[Buildroot] [PATCH] libcap-ng: disable_on_avr32

[Buildroot] [PATCH] libcap-ng: disable_on_avr32

[spdawson at gmail.com]

From: Simon Dawson <spdawson@gmail.com>

Thread-local storage is not available in the avr32 toolchain, so libcap-ng
must be disabled on avr32. Fixed build failures such as the following.

  http://autobuild.buildroot.net/results/05f/05f73cb74ee7bfb1c337100312726de034366a7d/

Signed-off-by: Simon Dawson <spdawson@gmail.com>
---
 package/libcap-ng/Config.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/libcap-ng/Config.in b/package/libcap-ng/Config.in
index d1663cd..008bf51 100644
--- a/package/libcap-ng/Config.in
+++ b/package/libcap-ng/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_LIBCAP_NG
 	bool "libcap-ng"
+	depends on !BR2_avr32 # TLS not available
 	help
 	  The libcap-ng library is intended to make programming with
 	  posix capabilities much easier than the traditional libcap
-- 
1.8.3.2

[Buildroot] [PATCH] libcap-ng: disable_on_avr32

[Thomas Petazzoni]

Simon,

On Sun,  3 Nov 2013 09:53:28 +0000, spdawson at gmail.com wrote:
> From: Simon Dawson <spdawson@gmail.com>
> 
> Thread-local storage is not available in the avr32 toolchain, so libcap-ng
> must be disabled on avr32. Fixed build failures such as the following.
> 
>   http://autobuild.buildroot.net/results/05f/05f73cb74ee7bfb1c337100312726de034366a7d/
> 
> Signed-off-by: Simon Dawson <spdawson@gmail.com>
> ---
>  package/libcap-ng/Config.in | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/package/libcap-ng/Config.in b/package/libcap-ng/Config.in
> index d1663cd..008bf51 100644
> --- a/package/libcap-ng/Config.in
> +++ b/package/libcap-ng/Config.in
> @@ -1,5 +1,6 @@
>  config BR2_PACKAGE_LIBCAP_NG
>  	bool "libcap-ng"
> +	depends on !BR2_avr32 # TLS not available
>  	help
>  	  The libcap-ng library is intended to make programming with
>  	  posix capabilities much easier than the traditional libcap

Thanks! I already sent a somewhat similar patch at
http://patchwork.ozlabs.org/patch/280889/, but Peter complained that
the problem was really related to the absence of TLS support rather
than AVR32, and that the TLS support could also be disabled on other
architectures using the BR2_GCC_ENABLE_TLS option. However, the problem
is that this option only exists for internal toolchains: for external
toolchains, we have absolutely no idea whether they have TLS support or
not.

My own point of view would be to remove the possibility of configuring
out TLS support, and simply assume TLS support is always enabled when
thread support is available. What do others think about this?

Also, you forgot to propagate the dependency to the 'ofono' package,
which selects libcap-ng.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] [PATCH] libcap-ng: disable_on_avr32

[Arnout Vandecappelle]

On 03/11/13 11:27, Thomas Petazzoni wrote:
> Simon,
>
> On Sun,  3 Nov 2013 09:53:28 +0000, spdawson at gmail.com wrote:
>> From: Simon Dawson <spdawson@gmail.com>
>>
>> Thread-local storage is not available in the avr32 toolchain, so libcap-ng
>> must be disabled on avr32. Fixed build failures such as the following.
>>
>>    http://autobuild.buildroot.net/results/05f/05f73cb74ee7bfb1c337100312726de034366a7d/
>>
>> Signed-off-by: Simon Dawson <spdawson@gmail.com>
>> ---
>>   package/libcap-ng/Config.in | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/package/libcap-ng/Config.in b/package/libcap-ng/Config.in
>> index d1663cd..008bf51 100644
>> --- a/package/libcap-ng/Config.in
>> +++ b/package/libcap-ng/Config.in
>> @@ -1,5 +1,6 @@
>>   config BR2_PACKAGE_LIBCAP_NG
>>   	bool "libcap-ng"
>> +	depends on !BR2_avr32 # TLS not available
>>   	help
>>   	  The libcap-ng library is intended to make programming with
>>   	  posix capabilities much easier than the traditional libcap
>
> Thanks! I already sent a somewhat similar patch at
> http://patchwork.ozlabs.org/patch/280889/, but Peter complained that
> the problem was really related to the absence of TLS support rather
> than AVR32, and that the TLS support could also be disabled on other
> architectures using the BR2_GCC_ENABLE_TLS option. However, the problem
> is that this option only exists for internal toolchains: for external
> toolchains, we have absolutely no idea whether they have TLS support or
> not.
>
> My own point of view would be to remove the possibility of configuring
> out TLS support, and simply assume TLS support is always enabled when
> thread support is available. What do others think about this?

  Fine by me.

  However, IIRC TLS is only available for NPTL, and this is not available 
for all architectures. So it is just moving the problem around.

  Regards,
  Arnout

>
> Also, you forgot to propagate the dependency to the 'ofono' package,
> which selects libcap-ng.
>
> Best regards,
>
> Thomas
>


-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
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