[ptxdist] cross-compiling and uname

[ptxdist] cross-compiling and uname

[Michael Olbrich]

Hi,

we had some patches lately about configure scripts etc. using uname to
detect stuff. Why don't we create a fake ../sysroot-cross/bin/uname that
produces the output we would expect on the target?
This way we don't have to fix all those packages and we have on less source
of host system information leaking into the build.

Michael

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Re: [ptxdist] cross-compiling and uname

[Robert Schwebel]

On Thu, Jan 19, 2012 at 10:47:55PM +0100, Michael Olbrich wrote:
> we had some patches lately about configure scripts etc. using uname to
> detect stuff. Why don't we create a fake ../sysroot-cross/bin/uname
> that produces the output we would expect on the target?  This way we
> don't have to fix all those packages and we have on less source of
> host system information leaking into the build.

Are there any host tools which do also run uname? I'd prefer overwriting
cached variables or something like that.

rsc
-- 
Pengutronix e.K.                           |                             |
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Re: [ptxdist] cross-compiling and uname

[Michael Olbrich]

On Fri, Jan 20, 2012 at 06:30:49AM +0100, Robert Schwebel wrote:
> On Thu, Jan 19, 2012 at 10:47:55PM +0100, Michael Olbrich wrote:
> > we had some patches lately about configure scripts etc. using uname to
> > detect stuff. Why don't we create a fake ../sysroot-cross/bin/uname
> > that produces the output we would expect on the target?  This way we
> > don't have to fix all those packages and we have on less source of
> > host system information leaking into the build.
> 
> Are there any host tools which do also run uname? I'd prefer overwriting
> cached variables or something like that.

That's why I want to place it in sysroot-cross/bin. That's not in PATH for
hosttools.

Michael

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Pengutronix e.K.                           |                             |
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Re: [ptxdist] cross-compiling and uname

[Robert Schwebel]

On Fri, Jan 20, 2012 at 08:31:44AM +0100, Michael Olbrich wrote:
> On Fri, Jan 20, 2012 at 06:30:49AM +0100, Robert Schwebel wrote:
> > On Thu, Jan 19, 2012 at 10:47:55PM +0100, Michael Olbrich wrote:
> > > we had some patches lately about configure scripts etc. using
> > > uname to detect stuff. Why don't we create a fake
> > > ../sysroot-cross/bin/uname that produces the output we would
> > > expect on the target?  This way we don't have to fix all those
> > > packages and we have on less source of host system information
> > > leaking into the build.
> >
> > Are there any host tools which do also run uname? I'd prefer
> > overwriting cached variables or something like that.
>
> That's why I want to place it in sysroot-cross/bin. That's not in PATH
> for hosttools.

Hmm, I'm still not sure if this was side-effect free. However, leaving
it as it is will result in at least the same ammount of failures :-)

Marc, do you have an oppinion?

rsc
-- 
Pengutronix e.K.                           |                             |
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Re: [ptxdist] cross-compiling and uname

[Marc Kleine-Budde]

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On 01/20/2012 08:38 AM, Robert Schwebel wrote:
> On Fri, Jan 20, 2012 at 08:31:44AM +0100, Michael Olbrich wrote:
>> On Fri, Jan 20, 2012 at 06:30:49AM +0100, Robert Schwebel wrote:
>>> On Thu, Jan 19, 2012 at 10:47:55PM +0100, Michael Olbrich wrote:
>>>> we had some patches lately about configure scripts etc. using
>>>> uname to detect stuff. Why don't we create a fake
>>>> ../sysroot-cross/bin/uname that produces the output we would
>>>> expect on the target?  This way we don't have to fix all those
>>>> packages and we have on less source of host system information
>>>> leaking into the build.
>>>
>>> Are there any host tools which do also run uname? I'd prefer
>>> overwriting cached variables or something like that.
>>
>> That's why I want to place it in sysroot-cross/bin. That's not in PATH
>> for hosttools.
> 
> Hmm, I'm still not sure if this was side-effect free. However, leaving
> it as it is will result in at least the same ammount of failures :-)
> 
> Marc, do you have an oppinion?

We cannot overwrite uname, because even configure with --host and
--build uses uname:

$ strace -o log -e execve -f ./configure --host=x86_64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu
$ grep uname log
1610  execve("/bin/uname", ["uname", "-m"], [/* 51 vars */]) = 0
1612  execve("/bin/uname", ["uname", "-r"], [/* 51 vars */]) = 0
1614  execve("/bin/uname", ["uname", "-s"], [/* 51 vars */]) = 0
1616  execve("/bin/uname", ["uname", "-v"], [/* 51 vars */]) = 0
1618  execve("/usr/bin/uname", ["/usr/bin/uname", "-p"], [/* 51 vars */]) = -1 ENOENT (No such file or directory)
1620  execve("/bin/uname", ["/bin/uname", "-X"], [/* 51 vars */]) = 0

Marc

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Re: [ptxdist] cross-compiling and uname

[Juergen Beisert]

Michael Olbrich wrote:
> we had some patches lately about configure scripts etc. using uname to
> detect stuff. Why don't we create a fake ../sysroot-cross/bin/uname that
> produces the output we would expect on the target?

Please not! It would be a hack, not a solution!

jbe

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Re: [ptxdist] cross-compiling and uname

[Juergen Beisert]

Robert Schwebel wrote:
> On Fri, Jan 20, 2012 at 08:31:44AM +0100, Michael Olbrich wrote:
> > On Fri, Jan 20, 2012 at 06:30:49AM +0100, Robert Schwebel wrote:
> > > On Thu, Jan 19, 2012 at 10:47:55PM +0100, Michael Olbrich wrote:
> > > > we had some patches lately about configure scripts etc. using
> > > > uname to detect stuff. Why don't we create a fake
> > > > ../sysroot-cross/bin/uname that produces the output we would
> > > > expect on the target?  This way we don't have to fix all those
> > > > packages and we have on less source of host system information
> > > > leaking into the build.
> > >
> > > Are there any host tools which do also run uname? I'd prefer
> > > overwriting cached variables or something like that.
> >
> > That's why I want to place it in sysroot-cross/bin. That's not in PATH
> > for hosttools.
>
> Hmm, I'm still not sure if this was side-effect free. However, leaving
> it as it is will result in at least the same ammount of failures :-)
>
> Marc, do you have an oppinion?

The autotools already deliver the correct values for the build host and the 
target host.
The correct solution for these kind of failures in the buildsystem is to use 
the results of the autotools *correctly*.

jbe

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Re: [ptxdist] cross-compiling and uname

[Bernhard Walle]

Hi Michael,

Am 19.01.12 22:47, schrieb Michael Olbrich:
> 
> we had some patches lately about configure scripts etc. using uname to
> detect stuff. Why don't we create a fake ../sysroot-cross/bin/uname that
> produces the output we would expect on the target?
> This way we don't have to fix all those packages and we have on less source
> of host system information leaking into the build.

I agree with the others: Fixing the packages is the better solution in
my opinion. For the neon fix I'm trying to bring the patch upstream, so
that would be one patch less in the long term.

Especially as the absolute number of packages affected is quite low.
With the current git ptxdist (and one fix for the kernel and
module-init-tools I didn't post yet) and Andreas' OSELAS.Toolchain
patches I'm able to build a complete image for my weather station
receiver on
Mac OS. :)


Regards,
Bernhard

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