On 06/28/10 09:38 AM, Dag Sverre Seljebotn wrote:
Dr. David Kirkby wrote:
On some 64-bit platforms, which include, but is not limited to:
* Some version of OS X (I don't know what versions or processors)
* Solaris on SPARC processors.
* Solaris on x86 processors.
* OpenSolaris on SPARC processors.
* OpenSolaris on x86 processors.
* HP-UX on PA-RISC processors.
the default is to build 32-bit objects, but 64-bit objects can be created if
needed. This is usually done via adding the -m64 flag when compiling with GCC or
SunStudio, though the flag will be different with HP's compiler.
Numpy is used as part of Sage, but it would appear that adding -m64 to CFLAGS
will not work. A comment in the script used to build numpy shows:
First: Is Python built using -m64? If not, is there a reason that NumPy
in 64 bit and load it into 32 bit Python work? If Python is built with
-m64 I'd expect NumPy to pick it up automatically as it queries Python
for the build flags to use...
Yes, Python is built 64-bit, using the -m64 option.
# numpy's distutils is buggy and runs a conftest without
# taking CFLAGS into account. With 64 bit OSX this results
# in *boom*
it then goes on to copy a file called gcc_fake, which is basically a script
which gets renamed to gcc, but includes the -m64 flag.
We are using numpy-1.3.0.
Is this a known bug? If not, can I submit it to a bug database? Better still,
does anyone have a patch to resolve it - I hate the idea of making
Until somebody who really knows an answer chimes in;
AFAIK this is a "feature" in distutils itself, so it affects most Python
software. (Setting CFLAGS overwrites the necesarry CFLAGS settings, like
-fPIC and -fno-strict-aliasing, that is queried from Python). Try
setting "OPT" instead?
Dag Sverre
OPT has -m64 in it.
This is the bit that shows how Python is built on Solaris (uname=SunOS). SAGE64
will be set to "yes" for a 64-bit build.
OPT="-g -O3 -m64 -Wall -Wstrict-prototypes"; export OPT
./configure $EXTRAFLAGS --prefix="$SAGE_LOCAL" \
--enable-unicode=ucs4 --with-gcc="gcc -m64"
Many other parts of Sage seem to inherit the flags ok from Python, but not
numpy.
It is not a Solaris specific issue, as the same issue results on OS X.
Dave
Dave
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