CMakeLists.txt 34.7 KB
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# CMakeLists.txt

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# Copyright (C) 2018 Cosmin Truta
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# Copyright (C) 2007,2009-2018 Glenn Randers-Pehrson
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# Written by Christian Ehrlicher, 2007
# Revised by Roger Lowman, 2009-2010
# Revised by Clifford Yapp, 2011-2012
# Revised by Roger Leigh, 2016
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# Revised by Andreas Franek, 2016
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# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer
# and license in png.h

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cmake_minimum_required(VERSION 3.0.2)
cmake_policy(VERSION 3.0.2)
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# Set MacOSX @rpath usage globally.
if (POLICY CMP0020)
  cmake_policy(SET CMP0020 NEW)
endif(POLICY CMP0020)
if (POLICY CMP0042)
  cmake_policy(SET CMP0042 NEW)
endif(POLICY CMP0042)
# Use new variable expansion policy.
if (POLICY CMP0053)
  cmake_policy(SET CMP0053 NEW)
endif(POLICY CMP0053)
if (POLICY CMP0054)
  cmake_policy(SET CMP0054 NEW)
endif(POLICY CMP0054)
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set(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo")

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project(libpng C ASM)
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enable_testing()
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set(PNGLIB_MAJOR 1)
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set(PNGLIB_MINOR 6)
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set(PNGLIB_RELEASE 36)
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set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
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include(GNUInstallDirs)

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# needed packages
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#Allow users to specify location of Zlib,
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# Useful if zlib is being built alongside this as a sub-project
option(PNG_BUILD_ZLIB "Custom zlib Location, else find_package is used" OFF)

IF(NOT PNG_BUILD_ZLIB)
  find_package(ZLIB REQUIRED)
  include_directories(${ZLIB_INCLUDE_DIR})
ENDIF(NOT PNG_BUILD_ZLIB)
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if(NOT WIN32)
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  find_library(M_LIBRARY
    NAMES m
    PATHS /usr/lib /usr/local/lib
  )
  if(NOT M_LIBRARY)
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    message(STATUS "math lib 'libm' not found; floating point support disabled")
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    set(M_LIBRARY "")
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  endif()
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else()
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  # not needed on windows
  set(M_LIBRARY "")
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endif()
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# COMMAND LINE OPTIONS
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option(PNG_SHARED "Build shared lib" ON)
option(PNG_STATIC "Build static lib" ON)
option(PNG_TESTS  "Build libpng tests" ON)
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# Many more configuration options could be added here
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option(PNG_FRAMEWORK "Build OS X framework" OFF)
option(PNG_DEBUG     "Build with debug output" OFF)
option(PNGARG        "Disable ANSI-C prototypes" OFF)
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option(PNG_HARDWARE_OPTIMIZATIONS "Enable Hardware Optimizations" ON)


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set(PNG_PREFIX "" CACHE STRING "Prefix to add to the API function names")
set(DFA_XTRA "" CACHE FILEPATH "File containing extra configuration settings")

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if(PNG_HARDWARE_OPTIMIZATIONS)
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# set definitions and sources for arm
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if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" OR
  CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
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  set(PNG_ARM_NEON_POSSIBLE_VALUES check on off)
  set(PNG_ARM_NEON "check" CACHE STRING "Enable ARM NEON optimizations:
     check: (default) use internal checking code;
     off: disable the optimizations;
     on: turn on unconditionally.")
  set_property(CACHE PNG_ARM_NEON PROPERTY STRINGS
     ${PNG_ARM_NEON_POSSIBLE_VALUES})
  list(FIND PNG_ARM_NEON_POSSIBLE_VALUES ${PNG_ARM_NEON} index)
  if(index EQUAL -1)
    message(FATAL_ERROR
      " PNG_ARM_NEON must be one of [${PNG_ARM_NEON_POSSIBLE_VALUES}]")
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  elseif(NOT ${PNG_ARM_NEON} STREQUAL "off")
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    set(libpng_arm_sources
      arm/arm_init.c
      arm/filter_neon.S
      arm/filter_neon_intrinsics.c)
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    if(${PNG_ARM_NEON} STREQUAL "on")
      add_definitions(-DPNG_ARM_NEON_OPT=2)
    elseif(${PNG_ARM_NEON} STREQUAL "check")
      add_definitions(-DPNG_ARM_NEON_CHECK_SUPPORTED)
    endif()
  else()
    add_definitions(-DPNG_ARM_NEON_OPT=0)
  endif()
endif()

