3.7.2 How You Can Use Diagnostic Suppression Options

The following example demonstrates how you can control diagnostic messages issued by the compiler. You control the linker diagnostic messages in a similar manner.

int one(); int I; int main() { switch (I){ case 1; return one (); break; default: return 0; break; } }

If you invoke the compiler with the --quiet option, this is the result:

"err.c", line 9: warning: statement is unreachable "err.c", line 12: warning: statement is unreachable

Because it is standard programming practice to include break statements at the end of each case arm to avoid the fall-through condition, these warnings can be ignored. Using the --display_error_number option, you can find out the diagnostic identifier for these warnings. Here is the result:

[err.c] "err.c", line 9: warning #111-D: statement is unreachable "err.c", line 12: warning #111-D: statement is unreachable

Next, you can use the diagnostic identifier of 111 as the argument to the --diag_remark option to treat this warning as a remark. This compilation now produces no diagnostic messages (because remarks are disabled by default).

NOTE

You can suppress any non-fatal errors, but be careful to make sure you only suppress diagnostic messages that you understand and are known not to affect the correctness of your program.