Re: [Xen-devel] [PATCH] autoconf: add missing compression checks for libxc

[Roger Pau Monnà <roger.pau@xxxxxxxxxxxxx>]

2012/3/6 Jan Beulich <JBeulich@xxxxxxxx>:
>>>> On 06.03.12 at 16:01, Roger Pau MonnÃ<roger.pau@xxxxxxxxxxxxx> wrote:
>> 2012/3/6 Jan Beulich <JBeulich@xxxxxxxx>:
>>> ... are you certain that checking for these symbols in the respective
>>> libraries suffices? The old check really was verifying corresponding
>>> header files' presence.
>>
>> I think it's best to do it this way, what this tests do is try to
>> compile a sample program that uses the library, which is much more
>> closer to the reality than just checking for a header existence. In a
>> strange case you might have the header files, but maybe the library is
>> broken, so we can not use it. What I can do if you want is check for
>> the header files also, something like this?
>
> Hmm, no - I was rather thinking of a real usability test (which implies
> existence), i.e. include the header in the test source snippet. This is
> what really matches reality.

The last patch does this more or less, it's just that not on the same
test. If headers are found and are usable then we perform a library
check, basically it does the same as the previous test found in
tools/libxc/Makefile but also checks that the library is usable for
linking.

> Jan

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