[PATCH v2] wscript: Allow substitution outside values

[Sebastian Huber]

On 14/04/2022 09:01, Chris Johns wrote:
> On 14/4/2022 4:21 pm, Sebastian Huber wrote:
>> On 14/04/2022 04:19, Chris Johns wrote:
>>> On 14/4/2022 7:47 am, Kinsey Moore wrote:
>>>> This expands the ability to substitute variables outside the current
>>>> limitation of values in options to asflags, cflags, cppflags, cxxflags,
>>>> ldflags, and includes. It is possible for all of these flags to utilize
>>>> user-defined information in config.ini, especially for paths to external
>>>> resources.
>>> Is exposing access to cflags etc vis config.ini something we want to allow? It
>>> seems low level and I am not sure where it may lead up.
>> The patch allows you to use options in the flags, for example:
>>
>> cflags:
>> - -I${MY_HYPERVISOR_INCLUDE_PATH}
>>
>> It makes the build system more flexible with little extra code.
> Yes it does and I think this is useful however it also lets users set options
> that could break RTEMS or clash with the options we have specified and effect
> RTEMS is subtle or difficult to find ways.
> 
> A option that defined support for a hyper-visor provides some level of control
> we could verify.
> 
> I am not against this feature, I am just wondering what it ends up giving us and
> is it worth it?

This patch just adds the ability to use such options. If we want to add 
a particular option which uses this features is another topic. The 
options can perform custom verification steps defined by the option 
build item.

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