Re: [Qemu-devel] [PATCH] Makefile: Avoid explicit list of directories in clean target

[Eric Blake]

On 07/31/2012 08:19 AM, Markus Armbruster wrote:
> Peter Maydell <address@hidden> writes:
> 
>> Avoid having an explicit list of directories in the 'clean'
>> target by using 'find' to remove all .o and .d files instead.
>>

>>      rm -f qemu-options.def
>> -    rm -f *.o *.d *.a *.lo $(TOOLS) $(HELPERS-y) qemu-ga TAGS cscope.* 
>> *.pod *~ */*~
>> +    find . -name '*.[od]' | xargs rm -f
>> +    rm -f *.a *.lo $(TOOLS) $(HELPERS-y) qemu-ga TAGS cscope.* *.pod *~ */*~
> 
> Shit happens if you somehow manage to create a "mean" file name in the
> build tree.  Sure you don't want to -print0 | xargs -0?

Except that 'find -print0' and 'xargs -0' are both GNU extensions, not
available everywhere.  We may be requiring gmake and gcc, but are we
also requiring GNU find?

The POSIX way to write this, without relying on extensions, is:

find . -name '*.[od]' -exec rm -f {} +

(although then you get into the arguments of whether 'find -exec {} +'
is portable yet, even though it has now been required by POSIX for more
than 4 years.)

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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