[Buildroot] [PATCH 1/1] trace-cmd: use pkg-config instead of python-config

[Romain Naour <romain.naour@openwide.fr>]

Hi,

Le 14/10/2013 08:58, Thomas Petazzoni a ?crit :
> Dear Romain Naour,
> 
> On Mon, 14 Oct 2013 00:26:54 +0200, Romain Naour wrote:
>>
>> Add missing python dependency.
>> Makefile use host's python-config, which seems breaks powerpc and arm build.
>> Replaces python-config with pkg-config.
>> Add pkg-config as dependency.
>>
>> Fixes:
>> http://autobuild.buildroot.net/results/980/980875810528ac1dee34b8c268d9b3c40b2e35ec/
>>
>> Signed-off-by: Romain Naour <romain.naour@openwide.fr>
> 
> Interesting, this looks simpler than what I have done.
> 
>> ---
>> Note: Makefile use swig which is not available in buildroot.
> 
> swig is definitely available, in package/swig/.

Ok, I missed it :/
Thanks.

> 
>>
>>  package/trace-cmd/Config.in                        |  2 ++
>>  ...e-use-pkg-config-instead-of-python-config.patch | 34 ++++++++++++++++++++++
>>  package/trace-cmd/trace-cmd.mk                     |  2 ++
>>  3 files changed, 38 insertions(+)
>>  create mode 100644 package/trace-cmd/trace-cmd-0001-Makefile-use-pkg-config-instead-of-python-config.patch
>>
>> diff --git a/package/trace-cmd/Config.in b/package/trace-cmd/Config.in
>> index 8d79304..96ed63a 100644
>> --- a/package/trace-cmd/Config.in
>> +++ b/package/trace-cmd/Config.in
>> @@ -2,6 +2,8 @@ config BR2_PACKAGE_TRACE_CMD
>>  	bool "trace-cmd"
>>  	depends on BR2_LARGEFILE
>>  	depends on BR2_TOOLCHAIN_HAS_THREADS
>> +	select BR2_PACKAGE_PYTHON
> 
> No, Python support is optional in trace-cmd. We should keep optional,
> by doing:
> 
> ifeq ($(BR2_PACKAGE_PYTHON),)
> TRACE_CMD_MAKE_FLAGS += -NO_PYTHON=1
> else
> TRACE_CMD_DEPENDENCIES += python
> endif

What about python3 ?
But python 2.7 seems to be good enough.

> 
>> +	select BR2_PACKAGE_PKG_CONFIG
> 
> No, this is wrong. The pkg-config you're using is not the target
> pkg-config, but the host pkg-config. There is no need to add a
> Config.in dependency for that.
> 
>> diff --git a/package/trace-cmd/trace-cmd.mk b/package/trace-cmd/trace-cmd.mk
>> index 7a750f9..cd6ba20 100644
>> --- a/package/trace-cmd/trace-cmd.mk
>> +++ b/package/trace-cmd/trace-cmd.mk
>> @@ -11,6 +11,8 @@ TRACE_CMD_INSTALL_STAGING = YES
>>  TRACE_CMD_LICENSE = GPLv2 LGPLv2.1
>>  TRACE_CMD_LICENSE_FILES = COPYING COPYING.LIB
>>
>> +TRACE_CMD_DEPENDENCIES = python pkg-config
> 
> Python dependency should be optional. The pkg-config dependency should
> be on host-pkg-config.

host-pkgconf ?

> 
> See also the patch set I had posted to fix the same issue (in a
> different way, which required changing python2 and python3 config
> scripts):
> 
>   http://patchwork.ozlabs.org/patch/279267/
>   http://patchwork.ozlabs.org/patch/279265/
>   http://patchwork.ozlabs.org/patch/279269/
> 

I see that, my patch is a workaround and don't fix the real problem.
But we can decide to not use python-config for cross-compilation.

May I reuse your patch comments for v2 ?

Thanks for your support.

Best regards,
Romain

> Best regards,
> 
> Thomas
>