[Buildroot] [PATCH 8/8] utils/check-package: warn about overridden variables

[Yann E. MORIN <yann.morin.1998@free.fr>]

Ricardo, All,

On 2019-01-27 16:59 -0200, Ricardo Martincoski spake thusly:
> For the general case, appending values to variables is OK and also a
> good practice, like this:
> |PACKAGE_VAR = value1
> |ifeq ...
> |PACKAGE_VAR += value2
> 
> or this, when the above is not possible:
> |PACKAGE_VAR = value1
> |ifeq ...
> |PACKAGE_VAR := $(PACKAGE_VAR), value2
> 
> But this override is an error:
> |PACKAGE_VAR = value1
> |PACKAGE_VAR = value2
> 
> as well this one:
> |ifeq ...
> |PACKAGE_VAR += value1
> |endif
> |PACKAGE_VAR = value2
> 
> And this override is error-prone:
> |PACKAGE_VAR = value1
> |ifeq ...
> |PACKAGE_VAR = value2
> 
> Create a check function to warn about overridden variables.
> 
> Some variables are likely to have a default value that gets overridden
> in a conditional, so ignore them. The name of such variables end in
> _ARCH, _CPU, _SITE, _SOURCE or _VERSION.

Since I updated my host distribution to Ubuntu 19.04, flake8 now reports
tons of errors:

    ./utils/checkpackagelib/lib_mk.py:22:7: W605 invalid escape sequence '\s'

This is because Ubuntu has update pycodestyle to 2.4.0, which introduced
this new W605 check. It mandates that regexps be prefixed by an 'r'
(like a binary string be prefixed by a 'b'), like:

    r"^\s*#"

However, when I fix all these 82 new errors, and run check-package, I
now get a warning about overriden license lists in the few packages
where we do override the license, like in dtc:

    ifeq ($(BR2_PACKAGE_DTC_PROGRAMS),y)
    DTC_LICENSE := $(DTC_LICENSE), GPL-2.0+ (programs)
    [...]
    endif

However, as far as I understand the code, there is an explicit condition
that allows concatenating to a variable (the CONCATENATING regexp), now
line 127.

Do you have an idea what's going on now?

Regards,
Yann E. MORIN.

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