[Bug target/19379] [4.0 Regression] ICE during build of newlib's e_atan2.c when soft-float

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

------- Additional Comments From corsepiu at gcc dot gnu dot org  2005-01-12 10:30 -------
(In reply to comment #3)
> What do you want the ABI for soft-float to be?
> As RTEMS is probably the only user of -msoft-float, you get to choose.
-msoft-float basically is just a synomym for -no-80387 (-MASK_80387 in i386.h),
so there probably are more users.

> Do you want -msoft-float to imply -mno-fp-ret-in-387, do you want to supply
> it yourself, or do you want to admit that all shipping processors have an
> fpu and/or the os has an emulator?
Neither.

The actual problem is people using RTEMS on original i386dx's for whom previous
verions of gcc had required -mtune=i386 -mno-80387 -no-fp-ret-in-387 rsp.
-mcpu=i386 -msoft-float -no-fp-in-387.

For other cpus, coupling -msoft-float with -no-fp-in-387 has proven not to be
necessary.

This all is the reason for RTEMS gcc to use this kind of multilibs:
i386-rtems4.7-gcc --print-multi-lib
.;
m486;@mtune=i486
mpentium;@mtune=pentium
mpentiumpro;@mtune=pentiumpro
k6;@mtune=k6
athlon;@mtune=athlon
soft-float;@msoft-float
soft-float/nofp;@msoft-float@mno-fp-ret-in-387
m486/soft-float;@mtune=i486@msoft-float

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19379