CMake and CMAKE_LD_FLAGS

[Alan Burlison]

hadoop-common-project/hadoop-common/src/JNIFlags.cmake sets the 
CMAKE_LD_FLAGS variable to the flags required for the linker. However, 
despite the name, CMAKE_LD_FLAGS is *not* a valid standard CMake 
variable, at least according to 
http://www.cmake.org/cmake/help/v3.0/manual/cmake-variables.7.html it 
isn't. I can't find any reference to CMAKE_LD_FLAGS in any of the 
standard CMake modules, so as far as I can tell the assignment in 
hadoop-common-project/hadoop-common/src/JNIFlags.cmake to CMAKE_LD_FLAGS 
isn't actually doing anything. I believe the correct variables are 
CMAKE_EXE_LINKER_FLAGS, CMAKE_SHARED_LINKER_FLAGS and 
CMAKE_STATIC_LINKER_FLAGS. However it's entirely possible I may be 
misunderstanding, does anyone know why CMAKE_LD_FLAGS has been used?

--
Alan Burlison
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