CMakeLists.txt

# CMakeLists.txt

# Copyright (C) 2007-2014 Glenn Randers-Pehrson

# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer
# and license in png.h

cmake_minimum_required(VERSION 2.8)
set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)

if(COMMAND cmake_policy)
  # Library paths (/path/to/libmy.so not translated to -L/path/to -lmy)
  CMAKE_POLICY(SET CMP0003 NEW)
endif()

# SCI fix: do not hardcode configuration types
#set(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo")

project(libpng C)
enable_testing()

set(PNGLIB_MAJOR 1)
set(PNGLIB_MINOR 6)
set(PNGLIB_RELEASE 16)
set(PNGLIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})


###########################################
# Include the ZLib library

set(SYSTEM_ZLIB OFF CACHE INTERNAL "Use system zlib."  FORCE)

if(SYSTEM_ZLIB)
  # needed packages
  find_package(ZLIB REQUIRED)
  include_directories(${ZLIB_INCLUDE_DIR})
else()
  if(Zlib_DIR)
    find_package(Zlib CONFIGS ZlibConfig.cmake HINTS ${Zlib_DIR} NO_SYSTEM_ENVIRONMENT_PATH)
    if(NOT Zlib_FOUND)
      message(FATAL_ERROR "zlib library not found in ${Zlib_DIR}")
    endif()
    include(${ZLIB_USE_FILE})
    if(DO_ZLIB_MANGLE)
      add_definitions(-DZ_PREFIX)
    endif()
  else()
    message(FATAL_ERROR "zlib library is required to compile libpng.")
  endif()
  set(ZLIB_LIBRARY ${SCI_ZLIB_LIBRARY})
  set(ZLIB_INCLUDE ${SCI_ZLIB_INCLUDE})
endif()

if(NOT WIN32)
  find_library(M_LIBRARY
    NAMES m
    PATHS /usr/lib /usr/local/lib
  )
  if(NOT M_LIBRARY)
    message(STATUS
      "math library 'libm' not found - floating point support disabled")
  endif()
else()
  # not needed on windows
  set(M_LIBRARY "")
endif()

# COMMAND LINE OPTIONS
#if(DEFINED PNG_SHARED)
#  option(PNG_SHARED "Build shared lib" ${PNG_SHARED})
#else()
#  option(PNG_SHARED "Build shared lib" ON)
#endif()
#if(DEFINED PNG_STATIC)
#  option(PNG_STATIC "Build static lib" ${PNG_STATIC})
#else()
#  option(PNG_STATIC "Build static lib" ON)
#endif()

set(PNG_STATIC ON)

option(PNG_TESTS  "Build libpng tests" YES)

# Many more configuration options could be added here
option(PNG_DEBUG         "Build with debug output" NO)
option(PNGARG            "Disable ANSI-C prototypes" NO)

# SET LIBNAME
#set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})

# to distinguish between debug and release lib
#set(CMAKE_DEBUG_POSTFIX "d")

# Use the prebuilt pnglibconf.h file from the scripts folder
# TODO: fix this by building with awk; without this no cmake build can be
# configured directly (to do so indirectly use your local awk to build a
# pnglibconf.h in the build directory.)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
               ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
#include_directories(${CMAKE_CURRENT_BINARY_DIR})

###########################################
# Set variables to link it back to the rest
# of the project

SET(SCI_PNG_LIBRARY ${PNGLIB_NAME} CACHE INTERNAL "PNG library name." FORCE)
SET(SCI_PNG_INCLUDE "${CMAKE_CURRENT_SOURCE_DIR};${CMAKE_CURRENT_BINARY_DIR}" CACHE INTERNAL "PNG include directories." FORCE)

# OUR SOURCES
set(libpng_public_hdrs
  png.h
  pngconf.h
  ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h
)
set(libpng_sources
  ${libpng_public_hdrs}
  pngdebug.h
  pnginfo.h
  pngpriv.h
  pngstruct.h
  png.c
  pngerror.c
  pngget.c
  pngmem.c
  pngpread.c
  pngread.c
  pngrio.c
  pngrtran.c
  pngrutil.c
  pngset.c
  pngtrans.c
  pngwio.c
  pngwrite.c
  pngwtran.c
  pngwutil.c
)
set(pngtest_sources
  pngtest.c
)
set(pngvalid_sources
  contrib/libtests/pngvalid.c
)
set(pngstest_sources
  contrib/libtests/pngstest.c
)
# SOME NEEDED DEFINITIONS

if(MSVC)
  add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
endif(MSVC)

if(PNG_DEBUG)
  add_definitions(-DPNG_DEBUG)
endif()

