stubs.c

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#include <stdint.h>
#include <intrin.h>
#include <malloc.h>
#define _USE_MATH_DEFINES
#include <math.h>
 
// atexit is needed by libsupc++
extern int __cdecl _crt_atexit(void (__cdecl*)(void));
int __cdecl atexit(void (__cdecl* function)(void))
{
    return _crt_atexit(function);
}
 
void* __cdecl operator_new(size_t size)
{
    return malloc(size);
}
 
void _cdecl operator_delete(void *mem)
{
    free(mem);
}
 
#ifdef _M_IX86
void _chkesp_failed(void)
{
    __debugbreak();
}
#endif
 
int __cdecl __acrt_initialize_sse2(void)
{
    return 0;
}
 
// The following stubs cannot be implemented as stubs by spec2def, because they are intrinsics
 
#ifdef _MSC_VER
#pragma warning(disable:4163) // not available as an intrinsic function
#pragma warning(disable:4164) // intrinsic function not declared
#pragma function(fma)
#pragma function(fmaf)
#pragma function(log2)
#pragma function(log2f)
#pragma function(lrint)
#pragma function(lrintf)
#endif
 
double fma(double x, double y, double z)
{
    // Simplistic implementation
    return (x * y) + z;
}
 
float fmaf(float x, float y, float z)
{
    // Simplistic implementation
    return (x * y) + z;
}
 
double log2(double x)
{
    // Simplistic implementation: log2(x) = log(x) / log(2)
    return log(x) * M_LOG2E;
}
 
float log2f(float x)
{
    return (float)log2((double)x);
}
 
long int lrint(double x)
{
    __debugbreak();
    return 0;
}
 
long int lrintf(float x)
{
    __debugbreak();
    return 0;
}