Linking an assembly routine into a GCC project

(Sorry if this is a common topic or is in the wrong board ive tried searching to no solution)

I have the below assembly routine (computes e^X - 58 cpu clock cycles on an athalon - I would be impressed if someone could find a faster routine ) written in MASM syntax, and I no matter what I try I cannot manage to be able to use it from my C++ source.

I have declared:
-e_pwX PROTO : DWORD (In Assembly Source)
-PUBLIC e_pwX
&
-extern void e_pwX(FLOAT *); (In C++ Source)

And assembled the assembly source into a (COFF) object binary and included this file in the linker command line but when trying to compile I get this error:

[Linker error] undefined reference to `e_pwX(float *)'

My somewhat limited understanding of C++ doesn't help either but I will be grateful for any suggestions.

-Cheers



The routine:

Code:

e_pwX PROC C lpFloat: DWORD

fld [lpFloat]
sub     esp,16
fldl2e
fmul                                  ; z = x*log2(e)
fist    DWORD PTR [esp+12]            ; round(z)
fld1
fstp    TBYTE PTR [esp]
fisub   DWORD PTR [esp+12]            ; z - round(z)
mov     eax, [esp+12]
add     [esp+8],eax
f2xm1
fld1
fadd                                  ; 2^(z-round(z))
fld     TBYTE PTR [esp]               ; 2^(round(z))
fmul                                  ; 2^z = e^x
add     esp,16
fst [lpFloat]

ret
e_pwX ENDP

I haven't used any assembly code in gcc (or used masm style syntax, for that matter), but you could try declaring it as extern "C" instead of just regular extern. If it's C++, i think the function name will get mangled about in odd ways. If that doesn't solve it, i'm sorry :/

Cheers, using extern "C" worked a charm and now I everything compiles fine.

edit: n/m