[cfe-dev] return statements without expressions in non-void functions revisited

[Eli Friedman]

On Mon, Jul 25, 2011 at 2:09 PM, Jack Howarth <howarth at bromo.med.uc.edu> wrote:
> On Mon, Jul 25, 2011 at 12:50:01PM -0700, Douglas Gregor wrote:
>>
>> On Jul 15, 2011, at 5:56 PM, Jack Howarth wrote:
>>
>> >   In porting texlive under clang for fink, we have run into the same issue from this thread...
>> >
>> > http://comments.gmane.org/gmane.comp.compilers.clang.devel/10688
>> >
>> > In that thread it was suggested that -std=c89 might be modified to convert the error into
>> > a warning for...
>> >
>> > [MacPro:~] howarth% clang -std=gnu89 -c type1_test.c -fno-strict-aliasing
>> > type1_test.c:24:8: error: non-void function 'PSFakePop' should return a value [-Wreturn-type]
>> >  else Error0("PSFakePop: Stack empty\n");
>> >       ^
>> > type1_test.c:13:54: note: instantiated from:
>> > #define Error0(errmsg) { CC; IfTrace0(TRUE, errmsg); Error;}
>> >                                                     ^
>> > type1_test.c:11:32: note: instantiated from:
>> > #define Error {errflag = TRUE; return;}
>> >                               ^
>> > 1 error generated.
>> >
>> > This appears to never have been implemented however. Any suggestions on the best approach to
>> > revise the following testcase to avoid the error under clang (which I also see under icc
>> > but not gcc trunk even with -std=c90)?
>>
>> The flag -Wno-error=return-type will downgrade this error to a warning. -Wno-return-type will turn off the warning/error entirely.
>>
>>       - Doug
>
> Doug,
>   Is there any documentation of the full set of warnings which are treated
> as errors that can be suppressed with -Wno-error in this manner?

There isn't a complete list anywhere (outside the source), but if
you're seeing some particular warning, and there is such a flag, it
will be listed after the warning (like -Wreturn-type is listed in the
given example).

-Eli