[Buildroot] Segmentation fault while trying to remote debug with GDB and GDBServer

[Baruch Siach <baruch@tkos.co.il>]

Hi Oded,

On Sun, Mar 02, 2014 at 04:49:03PM +0000, Oded Hanson wrote:
> What about the include path when compiling from eclipse ? Any chance its 
> using my host include files ?

This should not happen.

> I can see that its using the cross compiler for sure,  but don't see where 
> the include path is set.

The cross gcc uses its sysroot as logical root directory for headers and 
libraries. Buildroot sets gcc sysroot to the staging directory. For the 
internal toolchain sysroot is defined at build time (see package/gcc/gcc.mk). 
For external toolchain sysroot is set on gcc command line by the external 
toolchain wrapper (see toolchain/toolchain-external/ext-toolchain-wrapper.c).

baruch

> On Mar 2, 2014 6:10 PM, Thomas Petazzoni 
> <thomas.petazzoni@free-electrons.com> wrote:
> Dear Oded Hanson,
> 
> (Adding M?lanie Bats in Cc, since she is responsible for the Eclipse
> plugin development)
> 
> On Sun, 2 Mar 2014 12:44:23 +0000, Oded Hanson wrote:
> 
> > For the completeness of the answer, I will add, that in eclipse plugin you 
> > can set the GDB command file. Pointing to a file with the set sysroot 
> > command in it, solves the issue also in eclipse and I can debug now from 
> > eclipse.
> >
> > I guess this should be fixed in the eclipse plugin setup.
> 
> The Eclipse plugin does set the solib-path (see
> https://github.com/mbats/eclipse-buildroot-toolchain-plugin/blob/master/org.buildroot.cdt.toolchain/src/org/buildroot/cdt/toolchain/BuildrootLaunchConfigurationTabGroup.java#L70),
> but that is apparently insufficient for gdb to find the correct dynamic
> linker, especially when the host and target architectures are identical.
> 
> Since there is apparently no way in Eclipse to set a gdb sysroot, I
> believe the only solution is for the Eclipse plugin to generate a
> simple gdbinit file:
> 
> set sysroot /path/to/staging/directory
> 
> and then instruct Eclipse to use it.
> 
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com

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