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

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

------- Comment #6 from bugzilla at bennee dot com  2007-01-15 17:34 -------
(In reply to comment #5)
> and this is a bug why?
> 

Well for starters why should the act of #include'ing stdlib.h cause any
instructions to be emitted if strtold isn't even invoked?

I don't understand exactly what the relationship between the -O options and
-mno-80387 is. I got lost in a maze of glibc headers trying to work out exactly
what getting instantiated. As far as I can tell it boils down to (gccs?)
internal implementation of strtold.

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?

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.

Or does your question imply this is not gcc's problem but something in glibc?


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bugzilla at bennee dot com changed:

           What    |Removed                     |Added
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          Component|target                      |c++


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