[Buildroot] [PATCHv2 4/4] toolchain: instrument external toolchain wrapper

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

On 2013-07-19 23:30 +0200, Peter Korsgaard spake thusly:
> >>>>> "Yann" == Yann E MORIN <yann.morin.1998@free.fr> writes:
>  >> You could argue that this feature isn't really needed as you can just
>  >> run 'strace -s 1000 -e execve <wrapper>' for basically the same
>  >> information, but OK - This is perhaps a bit more user friendly.
> 
>  Yann> My use-case was to see how the kernel build-system was calling the
>  Yann> wrapper. So I just ran:
>  Yann>     BR_DEBUG_WRAPPER=1 make
>  Yann> in my Buildroot build dir.
> 
> So you are only interested in the arguments to the wrapper, or do you
> want to see the final arguments to the real compiler?

No, I'm interested in the final, complete argv[*].

>  >> With that in mind, I think a more sensible output format is something
>  >> you can directly cut'n'paste and execute in the shell (after perhaps
>  >> tweaking something), so I've changed it to simply print the args space
>  >> seperated like this:
> 
>  Yann> Yet, one of the motivation behind the \n-separated args was to easily
>  Yann> see the args, without having to 'parse' the command line with the eyes.
> 
>  Yann> The Linux kernel is passing something like 40+ args to the wrapper, so
>  Yann> the line is getting rather long, and difficult to grok visually, while
>  Yann> the one-arg per line output made it very easy.
> 
> Ok, but a kernel build with 40+ lines per gcc invocation is presumably
> also quite overwhelming?

The trick is to wait it break, and re-run with BR_DEBUG_WRAPPER=1 set and
then inspect the reason for the breakage.

>  Yann> I already owed you one ${BEVERAGE} in Edimburgh; you can make
>  Yann> that two, now! ;-)
> 
> heh, sounds good ;)

Remember: for each ${BEVERAGE} I owe you, I get one too! :-)
/me is looking forward to it!

Regards,
Yann E. MORIN.

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software  Designer | \ / CAMPAIGN     |  ___               |
| +33 223 225 172 `------------.-------:  X  AGAINST      |  \e/  There is no  |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL    |   v   conspiracy.  |
'------------------------------^-------^------------------^--------------------'