[Numpy-discussion] numarray on Cygwin

Jochen Küpper jochen at unc.edu
Mon Aug 19 15:54:02 CDT 2002


Hi,

I could succesfully compile numarray (see numpy.org) on Cygwin
(updated last week), using the standard Cygwin python.  However many
tests fail, due to "missing" overflow or "division by zero"
exceptions.

I took a quick look at the test-failures of numarray on numpy. The
first problem is that we don't get a "Overflow error" warning when it
is expected:
,----[Cygwin]
| >>> array([1, 8, 100, 100], type=Int8) * array([1, 8, 100, -100], type=Int8)
| array([   1,   64,  127, -128], type=Int8)
`----

Whereas on Linux we get 
,----[Linux]
| >>> array([1, 8, 100, 100], type=Int8) * array([1, 8, 100, -100], type=Int8)
| Warning: Encountered overflow(s)  in multiply
| array([   1,   64,  127, -128], type=Int8)
`----

Is this related to a configuration option of python (--with-sigfpe ?)
or a "feature" of the Cygwin libm/libc?

Any ideas?


Btw, I tried to rebuild python (cvs maint22-release patched for
_socket) but got the following errors with the math module (similar
for cmath):
,----
| gcc -shared -Wl,--enable-auto-image-base build/temp.cygwin-1.3.12-i686-2.2/mathmodule.o -L/usr/local/lib -L. -lm -lpython2.2 -o build/lib.cygwin-1.3.12-i686-2.2/math.dll
| build/temp.cygwin-1.3.12-i686-2.2/mathmodule.o: In function `math_1':
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:57: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:57: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:57: undefined reference to `PyFPE_jbuf'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:57: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:59: undefined reference to `PyFPE_dummy'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:59: undefined reference to `PyFPE_counter'
| build/temp.cygwin-1.3.12-i686-2.2/mathmodule.o: In function `math_2':
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:74: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:74: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:74: undefined reference to `PyFPE_jbuf'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:74: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:76: undefined reference to `PyFPE_dummy'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:76: undefined reference to `PyFPE_counter'
| build/temp.cygwin-1.3.12-i686-2.2/mathmodule.o: In function `math_ldexp':
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:173: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:173: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:173: undefined reference to `PyFPE_jbuf'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:173: undefined reference to `PyFPE_counter'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:175: undefined reference to `PyFPE_dummy'
| /home/software/programming/compiler/python/dist/src/Modules/mathmodule.c:175: undefined reference to `PyFPE_counter'
| collect2: ld returned 1 exit status
| WARNING: building of extension "math" failed: command 'gcc' failed with exit status 1
`----

Greetings,
Jochen
-- 
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