[oe] question on App bitsize - need the same as the kernel (multilib situation)

[Amy Fong]

On Tue, Mar 12, 2013 at 08:25:55PM -0700, Khem Raj wrote:
> 
> On Mar 12, 2013, at 8:13 PM, Amy Fong <amy.fong at windriver.com> wrote:
> 
> > It may be a combination of kernel ppc64 + userspace ppc (32);
> > or kernel x86-64 + userspace x86-32.
> 
> 
> I think you to ship ppc64 C runtime at least and same is true for x86_64
> and by bit size you mean machine word length right ? like sizeof(long)

Uhhhh no, what I mean is, 

e.g.

For userspace, if 32bit:
root at localhost:~# file /bin/bash
/bin/bash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.34, stripped

For kernel, if 64bit:
(in kernel config)
CONFIG_64BIT=y
# CONFIG_X86_32 is not set
CONFIG_X86_64=y
CONFIG_X86=y

Take for example, I want to run crash to do some kernel debugging, in this case,
I would want crash to be 64bits.

> > On Tue, Mar 12, 2013 at 03:41:29PM -0700, Khem Raj wrote:
> >> 
> >> On Mar 12, 2013, at 2:19 PM, Amy Fong <amy.fong at windriver.com> wrote:
> >> 
> >>> I need to build an application that has the same bitsize as the kernel. But in
> >>> my multilib configuration, the default usersapce bitsize is not the same as 
> >>> the kernel's bitsize. How do you do this?
> >> 
> >> which arch is this ?
> >> since generally we have one in multilib combo that matches kernel bit size
> >> but you might have left it out. 
> >> 
> >>> 
> >>> Thanks!
> >>> Amy
> >>> 
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> >> 
> >> 
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> 
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