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