gcov on target

gcov on target

[Robert Berger]

Hi,

I use Yocto Project, 1.3 "danny" for a beagle-xm and would like to show
kernel code coverage with a core-image-sato-sdk.
This image is pretty complete. Unfortunately there is no gcov available
on the target.

It looks like it's only built for the host.

Did someone manage to build/run gcov for an armv7a?
... or let's put it otherwise: Why doesn't it exist on the target?

Regards,

Robert...The most likely way for the world to be destroyed, most experts
agree, is by accident. That's where we come in; we're computer
professionals. We cause accidents.

My public pgp key is available,at:
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Re: gcov on target

[Thomas Petazzoni]

Dear Robert Berger,

On Fri, 11 Jan 2013 12:24:47 +0200, Robert Berger wrote:

> I use Yocto Project, 1.3 "danny" for a beagle-xm and would like to show
> kernel code coverage with a core-image-sato-sdk.
> This image is pretty complete. Unfortunately there is no gcov available
> on the target.
> 
> It looks like it's only built for the host.
> 
> Did someone manage to build/run gcov for an armv7a?
> ... or let's put it otherwise: Why doesn't it exist on the target?

I supposed the idea is to generate to coverage data on the target, and
then analyze them with gcov on the build machine. See
http://gcc.gnu.org/onlinedocs/gcc/Cross_002dprofiling.html#Cross_002dprofiling.

Best regards,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

Re: gcov on target

[Robert Berger]

Hi Thomas,

On 01/11/2013 06:19 PM, Thomas Petazzoni wrote:
>> Did someone manage to build/run gcov for an armv7a?
>> ... or let's put it otherwise: Why doesn't it exist on the target?
>
> I supposed the idea is to generate to coverage data on the target, and
> then analyze them with gcov on the build machine. See
>
http://gcc.gnu.org/onlinedocs/gcc/Cross_002dprofiling.html#Cross_002dprofiling.

Yes this should work. Thanks!
It's also documented in the kernel source tree [1].

>
> Best regards,
>
> Thomas
>

[1]:
http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=blob;f=Documentation/gcov.txt;h=e7ca6478cd93d4e6422d1ae92455b347dbdf7ccb;hb=HEAD

Regards,

Robert
..."About Basic: mentally mutilated potential programmers beyond hope of
regeneration." -- Dijkstra

My public pgp key is available,at:
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Re: gcov on target

[Robert Berger]

Hi,

After compiling with:

GCOV_PROFILE := y

I get:

insmod debugfs.ko
Error: could not insert module debugfs.ko: Invalid module format
unknown relocation: 38

Is this a known issue, or am I doing something stupid?

Regards,

Robert



..."In the beginning, there was software. And it wasn't good."

My public pgp key is available,at:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x90320BF1

Re: gcov on target

[Robert Berger]

Hi,

After compiling with:

GCOV_PROFILE := y

I get:

insmod debugfs.ko
Error: could not insert module debugfs.ko: Invalid module format
unknown relocation: 38

Is this a known issue, or am I doing something stupid?

Regards,

Robert



..."In the beginning, there was software. And it wasn't good."

My public pgp key is available,at:
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x90320BF1