Re: Testing for unknown flags in different compilers

[Eric Blake]

On 02/20/2014 08:12 AM, David A. Wheeler wrote:
> Thomas Jahns:
>> Also this is going to cause all sorts problems for compilers that use -W for
>> something else entirely, for example on PowerPC xlc has
>> -W<program>,<options_list>
>> so simply adding some arbitrary -Wsomecharactersequence might easily cause
>> catastrophic results later on.
> 
> I think that's the whole point of the macro; instead of just adding arbitrary 
> flags,
> it tests to make sure there are *not* catastrophic effects, but instead, that
> the flag is recognized.

Or at least has no observable negative effects even if it is a no-op to
a particular compiler by including the flag.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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