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# set definitions and sources for powerpc
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if(CMAKE_SYSTEM_PROCESSOR MATCHES "^powerpc*" OR
	CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*" )
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  set(PNG_POWERPC_VSX_POSSIBLE_VALUES on off)
  set(PNG_POWERPC_VSX "on" CACHE STRING "Enable POWERPC VSX optimizations:
     off: disable the optimizations.")
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  set_property(CACHE PNG_POWERPC_VSX PROPERTY STRINGS
     ${PNG_POWERPC_VSX_POSSIBLE_VALUES})
  list(FIND PNG_POWERPC_VSX_POSSIBLE_VALUES ${PNG_POWERPC_VSX} index)
  if(index EQUAL -1)
    message(FATAL_ERROR
      " PNG_POWERPC_VSX must be one of [${PNG_POWERPC_VSX_POSSIBLE_VALUES}]")
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  elseif(NOT ${PNG_POWERPC_VSX} STREQUAL "off")
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    set(libpng_powerpc_sources
      powerpc/powerpc_init.c
      powerpc/filter_vsx_intrinsics.c)
    if(${PNG_POWERPC_VSX} STREQUAL "on")
      add_definitions(-DPNG_POWERPC_VSX_OPT=2)
    endif()
  else()
    add_definitions(-DPNG_POWERPC_VSX_OPT=0)
  endif()
endif()

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# set definitions and sources for intel
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i?86" OR
	CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*" )
  set(PNG_INTEL_SSE_POSSIBLE_VALUES on off)
  set(PNG_INTEL_SSE "on" CACHE STRING "Enable INTEL_SSE optimizations:
     off: disable the optimizations")
  set_property(CACHE PNG_INTEL_SSE PROPERTY STRINGS
     ${PNG_INTEL_SSE_POSSIBLE_VALUES})
  list(FIND PNG_INTEL_SSE_POSSIBLE_VALUES ${PNG_INTEL_SSE} index)
  if(index EQUAL -1)
    message(FATAL_ERROR
      " PNG_INTEL_SSE must be one of [${PNG_INTEL_SSE_POSSIBLE_VALUES}]")
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  elseif(NOT ${PNG_INTEL_SSE} STREQUAL "off")
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    set(libpng_intel_sources
      intel/intel_init.c
      intel/filter_sse2_intrinsics.c)
    if(${PNG_INTEL_SSE} STREQUAL "on")
      add_definitions(-DPNG_INTEL_SSE_OPT=1)
    endif()
  else()
    add_definitions(-DPNG_INTEL_SSE_OPT=0)
  endif()
endif()

# set definitions and sources for MIPS
if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
	CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*" )
  set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
  set(PNG_MIPS_MSA "on" CACHE STRING "Enable MIPS_MSA optimizations:
     off: disable the optimizations")
  set_property(CACHE PNG_MIPS_MSA PROPERTY STRINGS
     ${PNG_MIPS_MSA_POSSIBLE_VALUES})
  list(FIND PNG_MIPS_MSA_POSSIBLE_VALUES ${PNG_MIPS_MSA} index)
  if(index EQUAL -1)
    message(FATAL_ERROR
      " PNG_MIPS_MSA must be one of [${PNG_MIPS_MSA_POSSIBLE_VALUES}]")
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  elseif(NOT ${PNG_MIPS_MSA} STREQUAL "off")
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    set(libpng_mips_sources
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      mips/mips_init.c
      mips/filter_msa_intrinsics.c)
    if(${PNG_MIPS_MSA} STREQUAL "on")
      add_definitions(-DPNG_MIPS_MSA_OPT=2)
    endif()
  else()
    add_definitions(-DPNG_MIPS_MSA_OPT=0)
  endif()
endif()
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else(PNG_HARDWARE_OPTIMIZATIONS)
# set definitions and sources for arm
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" OR
	CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
  add_definitions(-DPNG_ARM_NEON_OPT=0)
endif()

