[Xenomai] Compiling issue Xenomai 3.0 rc3

[Xenomai] Compiling issue Xenomai 3.0 rc3

[Michael Smith]

Hi. I'm having trouble compiling the newest release (Xenomai 3.0-rc3).
With the error

autotune.c: In function ‘main’:
autotune.c:298:16: error: ignoring return value of ‘daemon’, declared with
attribute warn_unused_result [-Werror=unused-result]
          daemon(0, 0);

Is there an way to override the -Werror flags so it doesn't break on
warnings without editing the make files?
Or is the policy on Xenomai to always compile cleanly without warnings.
Is this maybe my compilation method, but then again I did compile Xenomai
3.0-rc2 without an issue.
But I assume when a release is done it does compile cleanly.

Thanks
Michael

Re: [Xenomai] Compiling issue Xenomai 3.0 rc3

[Gilles Chanteperdrix]

On Thu, Feb 19, 2015 at 03:40:35PM +0200, Michael Smith wrote:
> Hi. I'm having trouble compiling the newest release (Xenomai 3.0-rc3).
> With the error
> 
> autotune.c: In function ‘main’:
> autotune.c:298:16: error: ignoring return value of ‘daemon’, declared with
> attribute warn_unused_result [-Werror=unused-result]
>           daemon(0, 0);
> 
> Is there an way to override the -Werror flags so it doesn't break on
> warnings without editing the make files?
> Or is the policy on Xenomai to always compile cleanly without warnings.
> Is this maybe my compilation method, but then again I did compile Xenomai
> 3.0-rc2 without an issue.
> But I assume when a release is done it does compile cleanly.

It compiles cleanly with the maintainer's compiler, which is not
necessarily the same as the one you are using.

Anyway, this is all my fault, this bug has already been signaled. I
said I would fix it, which obviously I did not.

-- 
					    Gilles.

Re: [Xenomai] Compiling issue Xenomai 3.0 rc3

[Huy Cong Vu]

----- Mail original -----
> De: "Michael Smith" <2michael.smith@gmail.com>
> À: xenomai@xenomai.org
> Envoyé: Jeudi 19 Février 2015 14:40:35
> Objet: [Xenomai] Compiling issue Xenomai 3.0 rc3

> Hi. I'm having trouble compiling the newest release (Xenomai 3.0-rc3).
> With the error
> 
> autotune.c: In function ‘main’:
> autotune.c:298:16: error: ignoring return value of ‘daemon’, declared with
> attribute warn_unused_result [-Werror=unused-result]
>          daemon(0, 0);

See: 
https://xenomai.org/pipermail/xenomai/2014-December/032690.html

> 
> Is there an way to override the -Werror flags so it doesn't break on
> warnings without editing the make files?
> Or is the policy on Xenomai to always compile cleanly without warnings.
> Is this maybe my compilation method, but then again I did compile Xenomai
> 3.0-rc2 without an issue.
> But I assume when a release is done it does compile cleanly.
> 
> Thanks
> Michael
> _______________________________________________
> Xenomai mailing list
> Xenomai@xenomai.org
> http://www.xenomai.org/mailman/listinfo/xenomai

-- 
Huy Cong
Wandercraft SAS

Re: [Xenomai] Compiling issue Xenomai 3.0 rc3

[Philippe Gerum]

On 02/19/2015 02:40 PM, Michael Smith wrote:
> Hi. I'm having trouble compiling the newest release (Xenomai 3.0-rc3).
> With the error
> 
> autotune.c: In function ‘main’:
> autotune.c:298:16: error: ignoring return value of ‘daemon’, declared with
> attribute warn_unused_result [-Werror=unused-result]
>           daemon(0, 0);
> 
> Is there an way to override the -Werror flags so it doesn't break on
> warnings without editing the make files?
> Or is the policy on Xenomai to always compile cleanly without warnings.

There is a strong policy to always compile without any warning. It
turned out that none of the libc headers I'm building against over 7 CPU
architectures sets the warn_unused_result attribute on the daemon()
routine yet.

-- 
Philippe.

Re: [Xenomai] Compiling issue Xenomai 3.0 rc3

[Philippe Gerum]

On 02/19/2015 03:16 PM, Philippe Gerum wrote:
> On 02/19/2015 02:40 PM, Michael Smith wrote:
>> Hi. I'm having trouble compiling the newest release (Xenomai 3.0-rc3).
>> With the error
>>
>> autotune.c: In function ‘main’:
>> autotune.c:298:16: error: ignoring return value of ‘daemon’, declared with
>> attribute warn_unused_result [-Werror=unused-result]
>>           daemon(0, 0);
>>
>> Is there an way to override the -Werror flags so it doesn't break on
>> warnings without editing the make files?
>> Or is the policy on Xenomai to always compile cleanly without warnings.
> 
> There is a strong policy to always compile without any warning. It
> turned out that none of the libc headers I'm building against over 7 CPU
> architectures sets the warn_unused_result attribute on the daemon()
> routine yet.
> 

The reason is due to a weak FORTIFY_LEVEL in some cases, others just
don't even plan for enabling __wur on daemon().

-- 
Philippe.

Re: [Xenomai] Compiling issue Xenomai 3.0 rc3

[Gilles Chanteperdrix]

On Thu, Feb 19, 2015 at 03:40:35PM +0200, Michael Smith wrote:
> Is this maybe my compilation method, but then again I did compile Xenomai
> 3.0-rc2 without an issue.

For the record: 3.0-rc2 had exactly the same issue. You probably did
not use the same toolchain, that is all.

-- 
					    Gilles.

Re: [Xenomai] Compiling issue Xenomai 3.0 rc3

[Michael Smith]

On Thu, Feb 19, 2015 at 4:23 PM, Gilles Chanteperdrix
<gilles.chanteperdrix@xenomai.org> wrote:
> On Thu, Feb 19, 2015 at 03:40:35PM +0200, Michael Smith wrote:
>> Is this maybe my compilation method, but then again I did compile Xenomai
>> 3.0-rc2 without an issue.
>
> For the record: 3.0-rc2 had exactly the same issue. You probably did
> not use the same toolchain, that is all.
>
> --
>                                             Gilles.

No in fact, I did not change my OS or compiler version (Ubuntu 14.04),
but it was compiled on different machines.
Might be that there was differences in default setups.
I updated the code to the newest git release and it compiles without issues.
Thanks all.

Michael