Possible regression with CMake 2.8.6 RC2

[Michael Pyne]

Hi all,

Just writing to let you all know that a regression was reported by a Mageia 
user after CMake 2.8.6 rc2 was installed on his system.

kdelibs (4.7 branch, git) refused to link in kdecore/util based on this. The 
reason appears to be that -lpthread was not being used in the link command 
anymore. After some troubleshooting the user downgraded to 2.8.5 and reported 
that his kdelibs build completed successfully.

The CMakeLists.txt for kdelibs/kdecore has the following for the affected 
component starting from line 389:

if(NOT WIN32)                                                                   
    set(kdecore_LIB_SRCS ${kdecore_LIB_SRCS} util/kshareddatacache.cpp)         
    set(kdecore_OPTIONAL_LIBS ${kdecore_OPTIONAL_LIBS} \
                              ${CMAKE_THREAD_LIBS_INIT})
else(NOT WIN32) ...

Raphael Kubo da Costa mentioned that the only relevant change in CMake 
appeared to be from commit fd61be71401ef9e0a241562fc31539273084deff [1].

KSharedDataCache definitely requires pthreads at this point so if our current 
CMake-fu for utilizing that is wrong just let me know the right way to do it, 
otherwise I think this is a 2.8.6 regression.

[1] 
http://www.cmake.org/gitweb?p=cmake.git;a=commit;h=fd61be71401ef9e0a241562fc31539273084deff

Regards,
 - Michael Pyne
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