[Buildroot] Python distutils.sysconfig values

[Buildroot] Python distutils.sysconfig values

[Zoltan Gyarmati]

Dear All,

i'm trying to enable the gpsd python module in Buildroot (currently it's
disabled, see package/gpsd/gpsd.mk line #25). The gpsd build system uses
scons, which in turn uses distutils.sysconfig to get the value of
various paramaters (like the compiler to use, etc) like this:

> vars = sysconfig.get_config_vars('CC', 'CXX', 'OPT', 'BASECFLAGS', 'CCSHARED', 'LDSHARED', 'SO', 'INCLUDEPY', 'LDFLAGS')

which apparently yields the following values:

> ['/usr/bin/gcc -pthread', '/usr/bin/g++ -pthread', '-DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes', '-fno-strict-aliasing', '-fPIC', '/usr/bin/gcc -pthread -shared -L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/lib -L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,-rpath,/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,--enable-new-dtags', '.so', '/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/include/python2.7', '-L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/lib -L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,-rpath,/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,--enable-new-dtags']


 Note that some of the variables related to the BR environment (like the
python include dir), while others (most importantly CC) are coming from
the host environment.
 Does anybody could offer a hint where to look to get
distutils.sysconfig to set all of these values correctly?

Thanks in advance,

-- 
Zoltan Gyarmati
https://zgyarmati.de

[Buildroot] Python distutils.sysconfig values

[Arnout Vandecappelle]

On 30-06-16 12:33, Zoltan Gyarmati wrote:
> Dear All,
> 
> i'm trying to enable the gpsd python module in Buildroot (currently it's
> disabled, see package/gpsd/gpsd.mk line #25). The gpsd build system uses
> scons, which in turn uses distutils.sysconfig to get the value of
> various paramaters (like the compiler to use, etc) like this:
> 
>> vars = sysconfig.get_config_vars('CC', 'CXX', 'OPT', 'BASECFLAGS', 'CCSHARED', 'LDSHARED', 'SO', 'INCLUDEPY', 'LDFLAGS')
> 
> which apparently yields the following values:
> 
>> ['/usr/bin/gcc -pthread', '/usr/bin/g++ -pthread', '-DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes', '-fno-strict-aliasing', '-fPIC', '/usr/bin/gcc -pthread -shared -L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/lib -L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,-rpath,/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,--enable-new-dtags', '.so', '/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/include/python2.7', '-L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/lib -L/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,-rpath,/home/zgyarmati/projects/buildroot-upstream/buildroot/output/host/usr/lib -Wl,--enable-new-dtags']
> 
> 
>  Note that some of the variables related to the BR environment (like the
> python include dir), while others (most importantly CC) are coming from
> the host environment.
>  Does anybody could offer a hint where to look to get
> distutils.sysconfig to set all of these values correctly?

 You need to pass $(TARGET_CONFIGURE_OPTS) in the environment to set everything
correctly. gpsd does this:

GPSD_SCONS_ENV = $(TARGET_CONFIGURE_OPTS)


 Regards,
 Arnout


-- 
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
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