# set definitions and sources for powerpc
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^powerpc*" OR
	CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*" )
  add_definitions(-DPNG_POWERPC_VSX_OPT=0)
endif()

# set definitions and sources for intel
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i?86" OR
	CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*" )
  add_definitions(-DPNG_INTEL_SSE_OPT=0)
endif()

# set definitions and sources for MIPS
if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
	CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*" )
  add_definitions(-DPNG_MIPS_MSA_OPT=0)
endif()
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endif(PNG_HARDWARE_OPTIMIZATIONS)
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# SET LIBNAME
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set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
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# to distinguish between debug and release lib
set(CMAKE_DEBUG_POSTFIX "d")

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include(CheckCSourceCompiles)
option(ld-version-script "Enable linker version script" ON)
if(ld-version-script AND NOT APPLE)
  # Check if LD supports linker scripts.
  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map" "VERS_1 {
        global: sym;
        local: *;
};

VERS_2 {
        global: sym2;
                main;
} VERS_1;
")
  set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/conftest.map'")
  check_c_source_compiles("void sym(void) {}
void sym2(void) {}
int main(void) {return 0;}
" HAVE_LD_VERSION_SCRIPT)
  if(NOT HAVE_LD_VERSION_SCRIPT)
    set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE} "-Wl,-M -Wl,${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
  check_c_source_compiles("void sym(void) {}
void sym2(void) {}
int main(void) {return 0;}
" HAVE_SOLARIS_LD_VERSION_SCRIPT)
  endif()
  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE})
  file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
endif()

# Find symbol prefix.  Likely obsolete and unnecessary with recent
# toolchains (it's not done in many other projects).
function(symbol_prefix)
  set(SYMBOL_PREFIX)

  execute_process(COMMAND "${CMAKE_C_COMPILER}" "-E" "-"
                  INPUT_FILE /dev/null
                  OUTPUT_VARIABLE OUT
                  RESULT_VARIABLE STATUS)

  if(CPP_FAIL)
    message(WARNING "Failed to run the C preprocessor")
  endif()

  string(REPLACE "\n" ";" OUT "${OUT}")
  foreach(line ${OUT})
    string(REGEX MATCH "^PREFIX=" found_match "${line}")
    if(found_match)
      STRING(REGEX REPLACE "^PREFIX=(.*\)" "\\1" prefix "${line}")
      string(REGEX MATCH "__USER_LABEL_PREFIX__" found_match "${prefix}")
      if(found_match)
        STRING(REGEX REPLACE "(.*)__USER_LABEL_PREFIX__(.*)" "\\1\\2" prefix "${prefix}")
      endif()
      set(SYMBOL_PREFIX "${prefix}")
    endif()
  endforeach()

    message(STATUS "Symbol prefix: ${SYMBOL_PREFIX}")
    set(SYMBOL_PREFIX "${SYMBOL_PREFIX}" PARENT_SCOPE)
endfunction()

if(UNIX)
  symbol_prefix()
endif()

find_program(AWK NAMES gawk awk)

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include_directories(${CMAKE_CURRENT_BINARY_DIR})
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if(NOT AWK OR ANDROID)
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  # No awk available to generate sources; use pre-built pnglibconf.h
  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
                 ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
  add_custom_target(genfiles) # Dummy
else()
  include(CMakeParseArguments)
  # Generate .chk from .out with awk
  # generate_chk(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
  function(generate_chk)
    set(options)
    set(oneValueArgs INPUT OUTPUT)
    set(multiValueArgs DEPENDS)
    cmake_parse_arguments(_GC "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
    if (NOT _GC_INPUT)
      message(FATAL_ERROR "Invalid arguments.  generate_out requires input.")
    endif()
    if (NOT _GC_OUTPUT)
      message(FATAL_ERROR "Invalid arguments.  generate_out requires output.")
    endif()

    add_custom_command(OUTPUT "${_GC_OUTPUT}"
                       COMMAND "${CMAKE_COMMAND}"
                               "-DINPUT=${_GC_INPUT}"
                               "-DOUTPUT=${_GC_OUTPUT}"
                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake"
                       DEPENDS "${_GC_INPUT}" ${_GC_DEPENDS}
                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
  endfunction()

