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;});
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