# NOW BUILD OUR TARGET
include_directories(${SCI_PNG_INCLUDE} ${ZLIB_INCLUDE_DIR})

unset(PNG_LIB_TARGETS)

#if(PNG_SHARED)
#  add_library(${PNG_LIB_NAME} SHARED ${libpng_sources})
#  set(PNG_LIB_TARGETS ${PNG_LIB_NAME})
#  if(MSVC)
#    # msvc does not append 'lib' - do it here to have consistent name
#    set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
#    set_target_properties(${PNG_LIB_NAME} PROPERTIES IMPORT_PREFIX "lib")
#  endif()
#  target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
#endif()

#if(PNG_STATIC)
# does not work without changing name
  #set(PNG_LIB_NAME_STATIC ${PNG_LIB_NAME}_static)
  add_library(${SCI_PNG_LIBRARY} STATIC ${libpng_sources})
  list(APPEND PNG_LIB_TARGETS ${SCI_PNG_LIBRARY})
#  if(MSVC)
#    # msvc does not append 'lib' - do it here to have consistent name
#    set_target_properties(${SCI_PNG_LIBRARY} PROPERTIES PREFIX "lib")
#  endif()
  target_link_libraries(${SCI_PNG_LIBRARY} ${ZLIB_LIBRARY} ${M_LIBRARY})
#endif()

if(NOT PNG_LIB_TARGETS)
  message(SEND_ERROR
    "No library variant selected to build. "
    "Please enable at least one of the following options: PNG_STATIC, PNG_SHARED")
endif()

#if(PNG_SHARED AND WIN32)
#  set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
#endif()

#if(PNG_TESTS AND PNG_SHARED)
#  # does not work with msvc due to png_lib_ver issue
#  add_executable(pngtest ${pngtest_sources})
#  target_link_libraries(pngtest ${PNG_LIB_NAME})
#  add_test(pngtest ./pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
#  #
#  add_executable(pngvalid ${pngvalid_sources})
#  target_link_libraries(pngvalid ${PNG_LIB_NAME})
#  add_test(pngvalid ./pngvalid)
#  add_executable(pngstest ${pngstest_sources})
#  target_link_libraries(pngstest ${PNG_LIB_NAME})
#  add_test(pngstest ./pngstest
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g01.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g02.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g04.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g16.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn2c08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn2c16.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p01.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p02.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p04.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn4a08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn4a16.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn6a08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn6a16.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn0g01.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn0g02.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn0g04.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn2c16.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn3p08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbgn2c16.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbgn3p08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbrn2c08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbwn0g16.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbwn3p08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbyn3p08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp0n0g08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp0n2c08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp0n3p08.png
#    ${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp1n3p08.png
#  )
#endif()

# Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set
IF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
  SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY "lib")
ENDIF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)

# Set a variable with CMake code which:
# Creates a symlink from src to dest (if possible) or alternatively
# copies if different.
macro(CREATE_SYMLINK SRC_FILE DEST_FILE)
  FILE(REMOVE ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE})
  if(WIN32 AND NOT CYGWIN AND NOT MSYS)
    ADD_CUSTOM_COMMAND(
        OUTPUT ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}   ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
        COMMAND ${CMAKE_COMMAND} -E copy_if_different  "${SRC_FILE}" ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}
        COMMAND ${CMAKE_COMMAND} -E copy_if_different  "${SRC_FILE}" ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
        DEPENDS ${PNG_LIB_TARGETS}
        )
    ADD_CUSTOM_TARGET(${DEST_FILE}_COPY ALL DEPENDS ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE})
  else(WIN32 AND NOT CYGWIN AND NOT MSYS)
    get_filename_component(LINK_TARGET "${SRC_FILE}" NAME)
    execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${LINK_TARGET}" ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${LINK_TARGET}" ${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
  endif(WIN32 AND NOT CYGWIN AND NOT MSYS)
endmacro()

# libpng is a library so default to 'lib'
if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
  set(CMAKE_INSTALL_LIBDIR lib)
endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)

# CREATE PKGCONFIG FILES
# we use the same files like ./configure, so we have to set its vars
# Only do this on Windows for Cygwin - the files don't make much sense outside
# a UNIX look alike
if(NOT WIN32 OR CYGWIN OR MINGW)
  set(prefix      ${CMAKE_INSTALL_PREFIX})
  set(exec_prefix ${CMAKE_INSTALL_PREFIX})
  set(libdir      ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
  set(includedir  ${CMAKE_INSTALL_PREFIX}/include)
  set(LIBS        "-lz -lm")
  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
    ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
  CREATE_SYMLINK(${PNGLIB_NAME}.pc libpng.pc)

  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
    ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
  CREATE_SYMLINK(${PNGLIB_NAME}-config libpng-config)
endif(NOT WIN32 OR CYGWIN OR MINGW)