  # Generate .out from .c with awk
  # generate_out(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
  function(generate_out)
    set(options)
    set(oneValueArgs INPUT OUTPUT)
    set(multiValueArgs DEPENDS)
    cmake_parse_arguments(_GO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
    if (NOT _GO_INPUT)
      message(FATAL_ERROR "Invalid arguments.  generate_out requires input.")
    endif()
    if (NOT _GO_OUTPUT)
      message(FATAL_ERROR "Invalid arguments.  generate_out requires output.")
    endif()

    add_custom_command(OUTPUT "${_GO_OUTPUT}"
                       COMMAND "${CMAKE_COMMAND}"
                               "-DINPUT=${_GO_INPUT}"
                               "-DOUTPUT=${_GO_OUTPUT}"
                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake"
                       DEPENDS "${_GO_INPUT}" ${_GO_DEPENDS}
                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
  endfunction()

  # Generate specific source file with awk
  # generate_source(OUTPUT outputfile [DEPENDS dep1 [dep2...]])
  function(generate_source)
    set(options)
    set(oneValueArgs OUTPUT)
    set(multiValueArgs DEPENDS)
    cmake_parse_arguments(_GSO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
    if (NOT _GSO_OUTPUT)
      message(FATAL_ERROR "Invalid arguments.  generate_source requires output.")
    endif()

    add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_GSO_OUTPUT}"
                       COMMAND "${CMAKE_COMMAND}"
                               "-DOUTPUT=${_GSO_OUTPUT}"
                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
                       DEPENDS ${_GSO_DEPENDS}
                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
  endfunction()

  # Copy file
  function(generate_copy source destination)
    add_custom_command(OUTPUT "${destination}"
                       COMMAND "${CMAKE_COMMAND}" -E remove "${destination}"
                       COMMAND "${CMAKE_COMMAND}" -E copy "${source}"
                                                          "${destination}"
                       DEPENDS "${source}")
  endfunction()

  # Generate scripts/pnglibconf.h
  generate_source(OUTPUT "scripts/pnglibconf.c"
                  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
                          "${CMAKE_CURRENT_SOURCE_DIR}/scripts/options.awk"
                          "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")

  # Generate pnglibconf.c
  generate_source(OUTPUT "pnglibconf.c"
                  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
                          "${CMAKE_CURRENT_SOURCE_DIR}/scripts/options.awk"
                          "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")

  if(PNG_PREFIX)
    set(PNGLIBCONF_H_EXTRA_DEPENDS
        "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
        "${CMAKE_CURRENT_SOURCE_DIR}/scripts/macro.lst")
    set(PNGPREFIX_H_EXTRA_DEPENDS
        "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out")
  endif()

  generate_out(INPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c"
               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out")

  # Generate pnglibconf.h
  generate_source(OUTPUT "pnglibconf.h"
                  DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out"
                          ${PNGLIBCONF_H_EXTRA_DEPENDS})

  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/intprefix.c"
               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out"
               DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")

  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/prefix.c"
               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
                       "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out")

  # Generate pngprefix.h
  generate_source(OUTPUT "pngprefix.h"
                  DEPENDS ${PNGPREFIX_H_EXTRA_DEPENDS})

  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/sym.c"
               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
               DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")

  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.c"
               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
                       "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt")

  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/vers.c"
               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
                       "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")

  generate_chk(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk"
               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/checksym.awk"
                       "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.def")

  add_custom_target(symbol-check DEPENDS
                    "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk")

  generate_copy("${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
                "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")
  generate_copy("${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
                "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")

  add_custom_target(genvers DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")
  add_custom_target(gensym DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")

  add_custom_target("genprebuilt"
                    COMMAND "${CMAKE_COMMAND}"
                            "-DOUTPUT=scripts/pnglibconf.h.prebuilt"
                            -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
                    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")

