[mlpack-git] [mlpack/mlpack] Added test coverage framework (#720)

[Ryan Curtin]

> @@ -74,6 +74,34 @@ if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
>    set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -lm")
>  endif()
>  
> +# Setup build for test coverage
> +if(BUILD_WITH_COVERAGE)
> +  # Currently coverage only works with GNU g++
> +  if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
> +    # Find gcov and lcov
> +    find_program(GCOV gcov)
> +    find_program(LCOV lcov)
> +
> +    if(NOT GCOV)
> +      message(FATAL_ERROR "gcov not found! Aborting...")
> +    endif()
> +
> +    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --coverage -fno-inline -fno-inline-small-functions -fno-default-inline -fprofile-arcs -fkeep-inline-functions")
> +    message(WARNING "Adding debug options for coverage")

I think this should just be a `STATUS` message instead of a warning.

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