Porting from GNU gcc* to Microsoft Visual C++*

On Linux* and OS X* systems, you can use the -diag-enable port-win option to alert you to general syntactical problems when porting an application from GNU gcc* to Microsoft Visual C++*. The following examples illustrate use of this option.

Example 1:

$ cat -n attribute.c
     1 int main()
     2 {
     3   int i __attribute__((unused));
     4   return 0;
     5 } 
$ icc -c -diag-enable port-win attribute.c 
attribute.c(3): warning #2133: attributes are a GNU extension
    int i __attribute__((unused));

Example 2:

$ cat -n state_expr.c
     1 int main()
     2 {
     3   int i = ({ int j; j = 1; j--; j;});
     4   return i;
     5 } 
$ icc -c -diag-enable port-win state_expr.c 
state_expr.c(3): warning #2132: statement expressions are a GNU extension
    int i = ({ int j; j = 1; j--; j;});