Re: Building Python with icc on 64-bit Linux

[Andrew MacIntyre]

Konrad Hinsen wrote:

/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ffi64.c(43): 
\

error: identifier "__int128_t" is undefined
__int128_t sse[MAX_SSE_REGS];
^
compilation aborted for 
/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libf\

fi/src/x86/ffi64.c (code 2)


That seems like a libffi configure failure (not properly handling 128bit
integers on this compiler/platform).


and failed test:

test test_cmath failed -- Traceback (most recent call last):
  File "/home/shr/khinsen/tmp/Python-2.6.2/Lib/test/test_cmath.py", line 
366, i\

n test_specific_values
self.fail(error_message)
AssertionError: acos: acos(complex(0.0, 0.0))
Expected: complex(1.5707963267948966, -0.0)
Received: complex(1.5707963267948966, 0.0)
Received value insufficiently close to expected value.


I've seen this on other compilers/platforms.  The floating point support 
in 2.6 is being more rigorously tested.  This compiler/platform/math lib

doesn't seem to be explicitly handling -0.0 as different from 0.0.
test_math has other similar failures.

Adding optimization yields even more failed tests. My configuration 
options are:


configure --prefix=$HOME CC=icc CXX=icc OPT=-O0

Did anyone encounter these problems before? Any solutions?


For the FP issues I wonder whether there's a compiler option that affects
how -0.0 is handled, or possibly a different math library?

The libffi issue would require delving into the libffi source and 
adjusting its configure script to properly handle the problematic case.

Unless you need ctypes, this may be something you can skip over...

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E-mail: andy...@bullseye.apana.org.au  (pref) | Snail: PO Box 370
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Building Python with icc on 64-bit Linux

[Konrad Hinsen]

I am trying to install Python 2.6.2 on a 64-bit Linux machine (RedHat  
Enterprise) using the Intel compiler (version 11). Even without  
optimizations (-O0), I get a compilation error in the ctypes module


icc -pthread -fPIC -fno-strict-aliasing -DNDEBUG -O0 -I. -I/home/shr/ 
khinsen/tm\
p/Python-2.6.2/./Include -Ibuild/temp.linux-x86_64-2.6/libffi/include  
-Ibuild/t\
emp.linux-x86_64-2.6/libffi -I/home/shr/khinsen/tmp/Python-2.6.2/ 
Modules/_ctype\
s/libffi/src -I. -IInclude -I./Include -I/usr/local/include -I/home/ 
shr/khinsen\
/tmp/Python-2.6.2/Include -I/home/shr/khinsen/tmp/Python-2.6.2 -c / 
home/shr/khi\
nsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ffi64.c -o build/ 
temp.linu\
x-x86_64-2.6/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/ 
src/x86/f\

fi64.o
/home/shr/khinsen/tmp/Python-2.6.2/Modules/_ctypes/libffi/src/x86/ 
ffi64.c(43): \

error: identifier "__int128_t" is undefined
__int128_t sse[MAX_SSE_REGS];
^
compilation aborted for /home/shr/khinsen/tmp/Python-2.6.2/Modules/ 
_ctypes/libf\

fi/src/x86/ffi64.c (code 2)


and failed test:

test test_cmath failed -- Traceback (most recent call last):
  File "/home/shr/khinsen/tmp/Python-2.6.2/Lib/test/test_cmath.py",  
line 366, i\

n test_specific_values
self.fail(error_message)
AssertionError: acos: acos(complex(0.0, 0.0))
Expected: complex(1.5707963267948966, -0.0)
Received: complex(1.5707963267948966, 0.0)
Received value insufficiently close to expected value.


Adding optimization yields even more failed tests. My configuration  
options are:


configure --prefix=$HOME CC=icc CXX=icc OPT=-O0

Did anyone encounter these problems before? Any solutions?

Thanks,
  Konrad.
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