Re: [RFC 01/19] kbuild: Fixes to rules for host-cshlib and host-cxxshlib

[Knut Omang]

On Tue, 2019-08-13 at 23:01 +0900, Masahiro Yamada wrote:
> On Tue, Aug 13, 2019 at 3:13 PM Knut Omang <knut.omang@xxxxxxxxxx> wrote:
> >
> > C++ libraries interfacing to C APIs might sometimes need some glue
> > logic more easily written in C.
> > Allow a C++ library to also contain 0 or more C objects.
> >
> > Also fix rules for both C and C++ shared libraries:
> > - C++ shared libraries depended on .c instead of .cc files
> > - Rules were referenced as -objs instead of the intended
> >   -cobjs and -cxxobjs following the pattern from hostprogs*.
> >
> > Signed-off-by: Knut Omang <knut.omang@xxxxxxxxxx>
> 
> 
> How is this patch related to the rest of this series?

This is just my (likely naive) way I to get what I had working 
using autotools in the Github version of KTF) translated into something 
comparable using kbuild only. We need to build a shared library consisting 
of a few C++ files and a very simple C file, and a couple of simple binaries, 
and the rule in there does seem to take .c files and subject them to the 
C++ compiler, which makes this difficult to achieve?

> This patch breaks GCC-plugins.
> Did you really compile-test this patch before the submission?

Sorry for my ignorance here:
I ran through the kernel build and installed the resulting kernel 
on a VM that I used to test this, if that's what you are asking 
about?

Do I need some unusual .config options or run a special make target 
to trigger the problem you see?

I used a recent Fedora config with default values for new options,
and ran the normal default make target (also with O=) and make selftests 
to test the patch itself.

Thanks,
Knut

> --
> Best Regards
> 
> Masahiro Yamada