Help Compiling 64bit Python

[John Abel]

I'm having a bit of hassle, trying to compile Python in 64bit mode on
Solaris8, using GCC 3.1/3.3 (tried both). I've set the relevant
settings ( export CC="gcc -mcpu=v9 -m64 -D_LARGEFILE64_S OURCE=1" -
hopefully) before ./configure, which seems to work OK. The problem
happens halfway through the make. It produces the following output:

c++ -o python \
Modules/python.o \
libpython2.3.a -lresolv -lsocket -lnsl -lrt -ldl
-lpthread -lm
ld: fatal: file Modules/python.o: wrong ELF class: ELFCLASS64
ld: fatal: File processing errors. No output written to python
collect2: ld returned 1 exit status
make: *** [python] Error 1

I'd be very grateful for any pointers.

Regards

John

[Martin v. Löwis]

Re: Help Compiling 64bit Python

John Abel <john.abel@pa.p ress.net> writes:
[color=blue]
> c++ -o python \
> Modules/python.o \
> libpython2.3.a -lresolv -lsocket -lnsl -lrt -ldl
> -lpthread -lm
> ld: fatal: file Modules/python.o: wrong ELF class: ELFCLASS64
> ld: fatal: File processing errors. No output written to python
> collect2: ld returned 1 exit status
> make: *** [python] Error 1
>
> I'd be very grateful for any pointers.[/color]

You need to arrange to use the -m options in the linker line as well.

Looking at the generated Makefile will tell you where to best insert
these options.

Regards,
Martin

[John Abel]

Re: Help Compiling 64bit Python

Martin v. Löwis wrote:
[color=blue]
>John Abel <john.abel@pa.p ress.net> writes:
>
>
>[color=green]
>>c++ -o python \
>> Modules/python.o \
>> libpython2.3.a -lresolv -lsocket -lnsl -lrt -ldl
>>-lpthread -lm
>>ld: fatal: file Modules/python.o: wrong ELF class: ELFCLASS64
>>ld: fatal: File processing errors. No output written to python
>>collect2: ld returned 1 exit status
>>make: *** [python] Error 1
>>
>>I'd be very grateful for any pointers.
>>
>>[/color]
>
>You need to arrange to use the -m options in the linker line as well.
>
>Looking at the generated Makefile will tell you where to best insert
>these options.
>
>Regards,
>Martin
>
>[/color]
I seem to be missing something really obvious here. I've modified the
Makefile so it looks like this:

CONFIG_ARGS= 'CC=gcc -mcpu=v9 -m64 -D_LARGEFILE64_S OURCE=1'
'LDFLAGS=-mcpu=v9 -m64'

ran the make, and it still comes up with the same error. I've even
tried running it with LDFLAGS=-64, with the same result.

Regards

John

[Martin v. Löwis]

Re: Help Compiling 64bit Python

John Abel <john.abel@pa.p ress.net> writes:
[color=blue][color=green][color=darkred]
> >>c++ -o python \
> >> Modules/python.o \
> >> libpython2.3.a -lresolv -lsocket -lnsl -lrt -ldl
> >>-lpthread -lm[/color][/color][/color]
[...][color=blue]
> I seem to be missing something really obvious here. I've modified the
> Makefile so it looks like this:
>
> CONFIG_ARGS= 'CC=gcc -mcpu=v9 -m64 -D_LARGEFILE64_S OURCE=1'
> 'LDFLAGS=-mcpu=v9 -m64'
>
> ran the make, and it still comes up with the same error. I've even
> tried running it with LDFLAGS=-64, with the same result.[/color]

The really obvious thing you are missing is that "c++" is used to link
python, so setting "CC" has no effect.

I really encourage you to read the Makefile.

Regards,
Martin

[John Abel]

Re: Help Compiling 64bit Python

Martin v. Löwis wrote:
[color=blue]
>John Abel <john.abel@pa.p ress.net> writes:
>
>
>[color=green][color=darkred]
>>>>c++ -o python \
>>>> Modules/python.o \
>>>> libpython2.3.a -lresolv -lsocket -lnsl -lrt -ldl
>>>>-lpthread -lm
>>>>
>>>>[/color][/color]
>[...]
>
>[color=green]
>>I seem to be missing something really obvious here. I've modified the
>>Makefile so it looks like this:
>>
>>CONFIG_ARGS = 'CC=gcc -mcpu=v9 -m64 -D_LARGEFILE64_S OURCE=1'
>>'LDFLAGS=-mcpu=v9 -m64'
>>
>>ran the make, and it still comes up with the same error. I've even
>>tried running it with LDFLAGS=-64, with the same result.
>>
>>[/color]
>
>The really obvious thing you are missing is that "c++" is used to link
>python, so setting "CC" has no effect.
>
>I really encourage you to read the Makefile.
>
>Regards,
>Martin
>
>[/color]
Sorted. I ended up setting the following:

export CC="gcc -mcpu=v9 -m64 -D_LARGEFILE64_S OURCE=1"
export LDFLAGS='-mcpu=v9 -m64'
export LDDFLAGS='-mcpu=v9 -m64 -G'

Thanks to Martin for the pointers.

Regards

John