  # A single target handles generation of all generated files.  If
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  # they are depended upon separately by multiple targets, this
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  # confuses parallel make (it would require a separate top-level
  # target for each file to track the dependencies properly).
  add_custom_target(genfiles DEPENDS
    "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym"
    "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers"
    "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c"
    "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
    "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out"
    "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h"
    "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out"
    "${CMAKE_CURRENT_BINARY_DIR}/scripts/pnglibconf.c"
    "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
    "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
    "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk"
    "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
    "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out")
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endif(NOT AWK OR ANDROID)
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# OUR SOURCES
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set(libpng_public_hdrs
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  png.h
  pngconf.h
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  "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
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)
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set(libpng_private_hdrs
  pngpriv.h
  pngdebug.h
  pnginfo.h
  pngstruct.h
)
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if(AWK AND NOT ANDROID)
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  list(APPEND libpng_private_hdrs "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h")
endif()
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set(libpng_sources
  ${libpng_public_hdrs}
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  ${libpng_private_hdrs}
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  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
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  ${libpng_arm_sources}
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  ${libpng_intel_sources}
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  ${libpng_mips_sources}
  ${libpng_powerpc_sources}
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)
set(pngtest_sources
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  pngtest.c
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)
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set(pngvalid_sources
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  contrib/libtests/pngvalid.c
)
set(pngstest_sources
  contrib/libtests/pngstest.c
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)
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set(pngunknown_sources
  contrib/libtests/pngunknown.c
)
set(pngimage_sources
  contrib/libtests/pngimage.c
)
set(pngfix_sources
  contrib/tools/pngfix.c
)
set(png_fix_itxt_sources
  contrib/tools/png-fix-itxt.c
)
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if(MSVC)
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  add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
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endif(MSVC)

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if(PNG_DEBUG)
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  add_definitions(-DPNG_DEBUG)
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endif()
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# NOW BUILD OUR TARGET
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include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})
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unset(PNG_LIB_TARGETS)

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

  if(UNIX AND AWK)
    if(HAVE_LD_VERSION_SCRIPT)
      set_target_properties(png PROPERTIES LINK_FLAGS
        "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
    elseif(HAVE_SOLARIS_LD_VERSION_SCRIPT)
      set_target_properties(png PROPERTIES LINK_FLAGS
        "-Wl,-M -Wl,'${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
    endif()
565
  endif()
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endif()

568
if(PNG_STATIC)
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  # does not work without changing name
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  set(PNG_LIB_NAME_STATIC png_static)
  add_library(png_static STATIC ${libpng_sources})
  add_dependencies(png_static genfiles)
  # MSVC doesn't use a different file extension for shared vs. static
  # libs.  We are able to change OUTPUT_NAME to remove the _static
  # for all other platforms.
  if(NOT MSVC)
    set_target_properties(png_static PROPERTIES
      OUTPUT_NAME "${PNG_LIB_NAME}"
      CLEAN_DIRECT_OUTPUT 1)
  else()
    set_target_properties(png_static PROPERTIES
      OUTPUT_NAME "${PNG_LIB_NAME}_static"
      CLEAN_DIRECT_OUTPUT 1)
  endif()
  list(APPEND PNG_LIB_TARGETS png_static)
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  if(MSVC)
    # msvc does not append 'lib' - do it here to have consistent name
588
    set_target_properties(png_static PROPERTIES PREFIX "lib")
589
  endif()
590
  target_link_libraries(png_static ${ZLIB_LIBRARY} ${M_LIBRARY})
591 592
endif()

593
if(PNG_FRAMEWORK)
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  set(PNG_LIB_NAME_FRAMEWORK png_framework)
  add_library(png_framework SHARED ${libpng_sources})
  add_dependencies(png_framework genfiles)
  list(APPEND PNG_LIB_TARGETS png_framework)
  set_target_properties(png_framework PROPERTIES
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    FRAMEWORK TRUE
    FRAMEWORK_VERSION ${PNGLIB_VERSION}
    MACOSX_FRAMEWORK_SHORT_VERSION_STRING ${PNGLIB_MAJOR}.${PNGLIB_MINOR}
    MACOSX_FRAMEWORK_BUNDLE_VERSION ${PNGLIB_VERSION}
    MACOSX_FRAMEWORK_IDENTIFIER org.libpng.libpng
    XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
    PUBLIC_HEADER "${libpng_public_hdrs}"
    OUTPUT_NAME png)
607
  target_link_libraries(png_framework ${ZLIB_LIBRARY} ${M_LIBRARY})
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endif()

