Re: Failure building GSL-1.9 on FPU-less powerpc

[Sergei Poselenov <sposelenov@emcraft.com>]

Hello Brian,


Brian Gough wrote:
> At Thu, 23 Aug 2007 11:57:37 +0400,
> Sergei Poselenov wrote:
>> Investigation shows that the problem is that the "configure"
>> script chose the "gnuppc" IEEE arithmetic interface type by default,
>> which assume the FPU is present on the target and included
>> fp-gnuppc.c into the build.
>>
>> Then the compilation failed because fp-gnuppc.c tries to operate
>> the FPU hardware constants from fpu_control.h for FPU-aware
>> powerpcs; these constants are absent on my system.
>>
>> How can I build GSL?
> 
> You can comment out the HAVE_GNUPPC_IEEE_INTERFACE line in config.h to
> disable that part.
> 

Yes, thank you for the hint, I've finally came to something
similar - set "ac_cv_c_ieee_interface" to "no" prior to running
"configure". This selected "#include fp-gnuc99.c" in fp.c with
HAVE_DECL_FEENABLEEXCEPT defined on my system.

Don't you think the system-wide fpu-control.h for fpu-less
systems should have _FPU_RC_NEAREST and others defined for
compatibility? They already have there:

#define _FPU_GETCW(cw) 0
#define _FPU_SETCW(cw) do { } while (0)


Regards,
Sergei