I just compiled and tested sage on a machine that I haven't run it on
before, and got the following puzzling error:
sage -t devel/sage-main/sage/rings/real_mpfr.pyx
**********************************************************************
File "real_mpfr.pyx", line 1471:
sage: RealField(5)(-pi).exact_rational()
Expected:
-25/8
Got:
1610612736
**********************************************************************
It works fine now, by which I mean, the test passes if I manually run
./sage -t devel/sage-main/sage/rings/real_mpfr.pyx
and the following also works correctly:
sage: RealField(5)(-pi)
-3.1
sage: RealField(5)(-pi).exact_rational()
-25/8
Perhaps the error indicates a hardware failure (this is an old, battered
laptop) but I thought I would report it anyway. For reference,
from /proc/cpuinfo:
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 6
model name : mobile AMD Athlon(tm) 4 1600+
stepping : 2
cpu MHz : 498.364
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips : 997.70
I'm running 'make test' again, and might try to do some hardware tests.
I'll send another email if anything funny comes up.
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