[libdispatch-dev] [PATCH] missing kqueue libs in testing/Makefile.am

Mark Heily mark at heily.com
Wed Nov 18 19:31:06 PST 2009

Paolo Bonzini wrote:
> On 11/18/2009 05:26 AM, Mark Heily wrote:
>> I believe that libkqueue r101 solves this problem by changing the output
>> of `pkg-config --libs` from this:
>>     -L${libdir} -lkqueue
>> to this:
>>      ${libdir}/libkqueue.la
> Does it actually make a difference?  libtool should look for the .la 
> file anyway, and now you've forced every libkqueue.pc client to use 
> libtool... :-)
> Paolo

Good question. The description of PKG_CHECK_MODULES Autoconf macro in the 
pkg-config manpage doesn't say anything about libtool [1]. Likewise, the 
libtool documentation doesn't say anything about pkg-config. I assumed that 
adding the .la file to the .pc file was the only way to get them to work 

However, you are correct that Libtool is smart enough to look for the .la 
file and use it instead of the output of `pkg-config --libs`. Thanks for 
pointing this out, and I have committed r102 that sets the pkg-config Libs 
variable to:

	Libs:  -L${libdir} -lpthread -lrt -lkqueue


   - Mark

[1] From pkg-config(1):


        The macro PKG_CHECK_MODULES can be used in configure.ac to check
        whether modules exist. A typical usage would be:
        PKG_CHECK_MODULES([MYSTUFF], [gtk+-2.0 >= 1.3.5 libxml = 1.8.4])

       This  would  result in MYSTUFF_LIBS and MYSTUFF_CFLAGS substitu-
       tion variables, set to the libs and cflags for the given  module

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