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/usr/share/cmake-3.5/Modules/Compiler/XL-C.cmake is in cmake-data 3.5.1-1ubuntu1.

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include(Compiler/XL)
__compiler_xl(C)
set(CMAKE_C_FLAGS_RELEASE_INIT "${CMAKE_C_FLAGS_RELEASE_INIT} -DNDEBUG")
set(CMAKE_C_FLAGS_MINSIZEREL_INIT "${CMAKE_C_FLAGS_MINSIZEREL_INIT} -DNDEBUG")

# -qthreaded     = Ensures that all optimizations will be thread-safe
# -qhalt=e       = Halt on error messages (rather than just severe errors)
set(CMAKE_C_FLAGS_INIT "-qthreaded -qhalt=e")