Compiling a *.c source file using GCC v.s. MSC 2010(Microsoft Compiler)

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inline functions
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#ifdef _MSC_VER 
    #define INLINE __forceinline 
    /* use __forceinline (VC++ specific) */
#elif defined(__GNUC__)
   #define INLINE inline __attribute__((always_inline))
   /* use __attribute__((always_inline)) (GCC 4.3 latr) */
#else
   #define INLINE inline
   /*use standard inline*/
#endif

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local variable declaration
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/*GCC allows intermediately declaration*/
int function()
{
    int a = 3, b= 5, c;
    b++;
    a++;
    c = a * b;

    char buffer = (char)c + a + b; 
    //error C2143: syntax error : missing ';' before 'type'
    return buffer; 
    //error C2065: 'buffer' : undeclared identifier

}

/*In VC2010, all declaration must be put at the start of the function*/
int function()
{
    int a = 3, b= 5, c;
    char buffer;
    b++;
    a++;
    c = a * b;
  
    buffer = (char)c + a + b;
    return buffer;
}