FindPNG: Honor old PNG_LIBRARY if provided (#14398)
In commit 2a797539
(FindPNG: improve library detection, 2013-07-27) we
split the search for PNG into separate PNG_LIBRARY_DEBUG and
PNG_LIBRARY_RELEASE variables. However, if a project or user sets the
old PNG_LIBRARY value we must honor it instead of searching.
While at it, mark PNG_LIBRARY_RELEASE and PNG_LIBRARY_DEBUG as advanced
and remove a stray debug message.
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@ -58,15 +58,19 @@ if(ZLIB_FOUND)
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list(APPEND PNG_NAMES png${v} libpng${v})
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list(APPEND PNG_NAMES_DEBUG png${v}d libpng${v}d)
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endforeach()
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message(STATUS "PNG r: ${PNG_NAMES} d: ${PNG_NAMES_DEBUG}")
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unset(_PNG_VERSION_SUFFIXES)
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find_library(PNG_LIBRARY_RELEASE NAMES ${PNG_NAMES})
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find_library(PNG_LIBRARY_DEBUG NAMES ${PNG_NAMES_DEBUG})
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# For compatiblity with versions prior to this multi-config search, honor
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# any PNG_LIBRARY that is already specified and skip the search.
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if(NOT PNG_LIBRARY)
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find_library(PNG_LIBRARY_RELEASE NAMES ${PNG_NAMES})
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find_library(PNG_LIBRARY_DEBUG NAMES ${PNG_NAMES_DEBUG})
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include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
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select_library_configurations(PNG)
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mark_as_advanced(PNG_LIBRARY_RELEASE PNG_LIBRARY_DEBUG)
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endif()
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unset(PNG_NAMES)
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unset(PNG_NAMES_DEBUG)
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include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
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select_library_configurations(PNG)
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# Set by select_library_configurations(), but we want the one from
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# find_package_handle_standard_args() below.
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unset(PNG_FOUND)
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