On Tue, Apr 19, 2011 at 2:58 PM, Michal Marek <mmarek@xxxxxxx> wrote:
> On 19.4.2011 08:42, Haojian Zhuang wrote:
>> In scripts/setlocalversion under linux kernel tree, the scripts seems
>> a little strange.
> [...]
>> # append a plus sign if the repository is not in a clean
>> # annotated or signed tagged state (as git describe only
>> # looks at signed or annotated tags - git tag -a/-s) and
>> # LOCALVERSION= is not specified
>> if test "${LOCALVERSION+set}" != "set"; then
>> scm=$(scm_version --short)
>> res="$res${scm:++}"
>> fi
>> fi
>>
>> LOCALVERSION isn't assigned in any place. Only CONFIG_LOCALVERSION
>> can be assigned in .config file.
>> Why do we need to check LOCALVERSION at here?
>
> It can be set on the commandline:
>
> make LOCALVERSION=something
>
> Michal
>
Thanks a lot. It works.
I still have a question. I can't find the semantic of
${LOCALVERSION+set} in some
shell tutorials. Could you help me to figure out a link of introducing this?
Best Regards
Haojian
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