Detecting Structure Padding

I'm creating a header file (to be included in DLL projects) that allows DLLs to communicate with the larger, main application. The header file declares a struct, and I've figured that the structure must be packed to ensure that different compilers don't insert padding in different places, leading to a situation in which the application and the DLLs (built with different compilers) have separate views of the same struct definition.

However, different compilers have varying ways of indicating that a structure should be packed (VC++'s pragma directive as opposed to MingW's __attribute__); is there a way to detect which compiler is being used so the correct directive may be invoked?

For VC++ it is

Code:

---

#ifdef _MSC_VER
//Microsoft compiler
#endif

---

For gnu c/c++ it is

Code:

---

#ifdef __GNUC__
//GNU compiler
#endif

---

gg

Thanks. The information I found is as follows:

Microsoft VC++
_MSC_VER
#pragma pack(1) / #pragma pack(pop)

Borland C++
_BORLANDC_
#pragma pack(1) / #pragma pack()

GNU C++
__GNUC__
__attribute__((packed))