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how to compile code on linux(32bit) for linux(64bit)


I am trying to create a shared library file of 64bit  for linux. but
the problem is i have to compile its source on 32 bit linux.

 i am using  option -m64 for the same but it  is not workig.

can anyone suggest me wht other option are availabe and also wht
option should be used for ld flags.

please reply soon

On 9 mei, 08:08, isanja@gmail.com wrote:

> I am trying to create a shared library file of 64bit  for linux. but
> the problem is i have to compile its source on 32 bit linux.

>  i am using  option -m64 for the same but it  is not workig.

> can anyone suggest me wht other option are availabe and also wht
> option should be used for ld flags.

> please reply soon

You will have to be specific about what cross-compiler you are using
as well as what the target platform is. Merely stating that the option
-m64
does not work is not enough.

Consider this:
- A lot of compilers will have no such option (they might call it
differently
  or do not have the facility at all)
- When a compiler running on Linux 32-bits does know how to compile
for
  "a" Linux 64-bits system, it will probably need to know what
processor
  this target system has.

Regards,

Arjen

> I am trying to create a shared library file of 64bit  for linux. but
> the problem is i have to compile its source on 32 bit linux.

> i am using  option -m64 for the same but it  is not workig.

It would help to know what compiler (or cross-compiler). While most
native compilers for x86_64 systems can generate 32bit code by using an
appropriate switch (-m32 being the switch for the GCC family), I don't
think that the other way around is true. You need either a) a 32bit
compiler with a working -m64 or b) a cross-compiler from 32bit to 64bit.

As you don't say what your compiler is, I'll just state what the
situation is for GCC (including gfortran). Option (b) is known to work
very well, but AFAIK there aren't any binaries for such compilers
provided, so you'll have to build your own (or find someone who would do
that for you). Option (a) was not possible a few months back, but I think
it is now working if you build your compiler yourself, and configure it
with the --enable-all-targets option. A bit of Google for this option and
asking the gcc-h@gcc.gnu.org mailing-list will probably get you there.

--
FX

In article <f1rtep$94@nef.ens.fr>, FX <coud@alussinan.org> wrote:
>It would help to know what compiler (or cross-compiler). While most
>native compilers for x86_64 systems can generate 32bit code by using an
>appropriate switch (-m32 being the switch for the GCC family), I don't
>think that the other way around is true.

The PathScale compilers can generate 64-bit code on a 32-bit system --
we ship a single 32-bit compiler used for both -- but your binutils on
your 32-bit system are unlikely to be up to the task of assembling the
resulting output.

-- greg

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