warnings missed by gcc and found by clang (patch included)

[Blas_Rodriguez_Somoz]

Hello

I've found nine warnings missed by gcc which appear when compiling with clang.
I attach a diff file which also include the patch for the test_concurrent_vector bug mentioned in a previous thread.

• file:include/tbb/internal/_concurrent_unordered_impl.h
  • 2 Wunused-parameter.
  • 1 Wconstant-conversion. This warning depends on how the compiler works, so I add a check for clang and a ignore pragma
• file:src/tbbmalloc/backend.cpp
  • 4 Wparentheses (assignment which also gives a boolean expression)
• file:src/test/test_buffer_node.cpp
  
  • 1 Wunused-parameter
• file:src/test/test_concurrent_vector.cpp
  • 1 Wtautological-comparison (the bug previously mentioned)
• file:src/test/test_queue_node.cpp
  
  • 1 Wunused-parameter

[Anton_M_Intel]

Hello, thank you! Could you please submit it viaMake a Contributionform?

[Blas_Rodriguez_Somoz]

Excuse me, I remember there is a way to submit contribution files but I don't find how, so I did it in the easy way.
I've submitted the file, and another two I've attached in the thread "Successful build with clang", through the contribution form.