include/stdlib.h:441:93: note:   initializing argument 4 of 'void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'
   void __cdecl qsort(void *_Base,size_t _NumOfElements,size_t _SizeOfElements,int (__cdecl *_PtFuncCompare)(const void *,const void *));
                                                                               ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~