numpy-discussion

[Numpy-discussion] build errors Solaris x86 64 bit python2.5

[Mathew Y. <my...@jp...>]

yes, I got around the problem from my previous posting "distutils 
question". I added ld_args[:0] = ['-m64'] to line 209 of  
python2.5/distutils/unixcompiler.py. Lovely, yes I know.

I now get an error "numpy/core/src/multiarraymodule.c:7230: error: 
`NPY_ALLOW_THREADS' undeclared". This is after several billion warning 
messages of the form
numpy/core/src/multiarraymodule.c:5010: warning: dereferencing 
type-punned pointer will break strict-aliasing rules

Any help, suggestions gratefully accepted.

Mathew

Re: [Numpy-discussion] build errors Solaris x86 64 bit python2.5

[Charles R H. <cha...@gm...>]

On 10/26/06, Mathew Yeates <my...@jp...> wrote:
>
> yes, I got around the problem from my previous posting "distutils
> question". I added ld_args[:0] = ['-m64'] to line 209 of
> python2.5/distutils/unixcompiler.py. Lovely, yes I know.
>
> I now get an error "numpy/core/src/multiarraymodule.c:7230: error:
> `NPY_ALLOW_THREADS' undeclared". This is after several billion warning
> messages of the form
> numpy/core/src/multiarraymodule.c:5010: warning: dereferencing
> type-punned pointer will break strict-aliasing rules


GCC? Needs the -no-strict-aliasing flag. Everybody hates the default except
the compiler writers because you can't cast pointers between different sized
types, something the linux kernel and numpy do a lot. Things can fail badly
if you don't set the flag and ignore the warnings.

I don't know about the other warning, maybe some syntax error causing the
declaration to be missed.

Chuck

Re: [Numpy-discussion] build errors Solaris x86 64 bit python2.5

[Charles R H. <cha...@gm...>]

On 10/26/06, Charles R Harris <cha...@gm...> wrote:
>
>
>
> On 10/26/06, Mathew Yeates <my...@jp...> wrote:
> >
> > yes, I got around the problem from my previous posting "distutils
> > question". I added ld_args[:0] = ['-m64'] to line 209 of
> > python2.5/distutils/unixcompiler.py. Lovely, yes I know.
> >
> > I now get an error "numpy/core/src/multiarraymodule.c:7230: error:
> > `NPY_ALLOW_THREADS' undeclared". This is after several billion warning
> > messages of the form
> > numpy/core/src/multiarraymodule.c:5010: warning: dereferencing
> > type-punned pointer will break strict-aliasing rules
>
>
> GCC? Needs the -no-strict-aliasing flag. Everybody hates the default
> except the compiler writers because you can't cast pointers between
> different sized types, something the linux kernel and numpy do a lot. Things
> can fail badly if you don't set the flag and ignore the warnings.
>

Make that -fno-strict-aliasing. The whole command line on x86 looks like:

 gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic
-fasynchronous-unwind-tables -D_GNU_SOURCE -fPIC -fPIC

Chuck