[LLVMbugs] [Bug 22324] New: clang-3.6 thread sanitizer complains on shared_ptr operations

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat Jan 24 12:29:08 PST 2015


            Bug ID: 22324
           Summary: clang-3.6 thread sanitizer complains on shared_ptr
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mendola at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Compiling the code (using boost 1.54) here: 


$ clang++-3.6 -g main.cpp -lboost_system -lboost_thread -fsanitize=thread

it complains about the concurrent operation on two different instances of
shared_ptr pointing to the same int. 

Probably clang doesn't understand the homegrown atomic operations in 
sp_counted_base_gcc_x86.hpp (may because it use inline assembly?).

Compiling the same source with -DBOOST_SP_USE_PTHREADS then the warning

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