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if(NOT PNG_LIB_TARGETS)
  message(SEND_ERROR
    "No library variant selected to build. "
613 614
    "Please enable at least one of the following options: "
    " PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
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endif()

617
if(PNG_SHARED AND WIN32)
618
  set_target_properties(png PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
619
endif()
620

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function(png_add_test)
  set(options)
  set(oneValueArgs NAME COMMAND)
  set(multiValueArgs OPTIONS FILES)
  cmake_parse_arguments(_PAT "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

  if (NOT _PAT_NAME)
    message(FATAL_ERROR "Invalid arguments.  png_add_test requires name.")
  endif()
  if (NOT _PAT_COMMAND)
    message(FATAL_ERROR "Invalid arguments.  png_add_test requires command.")
  endif()

  set(TEST_OPTIONS "${_PAT_OPTIONS}")
  set(TEST_FILES "${_PAT_FILES}")

  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scripts/test.cmake.in"
                 "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake" @ONLY)
  if(CMAKE_MAJOR_VERSION GREATER 2) # have generator expressions
    add_test(NAME "${_PAT_NAME}"
             COMMAND "${CMAKE_COMMAND}"
             "-DLIBPNG=$<TARGET_FILE:png>"
             "-DTEST_COMMAND=$<TARGET_FILE:${_PAT_COMMAND}>"
             -P "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake")
  else() # old 2.x add_test; limited and won't work well on Windows
    # Note LIBPNG is a dummy value as there are no generator expressions
    add_test("${_PAT_NAME}" "${CMAKE_COMMAND}"
             "-DLIBPNG=${CMAKE_CURRENT_BINARY_DIR}/libpng.so"
             "-DTEST_COMMAND=./${_PAT_COMMAND}"
             -P "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake")
  endif()
endfunction()

654
if(PNG_TESTS AND PNG_SHARED)
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  # Find test PNG files by globbing, but sort lists to ensure
  # consistency between different filesystems.
657
  file(GLOB PNGSUITE_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/*.png")
658
  list(SORT PNGSUITE_PNGS)
659
  file(GLOB TEST_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/testpngs/*.png")
660
  list(SORT TEST_PNGS)
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  set(PNGTEST_PNG "${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png")

664
  add_executable(pngtest ${pngtest_sources})
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  target_link_libraries(pngtest png)

  png_add_test(NAME pngtest COMMAND pngtest FILES "${PNGTEST_PNG}")

669
  add_executable(pngvalid ${pngvalid_sources})
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  target_link_libraries(pngvalid png)

  png_add_test(NAME pngvalid-gamma-16-to-8
               COMMAND pngvalid OPTIONS --gamma-16-to-8)
  png_add_test(NAME pngvalid-gamma-alpha-mode
               COMMAND pngvalid OPTIONS --gamma-alpha-mode)
  png_add_test(NAME pngvalid-gamma-background
               COMMAND pngvalid OPTIONS --gamma-background)
678
  png_add_test(NAME pngvalid-gamma-expand16-alpha-mode
679
               COMMAND pngvalid OPTIONS --gamma-alpha-mode --expand16)
680
  png_add_test(NAME pngvalid-gamma-expand16-background
681
               COMMAND pngvalid OPTIONS --gamma-background --expand16)
682
  png_add_test(NAME pngvalid-gamma-expand16-transform
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               COMMAND pngvalid OPTIONS --gamma-transform --expand16)
  png_add_test(NAME pngvalid-gamma-sbit
               COMMAND pngvalid OPTIONS --gamma-sbit)
  png_add_test(NAME pngvalid-gamma-threshold
               COMMAND pngvalid OPTIONS --gamma-threshold)
  png_add_test(NAME pngvalid-gamma-transform
               COMMAND pngvalid OPTIONS --gamma-transform)
690
  png_add_test(NAME pngvalid-progressive-interlace-standard
691
               COMMAND pngvalid OPTIONS --standard --progressive-read --interlace)
692
  png_add_test(NAME pngvalid-progressive-size
693
               COMMAND pngvalid OPTIONS --size --progressive-read)
694
  png_add_test(NAME pngvalid-progressive-standard
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               COMMAND pngvalid OPTIONS --standard --progressive-read)
  png_add_test(NAME pngvalid-standard
               COMMAND pngvalid OPTIONS --standard)
  png_add_test(NAME pngvalid-transform
               COMMAND pngvalid OPTIONS --transform)

