Re: [kvm-unit-tests PATCH 1/7] x86: Makefile: Allow division on x86_64-elf binutils

[Roman Bolshakov <r.bolshakov@yadro.com>]

On Fri, Aug 28, 2020 at 07:00:19AM +0200, Thomas Huth wrote:
> On 10/08/2020 15.06, Roman Bolshakov wrote:
> > +
> > +COMMON_CFLAGS += -Wa,--divide
> 
> Some weeks ago, I also played with an elf cross compiler and came to the
> same conclusion, that we need this option there. Unfortunately, it does
> not work with clang:
> 
>  https://gitlab.com/huth/kvm-unit-tests/-/jobs/707986800#L1629
> 
> You could try to wrap it with "cc-option" instead ... or use a proper
> check in the configure script to detect whether it's needed or not.
> 

Hi Thomas,

I've wrapped it but clang can't deal with another option:
-Woverride-init

Even if I wrap it with cc-option and add wrapped clang's
-Winitializer-overrides, the build fails with:

x86/vmexit.c:577:5: error: no previous prototype for function 'main'
      [-Werror,-Wmissing-prototypes]
int main(int ac, char **av)
    ^
1 error generated.
<builtin>: recipe for target 'x86/vmexit.o' failed

I'm puzzled with this one.

CI log (ubuntu focal + clang 10):
https://travis-ci.com/github/roolebo/kvm-unit-tests/jobs/379561410

Now I wonder if wrong clang is used... Perhaps I should try
--cc=clang-10 in .travis.yml instead of --cc=clang.

Thanks,
Roman