[LLVMbugs] [Bug 4476] New: cmake fails to find pthread_rwlock_init and pthread_getspecific using check_symbol_exists when they exists

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4476

           Summary: cmake fails to find pthread_rwlock_init and
                    pthread_getspecific using check_symbol_exists when they
                    exists
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: xerxes at zafena.se
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=3134)
 --> (http://llvm.org/bugs/attachment.cgi?id=3134)
workaround fix: change implementation from check_symbol_exists to
check_library_exists .patch

cd llvm
svn up
cd ..
mkdir llvm-build
cd llvm-build
cmake ../llvm
...
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
...
-- Looking for pthread_mutex_lock
-- Looking for pthread_mutex_lock - found
-- Looking for pthread_rwlock_init
-- Looking for pthread_rwlock_init - not found.
-- Looking for pthread_getspecific
-- Looking for pthread_getspecific - not found. 

The problem are that pthread_rwlock_init and pthread_getspecific are not found
on a system that should have them.

The attached patch includes a workaround that changes the implementation of
these tests to use check_library_exists instead of check_symbol_exists.
with this change the output from cmake are:

-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Looking for pthread_getspecific in pthread
-- Looking for pthread_getspecific in pthread - found
-- Looking for pthread_rwlock_init in pthread
-- Looking for pthread_rwlock_init in pthread - found
...
-- Looking for pthread_mutex_lock
-- Looking for pthread_mutex_lock - found 

There are one open cmake check_symbol_exists bugs on the cmake mantis
bugtracker this might be related:
http://www.cmake.org/Bug/view.php?id=8758 - CheckSymbolExists does not find a
symbol although it exists


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