On Fri, May 19, 2017 at 11:07 AM, Denys Dmytriyenko <de...@denix.org> wrote:
> On Fri, May 19, 2017 at 01:37:59AM +0200, Enrico Scholz wrote:
>> Denys Dmytriyenko <de...@denix.org> writes:
>>
>> >> -EXTRA_OEMAKE += "cc=${CC}"
>> >> +EXTRA_OEMAKE += "cc='${CC}'"
>> >
>> > Should these be double-quotes around ${CC}?
>>
>> I wrote it in this way:
>>
>> - to 60%, because '' is more correct than "" in this context (see below)
>>
>> - to 40%, because "" would clutter code too much and I can not say
>> whether it must be quoted as \", \\" or whether perhaps plain " works
>> too
>
> FWIW, bitbake handles nested quotes properly, no escaping needed:
>
> +EXTRA_OEMAKE += "cc="${CC}""
>
>
>> A yet more correct solution would be
>>
>> | export cc = "${CC}"
>>
>> in the recipe (outside of do_*()) and perhaps adding '-e' to EXTRA_OEMAKE.
>>
>>
>> This handles additionally the case when 'CC' contains a single quote
>> (which causes misbehavior in my patch).
>>
>> Double quotes are much more worse because CC must not contain '$', '`'
>> or '\\' (which is not uncommon in flags like '-DFOO()=\"bar\"'). In OE,
>> it is not expected that these characters are interpreted directly by the
>> shell (${CC} is passed properly quoted in the environment).
>>
>> But all this does not matter... correct quoting is neglactted in OE and
>> bitbake; when you are lucky, commands are written as "foo '%s'" % path.
>> But nobody uses functions like 'pipes.quote()' or a non-shell variants
>> like subprocess.call(['foo', path]).
>>
>> So, you can assume that '${FOO}' expands to the same value like "${FOO}".
>
> Yes, bitbake variables will be expanded properly regardles of the quotes.
> Passing a shell variable may cause problems, but may not be a good practice
> in general.
you can toggle '' and "" strings, will keep the readability and embed
the string too
>
> --
> Denys
> --
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