Re: [Xen-devel] [PATCH for-4.9] build: stubdom and tools should depend on public header target

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.05.17 at 16:51, <wei.liu2@xxxxxxxxxx> wrote:
> On Wed, May 17, 2017 at 08:28:40AM -0600, Jan Beulich wrote:
>> >>> On 17.05.17 at 16:20, <ian.jackson@xxxxxxxxxxxxx> wrote:
>> > Wei Liu writes ("Re: [PATCH for-4.9] build: stubdom and tools should 
>> > depend 
>> > on public header target"):
>> >> On Wed, May 17, 2017 at 02:16:39PM +0100, Ian Jackson wrote:
>> >> > The new code in the Makefiles LGTM.  I have only one nit, which is
>> >> > that style for Makefile targets seems to be to use `-' rather than `_'
>> >> > as a word separator.
>> >> 
>> >> IIRC at one point I used '-' in mini-os build system but some version of
>> >> make didn't like it. So I stick with '_' since.
>> > 
>> > I think you are confused.  You are probably thinking of variable names
>> > which cannot contain -.  (Well, which are troublesome if they do.)
>> 
>> Troublesome? I'm pretty sure we use such somewhere in the
>> hypervisor tree...
> 
> Then we'd better fix it sooner rather than later. :p

I'm afraid I would likely nak any such attempt.

> I dig out the patch. And this is in the commit message:
> 
>     In the GNU make manual "How to Use Variables" section there is such
>     word:
> 
>     "However, variable names containing characters other than letters,
>     numbers, and underscores should be considered carefully, as in some
>     shells they cannot be passed through the environment to a sub-make (see
>     Communicating Variables to a Sub-make)."

Which is fine. I'd never use such names for exported variables.
But for internally used ones they're quite fine (and easier to
type than ones using underscores).

As a side note - even ./Config.mk has such, so all subtrees
effectively use them one way or another.

Jan


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