701
  add_executable(pngstest ${pngstest_sources})
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  target_link_libraries(pngstest png)

  foreach(gamma_type 1.8 linear none sRGB)
    foreach(alpha_type none alpha)
      set(PNGSTEST_FILES)
      foreach(test_png ${TEST_PNGS})
        string(REGEX MATCH ".*-linear[-.].*" TEST_PNG_LINEAR "${test_png}")
        string(REGEX MATCH ".*-sRGB[-.].*" TEST_PNG_SRGB "${test_png}")
        string(REGEX MATCH ".*-1.8[-.].*" TEST_PNG_G18 "${test_png}")
        string(REGEX MATCH ".*-alpha-.*" TEST_PNG_ALPHA "${test_png}")

        set(TEST_PNG_VALID TRUE)

        if(TEST_PNG_ALPHA)
          if (NOT "${alpha_type}" STREQUAL "alpha")
            set(TEST_PNG_VALID FALSE)
          endif()
        else()
          if ("${alpha_type}" STREQUAL "alpha")
            set(TEST_PNG_VALID FALSE)
          endif()
        endif()

        if(TEST_PNG_LINEAR)
          if(NOT "${gamma_type}" STREQUAL "linear")
            set(TEST_PNG_VALID FALSE)
          endif()
        elseif(TEST_PNG_SRGB)
          if(NOT "${gamma_type}" STREQUAL "sRGB")
            set(TEST_PNG_VALID FALSE)
          endif()
        elseif(TEST_PNG_G18)
          if(NOT "${gamma_type}" STREQUAL "1.8")
            set(TEST_PNG_VALID FALSE)
          endif()
        else()
          if(NOT "${gamma_type}" STREQUAL "none")
            set(TEST_PNG_VALID FALSE)
          endif()
        endif()

        if(TEST_PNG_VALID)
          list(APPEND PNGSTEST_FILES "${test_png}")
        endif()
      endforeach()
747 748
      # Should already be sorted, but sort anyway to be certain.
      list(SORT PNGSTEST_FILES)
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
      png_add_test(NAME pngstest-${gamma_type}-${alpha_type}
                   COMMAND pngstest
                   OPTIONS --tmpfile "${gamma_type}-${alpha_type}-" --log
                   FILES ${PNGSTEST_FILES})
    endforeach()
  endforeach()

  add_executable(pngunknown ${pngunknown_sources})
  target_link_libraries(pngunknown png)

  png_add_test(NAME pngunknown-discard COMMAND pngunknown OPTIONS --strict default=discard FILES "${PNGTEST_PNG}")
  png_add_test(NAME pngunknown-IDAT COMMAND pngunknown OPTIONS --strict default=discard IDAT=save FILES "${PNGTEST_PNG}")
  png_add_test(NAME pngunknown-if-safe COMMAND pngunknown OPTIONS --strict default=if-safe FILES "${PNGTEST_PNG}")
  png_add_test(NAME pngunknown-sAPI COMMAND pngunknown OPTIONS --strict bKGD=save cHRM=save gAMA=save all=discard iCCP=save sBIT=save sRGB=save FILES "${PNGTEST_PNG}")
  png_add_test(NAME pngunknown-save COMMAND pngunknown OPTIONS --strict default=save FILES "${PNGTEST_PNG}")
  png_add_test(NAME pngunknown-sTER COMMAND pngunknown OPTIONS --strict sTER=if-safe FILES "${PNGTEST_PNG}")
  png_add_test(NAME pngunknown-vpAg COMMAND pngunknown OPTIONS --strict vpAg=if-safe FILES "${PNGTEST_PNG}")

  add_executable(pngimage ${pngimage_sources})
  target_link_libraries(pngimage png)

  png_add_test(NAME pngimage-quick COMMAND pngimage OPTIONS --list-combos --log FILES ${PNGSUITE_PNGS})
  png_add_test(NAME pngimage-full COMMAND pngimage OPTIONS --exhaustive --list-combos --log FILES ${PNGSUITE_PNGS})
endif()

if(PNG_SHARED)
  add_executable(pngfix ${pngfix_sources})
  target_link_libraries(pngfix png)
  set(PNG_BIN_TARGETS pngfix)

  add_executable(png-fix-itxt ${png_fix_itxt_sources})
  target_link_libraries(png-fix-itxt ${ZLIB_LIBRARY} ${M_LIBRARY})
  list(APPEND PNG_BIN_TARGETS png-fix-itxt)
782
endif()
783

