compiler-warnings

It is considered good practice to enable GHC warnings with -Wall . However, I've found out that fixing those warnings has a negative effect for some types of code constructs. Example 1: Using the do-notation equivalent of f >> will generate a warning if I don't explicitly use the _ <- f form: Warning: A do-notation statement discarded a result of type Char. Suppress this warning by saying "_ <- f", or by using the flag -fno-warn-unused-do-bind I understand that I can forget to do something with the result of f . However, it is legitimate to ignore the result (very common in parsers). There is

I'm getting this warning on a stack variable: warning: object.member may be used uninitialized in this function In this case I do not wish to force initialization to just to get rid of the warning as it consumes CPU cycles. The variable is a POD structure so a memset on it is not zero cost. I can verify that the variable is never used uninitialized, so I'd just like to suppress the warning for it. In general I do want the warning, just not on this particular variable in this particular scenario. How can I suppress the warning? Looks like the pragma diagnostics are the correct way to go but

I have existing code which use org.json.JSONObject 's Iterator JSONObject obj = new JSONObject(); obj.put("key1", "value1"); obj.put("key2", "value2"); Iterator keys = obj.keys(); ... With compile warning Iterator is a raw type. References to generic type Iterator<E> should be parameterized I can update to generic version: Iterator<?> keys = obj.keys(); But isn't there a way to "generify" JSONObject with String keys? I find this answer but its suggestion doesn't compiled JSONObject<String,Object> obj=new JSONObject<String,Object>(); EDIT Using Iterator<String> keys = obj.keys(); I'm getting a

I have a simple Entry object for populating a list public class Entry { //fields public Entry(int a, String b, String c) { //... } //some getters } and an AsyncTask that retrieves the entries. On its onProgressUpdate ... (here) | @Override V protected void onProgressUpdate(List<Entry>... param) { for (Entry e : param[0]) myAdapter.add(e); progressBar.incrementProgressBy(1); myAdapter.notifyDataSetChanged(); } I have the warning: Type safety: Potential heap pollution via varargs parameter param This happens on a PC Linux 64bit while the opposite warning is shown on a notebook with the same

I am using strlen function to get the length of unsigned char pointer. But VS compiler throws the following warning. unsigned char myString[] = "This is my string"; unsigned char* tmpBuffer = &myString[0]; size_t size = strlen(tmpBuffer); warning C4057: 'function' : 'const char *' differs in indirection to slightly different base types from 'unsigned char *' So what is the proper way to get unsigned char pointer size to get rid of the warning. strlen((const char*)tmpBuffer); Let you get rid of the note. Here you are typecasting it to the appropriate type that is being expected by the strlen()