# SET UP LINKS
#if(PNG_SHARED)
#  set_target_properties(${PNG_LIB_NAME} PROPERTIES
#   VERSION 16.${PNGLIB_RELEASE}.1.6.16
#    VERSION 16.${PNGLIB_RELEASE}.0
#    SOVERSION 16
#    CLEAN_DIRECT_OUTPUT 1)
#endif()
#if(PNG_STATIC)
#  # MSVC doesn't use a different file extension for shared vs. static
#  # libs.  We are able to change OUTPUT_NAME to remove the _static
#  # for all other platforms.
#  if(NOT MSVC)
#    set_target_properties(${SCI_PNG_LIBRARY} PROPERTIES
#      OUTPUT_NAME ${PNG_LIB_NAME}
#      CLEAN_DIRECT_OUTPUT 1)
#  endif()
#endif()

# If CMake > 2.4.x, we set a variable used below to export
# targets to an export file.
# TODO: Use VERSION_GREATER after our cmake_minimum_required >= 2.6.2
if(CMAKE_MAJOR_VERSION GREATER 1 AND CMAKE_MINOR_VERSION GREATER 4)
  set(PNG_EXPORT_RULE EXPORT libpng)
elseif(CMAKE_MAJOR_VERSION GREATER 2) # future proof
  set(PNG_EXPORT_RULE EXPORT libpng)
endif()

# INSTALL
#if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
#  install(TARGETS ${PNG_LIB_TARGETS}
#      ${PNG_EXPORT_RULE}
#      RUNTIME DESTINATION bin
#      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
#      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
#
#  if(PNG_SHARED)
#    # Create a symlink for libpng.dll.a => libpng16.dll.a on Cygwin
#    if(CYGWIN OR MINGW)
#       get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
#       CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_IMPORT_LIBRARY_SUFFIX})
#       install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX}
#         DESTINATION ${CMAKE_INSTALL_LIBDIR})
#    endif(CYGWIN OR MINGW)
#
#    if(NOT WIN32)
#      get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
#      CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_SHARED_LIBRARY_SUFFIX})
#      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
#         DESTINATION ${CMAKE_INSTALL_LIBDIR})
#    endif(NOT WIN32)
#  endif(PNG_SHARED)
#
#  if(PNG_STATIC)
#    if(NOT WIN32 OR CYGWIN OR MINGW)
#      get_target_property(BUILD_TARGET_LOCATION ${SCI_PNG_LIBRARY} LOCATION_${CMAKE_BUILD_TYPE})
#      CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_STATIC_LIBRARY_SUFFIX})
#      install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
#         DESTINATION ${CMAKE_INSTALL_LIBDIR})
#    endif(NOT WIN32 OR CYGWIN OR MINGW)
# endif()
#endif()
#
#if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
#  install(FILES ${libpng_public_hdrs}   DESTINATION include)
#  install(FILES ${libpng_public_hdrs}   DESTINATION include/${PNGLIB_NAME})
#endif()
#if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
#  if(NOT WIN32 OR CYGWIN OR MINGW)
#    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
#    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
#            DESTINATION bin)
#  endif(NOT WIN32 OR CYGWIN OR MINGW)
#endif()
#
#if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
#  # Install man pages
#  if(NOT PNG_MAN_DIR)
#    set(PNG_MAN_DIR "share/man")
#  endif()
#  install(FILES libpng.3 libpngpf.3      DESTINATION ${PNG_MAN_DIR}/man3)
##  install(FILES png.5                    DESTINATION ${PNG_MAN_DIR}/man5)
#  # Install pkg-config files
#  if(NOT WIN32 OR CYGWIN OR MINGW)
#    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
#            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
#    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
#            DESTINATION bin)
#    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
#            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
#    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
#            DESTINATION bin)
#  endif(NOT WIN32 OR CYGWIN OR MINGW)
#endif()
#
## On versions of CMake that support it, create an export file CMake
## users can include() to import our targets
#if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
#  install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
#endif()

# what's with libpng-manual.txt and all the extra files?

# UNINSTALL
# do we need this?

# DIST
# do we need this?

# to create msvc import lib for mingw compiled shared lib
# pexports libpng.dll > libpng.def
# lib /def:libpng.def /machine:x86

set(SCI_PNG_LIBRARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
set(PNG_USE_FILE "${CMAKE_CURRENT_SOURCE_DIR}/UseLibPNG.cmake")

configure_file(LibPNGConfig.cmake.in "${CMAKE_CURRENT_BINARY_DIR}/LibPNGConfig.cmake" @ONLY)
export(TARGETS ${SCI_PNG_LIBRARY} FILE LibPNGExports.cmake)