On Dez 12 2017, Segher Boessenkool <seg...@kernel.crashing.org> wrote:
> On Mon, Dec 11, 2017 at 03:57:51PM -0500, Michael Meissner wrote:
>> > > +extern KCtype __divkc3 (KFtype, KFtype, KFtype, KFtype);
>> > > +
>> > > KCtype
>> > > __divkc3 (KFtype a, KFtype b, KFtype c, KFtype d)
>> > > {
>> >
>> > How does this warn? -Wmissing-declarations? Should this declaration be
>> > in a header then?
>>
>> The compiler creates the call to __mulkc3 and __divkc3, and internally it has
>> the appropriate prototype like it does for all built-in functions (in this
>> case, returning an _Float128 _Complex type, and taking 4 _Float128
>> arguments).
>>
>> So before adding ifunc support, we never noticed it didn't have a prototype,
>> because the compiler already has a prototype.
>
> I still don't get it. A function definition is also a declaration.
>
> Something very non-intuitive is happening?
`-Wmissing-prototypes (C and Objective-C only)'
Warn if a global function is defined without a previous prototype
declaration. This warning is issued even if the definition itself
provides a prototype.
Andreas.
--
Andreas Schwab, SUSE Labs, sch...@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
