Re: Makefiles guidance

[Anmol Mishra]

Now, in Makefile.am Rules are a bit different than regular makefile?


On Fri, Jun 15, 2018 at 1:11 AM, Bob Friesenhahn <
address@hidden> wrote:

> On Fri, 15 Jun 2018, Anmol Mishra wrote:
>
> https://pastebin.com/gDiMCEpC
>>
>> https://github.com/Shopify/pyoozie/blob/master/Makefile
>>
>> What actually is my_cmd.python.2 and my_cmd.python.3 really do.
>> In these, What actually is happening in these lines?
>>
>>   1. python_version_full := $(wordlist 2,4,$(subst ., ,$(shell python
>>   --version 2>&1)))
>>   2. python_version_major := $(word 1,${python_version_full}
>>
>
> This is GNU make specific syntax (not portable) and so you should consult
> the GNU make manual.
>
> As a quick check you can add something this at the bottom of the Makefile
> to see what these variables end up being defined to:
>
> test_vars:
>         echo $(python_version_full)
>         echo $(python_version_major)
>
> and then do
>
> make test_vars
>
> to see what gets printed.
>
> Bob
> --
> Bob Friesenhahn
> address@hidden, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>



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