Upgrade "may not respond to" warning to error

Upgrade "may not respond to" warning to error

[Scott Lamb]

[-- Attachment #1: Type: text/plain, Size: 560 bytes --]

I'd like to have warnings like this:

     someFile.m:XXX:warning: `SomeObjcClass' may not respond to 
`-someMessage:'

become errors, while not affecting other warnings. So I have two 
questions:

1) What's the flag for this message? I see -Wundeclared-selector, but 
that seems to be a slightly different case.

2) Is it possible to do something like -Werror on just some warnings? 
I'd like some other types of warnings (say, the signedness ones) to be 
just warnings. I want to see them, but I don't want them to cause 
compilation to fail.

Thanks,
Scott

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 186 bytes --]

Re: Upgrade "may not respond to" warning to error

[Eljay Love-Jensen]

Hi Scott,

 >What's the flag for this message?

I'm not sure.  (I haven't familiarized myself with Objective-C.  Which is 
ironic, since I'm an OS X person.)

Refer to ...
http://gcc.gnu.org/onlinedocs/gcc-3.4.1/gcc/Objective-C-Dialect-Options.html
http://gcc.gnu.org/onlinedocs/gcc-3.4.1/gcc/Warning-Options.html

 >Is it possible to do something like -Werror on just some warnings?

No.  It's possible to doing something similar, using one of three different 
strategies:

1) edit the GCC source code and make the identified warnings 
errors.  Rebuild your custom GCC.

2) post-process the output (using sed, for instance) and "upgrade" warnings 
to errors.  Not quite the same thing, doesn't abort the compile, but may be 
"good enough".  You can use that in conjunction with grep to detect for the 
upgraded warnings, and abort a make file by returning a failing error code.

3) have your build process perform two passes.  The first pass enables all 
the warnings you want to see, the second pass enable only the warnings you 
want to be elevated to errors and turn on the -Werror flag.

Those are just a few ideas off the top of my head.

HTH,
--Eljay