Stricter requirements for function main signature
Andrew Haley
aph@redhat.com
Tue Apr 8 14:56:00 GMT 2008
Ramon Bertran Monfort wrote:
> Well,
> first of all, thanks for answering.
>
>> Why don't you just define main() correctly? argv should be 'char **',
>> and envp should probably be 'char **'. How can you possibly have an
>> envp that's a long long unsigned int?
>
> If a follow the SDK3.0 programming guide, it tells me that the spe main
> function has three parameters: the spe id, and two pointers to application
> specific data. The last two are optional.
But you passed not a pointer but a long long unsigned int. Why not pass a
pointer instead of a long long unsigned int, especially since that's
what the programming guide tells you to do?
> I can try to change the signature to the 'correctly' one ... but doing this
> will break the spe run-time probably. (I've to experiment with this).
> Anyway, sometimes I use three parameters witch is not allowed with the
> 'correct' strict signature.
g++ allows the third argument to be a pointer.
> I know that there are workarounds for solving this issues, but I'm
> wondering if there is any gcc flag to relax this strict condition. It would
> be easy to port applications to gcc 4.3.0 such as the Cell application
> which changing the code is not as straightforward as the example shown in
> http://www.gnu.org/software/gcc/gcc-4.3/porting_to.html .
>> Also, what are the compiler options you're using?
>
> I guess that does not matter. I'm using just 'spu-g++ -O2' for testing.
Ah, OK. It seems that you have been caught by a version of gcc that treats
this as an error rather than a warning. I'm not sure exactly when this
changed, but the current development version has a warning, not an error.
Andrew.
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