"mips" defined by gcc on little endian mips?

"mips" defined by gcc on little endian mips?

[Ross Vandegrift]

(please CC me on replies, I'm not subscribed)

Surprisingly (to me), this works on little endian mips:
  #include <stdio.h>
  
  int main(int argc, char *argv[])
  {
    printf("%d\n", mips);
  }

Disabling GNU extensions with -std restores expected behavior.  Tested with gcc
10.2 & 8.3 on debian sid & buster.  I couldn't find an obvious explanation in
the keyword index.  Is this behavior expected?  

Thanks,
Ross

Re: "mips" defined by gcc on little endian mips?

[Jonathan Wakely]

On Tue, 4 Aug 2020 at 07:20, Ross Vandegrift wrote:
>
> (please CC me on replies, I'm not subscribed)
>
> Surprisingly (to me), this works on little endian mips:
>   #include <stdio.h>
>
>   int main(int argc, char *argv[])
>   {
>     printf("%d\n", mips);
>   }
>
> Disabling GNU extensions with -std restores expected behavior.  Tested with gcc
> 10.2 & 8.3 on debian sid & buster.  I couldn't find an obvious explanation in
> the keyword index.  Is this behavior expected?

Yes, the example of "mips" is even covered explicitly in the documentation:
https://gcc.gnu.org/onlinedocs/cpp/System-specific-Predefined-Macros.html

Re: "mips" defined by gcc on little endian mips?

[Ross Vandegrift]

On Tue, Aug 04, 2020 at 07:57:06AM +0100, Jonathan Wakely wrote:
> On Tue, 4 Aug 2020 at 07:20, Ross Vandegrift wrote:
> > Disabling GNU extensions with -std restores expected behavior.  Tested with gcc
> > 10.2 & 8.3 on debian sid & buster.  I couldn't find an obvious explanation in
> > the keyword index.  Is this behavior expected?
> 
> Yes, the example of "mips" is even covered explicitly in the documentation:
> https://gcc.gnu.org/onlinedocs/cpp/System-specific-Predefined-Macros.html

Perfect, thanks for the pointer!

Ross