Assembly symbol generation

[Katana Steel]

I wonder why; when I compile a C++ file with a header which looks like this:
#ifndef __headername_h
#define __headername_h 1

#ifdef __cplusplus

extern "C" void function1(int,char*,int);
extern "C" void function2(int,char*,int);

#endif

#endif

under x86 & x64 linux this creates the symbols (output from nm):
        U  function1
        U  function2
and using cygwin & mingw (x86) it creates these symbols (output from nm):
        U  _function1
        U  _function2

is there a good reason for this? 

As this is a minor hasle when writing the assembly functions
and it would be nice to know why.

best regards
Katana Steel
-- as life grows older, I gain experience.
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