lkml.org 
[lkml]   [2014]   [Dec]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v5] selftest: size: Add size test for Linux kernel
From
Date
On Wed, 2014-12-03 at 08:29 -0800, Tim Bird wrote:
>
> On 12/02/2014 07:43 PM, Michael Ellerman wrote:
> > On Tue, 2014-12-02 at 19:36 -0800, Tim Bird wrote:
> >> This test shows the amount of memory used by the system.
> >> Note that this is dependent on the user-space that is loaded
> >> when this program runs. Optimally, this program would be
> >> run as the init program itself.
> >
> > Sorry to only chime in at v5.
> >
> >> diff --git a/tools/testing/selftests/size/Makefile b/tools/testing/selftests/size/Makefile
> >> new file mode 100644
> >> index 0000000..47f8e9c
> >> --- /dev/null
> >> +++ b/tools/testing/selftests/size/Makefile
> >> @@ -0,0 +1,15 @@
> >> +#ifndef CC
> >> + CC = $(CROSS_COMPILE)gcc
> >> +#endif
> >
> > I think the following is preferable:
> >
> > CC := $(CROSS_COMPILE)$(CC)
> >
> >
> > It allows optionally setting a custom CC, as well as optionally CROSS_COMPILE.
>
> I'm not sure I follow this.
>
> If CC is unset, you get only the CROSS_COMPILE prefix.

CC is never unset. The default value is 'cc'.

> If CC is set to e.g. 'gcc', then you get a nicely formatted toolchain string.

Right.

> But if CC already has the prefix applied, then this will result in
> having it duplicated, which surely won't work correctly.

That's just PEBKAC. Don't specify CROSS_COMPILE and also a fully specified CC.
Try it with the kernel Makefile and see how well it works.

> CROSS_COMPILE prefix usage looks a bit uncoordinated in the tools directory, but most
> tests seem to be favoring $(CROSS_COMPILE)gcc.

That doesn't make it right :)

>
> $ cd tools ; mgrep CROSS
...
> ./testing/selftests/powerpc/Makefile:CC := $(CROSS_COMPILE)$(CC)

You can run git blame on that one if you like ;)

> I agree it's desirable not to hardcode gcc, but we seem to be doing it all over
> the place already.

If everyone jumped off a bridge ... :)

cheers





\
 
 \ /
  Last update: 2014-12-04 01:41    [W:0.106 / U:4.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site