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#This script just runs CMake's built in JPEG finding tool. But it also checks that the
#copy of libjpeg 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 libjpeg when building python in visual studio
set(JPEG_FOUND 0)
return()
endif()
# Don't rerun this script if its already been executed.
if (DEFINED JPEG_FOUND)
return()
endif()
find_package(JPEG QUIET)
if(JPEG_FOUND)
set(JPEG_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_libjpeg_worked
${PROJECT_BINARY_DIR}/test_for_libjpeg_build
${CMAKE_CURRENT_LIST_DIR}/test_for_libjpeg
test_if_libjpeg_is_broken
CMAKE_FLAGS "${JPEG_TEST_CMAKE_FLAGS}")
message (STATUS "Found system copy of libjpeg: ${JPEG_LIBRARY}")
if(NOT test_for_libjpeg_worked)
set(JPEG_FOUND 0)
message (STATUS "System copy of libjpeg is broken or too old. Will build our own libjpeg and use that instead.")
endif()
endif()
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