[libvirt] wrong warning flags for clang

[Daniel P. Berrange]

On Sat, May 11, 2013 at 07:30:48PM +0400, Roman Bogorodskiy wrote:
> Appears that configure doesn't properly detect the case when clang is
> used instead of gcc:
> 
> CC=clang ./configure runs fine, but produces a long list of warning
> flags that clang doesn't support:
> 
> configure:     Warning Flags:  -W -Waddress -Wall -Warray-bounds
> -Wattributes -Wbad-function-cast ... trimmed ...
> 
> At some point, compilation fails:
> 
>   CC       libvirt_util_la-viralloc.lo
> clang: error: unknown warning option '-Wclobbered' [-Werror,-Wunknown-warning-option]
> clang: error: unknown warning option '-Wcoverage-mismatch'; did you mean '-Wpointer-type-mismatch'? [-Werror,-Wunknown-warning-option]
> 
> and many other similar errors.
> 
> Any idea what would be a proper fix for that?

clang annoyingly just ignores unknown warning flags by default causing
our flag detection code to fail. I'm working on a fix for this.


Daniel
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