[ltt-dev] Problem when compiling UST from git

[Mathieu Desnoyers]

* Pierre-Marc Fournier (pierre-marc.fournier at polymtl.ca) wrote:
> 
> 
> christian.charreyre at free.fr wrote:
> > Hello all,
> > 
> > I'm trying to use LTTng for kernelspace and userspace tracing.
> > 
> > I've success compiled kernel 2.6.32-rc8 with LTTng patches, libkcompat, userspace-rcu, all from git (http://git.dorsal.polymtl.ca/).
> > 
> > I can't compile UST picked at http://git.dorsal.polymtl.ca/?p=ust.git.
> > 
> > Precisely, after bootstraping and configuring, I get an error in file marker.c in libust, and the error is :
> > 
> > marker.c:1462: error: impossible constraint in ‘asm’
> > 
> > 
> > I'm working with gcc 4.4.1 from Ubuntu 9.10.
> > It seems that the asm behing __trace_mark can't be successfully compiled on my distro (macro _DEFINE_MARKER).
> > As I don't understand this asm directives, can anyone give me a hint so I can correct what is necessary to use UST.
> 
> Are you using a 32 bit arch? The git tree is currently broken for 32
> bits precisely because of this asm stuff. It is very high in my
> priorities to fix this.
> 
> You can temporarily fix this by simply removing the asm() and the
> save_registers() in _DEFINE_MARKER(). You don't need it, as it is only
> for gdb integration, which is not released yet. The asm is a trick to
> save the current code address.

pmf, you could probably work-around this issue by using a #ifdef to
define out this code for 32-bit x86 in the meantime so it works out of
the box for users.

Thanks,

Mathieu

> 
> Thanks.
> 
> pmf
> 
> > 
> > Thanks for answers.
> > 
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> > 
> 
> 
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-- 
Mathieu Desnoyers
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