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CatchMiscFunctions.cmake: Use PRIVATE for target_compile_options (#2553)
With the changes to how `-ffile-prefix-map` is detected, Catch2 started propagating the flag to its dependents, which isn't the desired behaviour, the normalization should only apply to Catch2's impl.
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@ -13,7 +13,7 @@ function(add_cxx_flag_if_supported_to_targets flagname targets)
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if (HAVE_FLAG_${flag_identifier})
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foreach(target ${targets})
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target_compile_options(${target} PUBLIC ${flagname})
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target_compile_options(${target} PRIVATE ${flagname})
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endforeach()
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endif()
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endfunction()
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