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CMAKE_<LANG>_FLAGS
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------------------
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Flags for all build types.
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``<LANG>`` flags used regardless of the value of :variable:`CMAKE_BUILD_TYPE`.
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This is initialized for each language from environment variables:
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* ``CMAKE_C_FLAGS``:
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Initialized by the :envvar:`CFLAGS` environment variable.
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* ``CMAKE_CXX_FLAGS``:
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Initialized by the :envvar:`CXXFLAGS` environment variable.
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* ``CMAKE_CUDA_FLAGS``:
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Initialized by the :envvar:`CUDAFLAGS` environment variable.
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* ``CMAKE_Fortran_FLAGS``:
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Initialized by the :envvar:`FFLAGS` environment variable.
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This value is a command-line string fragment. Therefore, multiple options
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should be separated by spaces, and options with spaces should be quoted.
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The flags in this variable will be passed to the compiler before those
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in the per-configuration :variable:`CMAKE_<LANG>_FLAGS_<CONFIG>` variant,
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and before flags added by the :command:`add_compile_options` or
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:command:`target_compile_options` commands.
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