I'm using the Intel C++ 2024 Compiler in Visual Studio to make a DLL. I'm not encountering any compiler errors, but if I call sqrt() anywhere, the DLL silently fails when called by other programs. In other words, calling sqrt() is somehow stopping the function names from being exported properly (maybe interfering with the symbols, I'm not sure).
The problem is easy to reproduce. The following code will compile into a DLL using oneAPI in Visual Studio but you won't be able to call any of its exported functions from other programs. If you comment out the line with sqrt(), then the DLL will work properly:
#include <cmath>
#define EXPORT extern "C" __declspec(dllexport)
float some_function(float num) {
num = std::sqrt(num); //comment this out and the DLL works
return num;
}
EXPORT int this_should_return_4_but_it_doesnt() {
return 4;
}
Note that it's not just the function that calls sqrt() that will fail; every external function that the DLL should be exporting stops working, even functions that don't call sqrt().
Note that MSVC and GCC do not have this problem. They will compile the same code into a DLL and export functions without issues.
oneAPI can produce very efficient code (often better than MSVC and GCC) and I'd like to use it for DLLs but the inability to call sqrt() is extremely limiting.
Can you please let me know how to fix this problem?
