[Tinkerphones] +++ next breakthrough for qtmoko2 +++

[H. Nikolaus Schaller]

Hi Jonas,

> Am 26.03.2018 um 13:17 schrieb Jonas Smedegaard <jonas at jones.dk>:
> 
> Quoting H. Nikolaus Schaller (2018-03-26 12:43:56)
>> Hi,
>> nobody with an idea or knowledge?
>> 
>> BR,
>> Nikolaus
>> 
>>> Am 18.03.2018 um 15:37 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>> 
>>> Another topic:
>>> 
>>> I am trying to build it on/for wheezy, but ./mkqtspec.sh fails with:
>>> 
>>>      dpkg-architecture: error: DEB_TARGET_ARCH is not a supported variable name
>>> 
>>> Jessie reports:
>>> 
>>> root at letux:# dpkg-architecture
>>> DEB_BUILD_ARCH=armhf
>>> DEB_BUILD_ARCH_BITS=32
>>> DEB_BUILD_ARCH_CPU=arm
>>> DEB_BUILD_ARCH_ENDIAN=little
>>> DEB_BUILD_ARCH_OS=linux
>>> DEB_BUILD_GNU_CPU=arm
>>> DEB_BUILD_GNU_SYSTEM=linux-gnueabihf
>>> DEB_BUILD_GNU_TYPE=arm-linux-gnueabihf
>>> DEB_BUILD_MULTIARCH=arm-linux-gnueabihf
>>> DEB_HOST_ARCH=armhf
>>> DEB_HOST_ARCH_BITS=32
>>> DEB_HOST_ARCH_CPU=arm
>>> DEB_HOST_ARCH_ENDIAN=little
>>> DEB_HOST_ARCH_OS=linux
>>> DEB_HOST_GNU_CPU=arm
>>> DEB_HOST_GNU_SYSTEM=linux-gnueabihf
>>> DEB_HOST_GNU_TYPE=arm-linux-gnueabihf
>>> DEB_HOST_MULTIARCH=arm-linux-gnueabihf
>>> DEB_TARGET_ARCH=armhf
>>> DEB_TARGET_ARCH_BITS=32
>>> DEB_TARGET_ARCH_CPU=arm
>>> DEB_TARGET_ARCH_ENDIAN=little
>>> DEB_TARGET_ARCH_OS=linux
>>> DEB_TARGET_GNU_CPU=arm
>>> DEB_TARGET_GNU_SYSTEM=linux-gnueabihf
>>> DEB_TARGET_GNU_TYPE=arm-linux-gnueabihf
>>> DEB_TARGET_MULTIARCH=arm-linux-gnueabihf
>>> root at letux:#
>>> 
>>> Wheezy reports:
>>> 
>>> root at letux:/# dpkg-architecture
>>> DEB_BUILD_ARCH=armhf
>>> DEB_BUILD_ARCH_BITS=32
>>> DEB_BUILD_ARCH_CPU=arm
>>> DEB_BUILD_ARCH_ENDIAN=little
>>> DEB_BUILD_ARCH_OS=linux
>>> DEB_BUILD_GNU_CPU=arm
>>> DEB_BUILD_GNU_SYSTEM=linux-gnueabihf
>>> DEB_BUILD_GNU_TYPE=arm-linux-gnueabihf
>>> DEB_BUILD_MULTIARCH=arm-linux-gnueabihf
>>> DEB_HOST_ARCH=armhf
>>> DEB_HOST_ARCH_BITS=32
>>> DEB_HOST_ARCH_CPU=arm
>>> DEB_HOST_ARCH_ENDIAN=little
>>> DEB_HOST_ARCH_OS=linux
>>> DEB_HOST_GNU_CPU=arm
>>> DEB_HOST_GNU_SYSTEM=linux-gnueabihf
>>> DEB_HOST_GNU_TYPE=arm-linux-gnueabihf
>>> DEB_HOST_MULTIARCH=arm-linux-gnueabihf
>>> root at letux:/#
>>> 
>>> So can we safely replace DEB_TARGET_ARCH by DEB_BUILD_ARCH
>>> in DEB_TARGET_ARCH=$(dpkg-architecture -qDEB_TARGET_ARCH) ?
> 
> "man dpkg-architecture" says:
> 
>> DEB_BUILD_ARCH
>>  The Debian architecture of the build machine.

ok.

> 
> and
> 
>> DEB_TARGET_ARCH
>>  The Debian architecture of the target machine (since dpkg 1.17.14).

ok. So we can use the same since the build is not a cross-build or anything.

> 
> dpkg version in wheezy is too old:
> https://packages.debian.org/source/oldoldstable/dpkg

Well, for building a package for wheezy it should never be too old...
Only some source code could be too new :)

> 
> If build machine is same architecture as target machine, then you can
> reuse, else not.

So does this mean the following?

* use DEB_TARGET_ARCH if defined
* fall back to DEB_BUILD_ARCH otherwise

I.e. replace it by:

DEB_TARGET_ARCH=$(dpkg-architecture -qDEB_TARGET_ARCH 2>/dev/null)
[ "$DEB_TARGET_ARCH" ] || DEB_TARGET_ARCH=$(dpkg-architecture -qDEB_BUILD_ARCH

BR and thanks,
Nikolaus

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