Fix option name to match name in use in conditional.
Also add a useful doc string.
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@ -13,7 +13,7 @@ if (CXX_COMPAT_GCC)
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endif (_warn_flag)
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endif ()
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option(SILENCE_DUNE_WARNINGS "Disable warnings from DUNE?" OFF)
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option(SILENCE_EXTERNAL_WARNINGS "Disable some warnings from external packages (requires GCC 4.6 or newer)" OFF)
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if(SILENCE_EXTERNAL_WARNINGS AND CXX_COMPAT_GCC)
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file(WRITE ${CMAKE_BINARY_DIR}/disable_warning_pragmas.h "
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#pragma GCC diagnostic push
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