[Bug c++/30470] Compiling C++ programs with -mno-80387 and -O3 failes

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from pinskia at gcc dot gnu dot org  2007-01-15 17:44 -------
>Well for starters why should the act of #include'ing stdlib.h cause any
> instructions to be emitted if strtold isn't even invoked?
Not really.

>However if the -mno-80387 option is meant to disable x87 instructions then it
> should be possible to build something without causing and x87 instructions to
> be emitted shouldn't it?

Yes and that means you can not use (or reference, even via a prototype) any
function that would cause x87 which is all functions which return a
float/double.

>The reason I want to disable the x87 is otherwise Signalling NaN's can get
> silently supressed being passed through the x87 unit. I didn't want that and
> wanted my SIGFPE's to be generated in some SSE code I had written.

You cannot without changing the ABI and changing the abi would mean you can't
do any thing.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30470