coco
38 lines
1.1 KiB
CMake
38 lines
1.1 KiB
CMake
#This script just runs CMake's built in PNG finding tool. But it also checks that the
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#copy of libpng that cmake finds actually builds and links.
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cmake_minimum_required(VERSION 2.8.12)
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if (BUILDING_PYTHON_IN_MSVC)
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# Never use any system copy of libpng when building python in visual studio
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set(PNG_FOUND 0)
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return()
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endif()
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# Don't rerun this script if its already been executed.
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if (DEFINED PNG_FOUND)
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return()
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endif()
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find_package(PNG QUIET)
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if(PNG_FOUND)
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set(PNG_TEST_CMAKE_FLAGS
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"-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}"
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"-DCMAKE_INCLUDE_PATH=${CMAKE_INCLUDE_PATH}"
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"-DCMAKE_LIBRARY_PATH=${CMAKE_LIBRARY_PATH}")
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try_compile(test_for_libpng_worked
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${PROJECT_BINARY_DIR}/test_for_libpng_build
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${CMAKE_CURRENT_LIST_DIR}/test_for_libpng
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test_if_libpng_is_broken
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CMAKE_FLAGS "${PNG_TEST_CMAKE_FLAGS}")
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message (STATUS "Found system copy of libpng: ${PNG_LIBRARIES}")
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if(NOT test_for_libpng_worked)
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set(PNG_FOUND 0)
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message (STATUS "System copy of libpng is broken. Will build our own libpng and use that instead.")
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endif()
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endif()
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