Re: Problem with -mcpu option for GAS on Linux/Alpha

[Nick Clifton <nickc at redhat dot com>]

Hi Sergey,


> Am I right that ".arch" directive in a .s file has higher priority than 
> "-mcpu" command option.

Yes.

> The source file has inline assembler that adds some "ev56" instructions 
> Unfortunatelly, gcc 4.1 (gcc version 4.1.0 20051214 (Red Hat 4.1.0-0.8)) 
> adds ".arch ev5" into output assembler
> file and command line option is overwriten by in-file ".arch" directive.
> What should be correct behavior?

Add your own ".arch ev6" directive to the inline assembler just before 
the ev56 instructions are used.  (Ideally you would want to save the 
current architecture, switch to ev6, assemble the required instructions 
and then switch back.  But currently the Alpha port of GAS does not 
support anything like a .push_arch/.pop_arch pair of pseudos).

Better yet, move the inline assembler out into its own source file and 
assemble it independently of the rest of the program.  That way you 
should be able to ensure that the correct architecture is set from the 
command line and that you will not be attempting to assemble gcc 
generated code with the wrong architecture set.

Cheers
  Nick