784 785 786
# Set a variable with CMake code which:
# Creates a symlink from src to dest (if possible) or alternatively
# copies if different.
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
include(CMakeParseArguments)

function(CREATE_SYMLINK DEST_FILE)

  cmake_parse_arguments(S "" "FILE;TARGET" "" ${ARGN})

  if(NOT S_TARGET AND NOT S_FILE)
    message(FATAL_ERROR "Specify either a TARGET or a FILE for CREATE_SYMLINK to link to.")
  endif(NOT S_TARGET AND NOT S_FILE)

  if(S_TARGET AND S_FILE)
    message(FATAL_ERROR "CREATE_SYMLINK called with both source file ${S_FILE} and build target ${S_TARGET} arguments - can only handle 1 type per call.")
  endif(S_TARGET AND S_FILE)

  if(S_FILE)
    # If we don't need to symlink something that's coming from a build target,
    # we can go ahead and symlink/copy at configure time.

805
    if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
806 807 808 809
      execute_process(
	COMMAND "${CMAKE_COMMAND}" -E copy_if_different ${S_FILE} ${DEST_FILE}
	WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
	)
810
    else(CMAKE_HOST_WIN32 AND NOT CYGWIN)
811 812 813 814
      execute_process(
	COMMAND ${CMAKE_COMMAND} -E create_symlink ${S_FILE} ${DEST_FILE}
	WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
	)
815
    endif(CMAKE_HOST_WIN32 AND NOT CYGWIN)
816 817 818 819 820 821 822
  endif(S_FILE)

  if(S_TARGET)
    # We need to use generator expressions, which can be a bit tricky, so for
    # simplicity make the symlink a POST_BUILD step and use the TARGET
    # signature of add_custom_command.

823
    if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
824 825 826
      add_custom_command(TARGET ${S_TARGET} POST_BUILD
	COMMAND "${CMAKE_COMMAND}" -E copy_if_different $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE}
	)
827
    else(CMAKE_HOST_WIN32 AND NOT CYGWIN)
828 829 830
      add_custom_command(TARGET ${S_TARGET} POST_BUILD
	COMMAND "${CMAKE_COMMAND}" -E create_symlink $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE}
	)
831
    endif(CMAKE_HOST_WIN32 AND NOT CYGWIN)
832 833 834 835

  endif(S_TARGET)

endfunction()
836

837 838 839 840 841 842 843 844 845
# Create source generation scripts.
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genchk.cmake.in
               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake @ONLY)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genout.cmake.in
               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake @ONLY)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/gensrc.cmake.in
               ${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake @ONLY)


846
# libpng is a library so default to 'lib'
847
if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
848
  set(CMAKE_INSTALL_LIBDIR lib)
849
endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
850 851 852 853 854

# 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
855 856 857 858 859 860 861 862
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)
863
  CREATE_SYMLINK(libpng.pc FILE ${PNGLIB_NAME}.pc)
864 865 866

  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
    ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
867
  CREATE_SYMLINK(libpng-config FILE ${PNGLIB_NAME}-config)
868
endif(NOT WIN32 OR CYGWIN OR MINGW)
869 870

# SET UP LINKS
871
if(PNG_SHARED)
872
  set_target_properties(png PROPERTIES
873
#   VERSION 16.${PNGLIB_RELEASE}.1.6.36.git
874 875
    VERSION 16.${PNGLIB_RELEASE}.0
    SOVERSION 16
876
    CLEAN_DIRECT_OUTPUT 1)
877 878
endif()

879 880 881 882 883 884 885 886 887
# 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()

888 889
# INSTALL
if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
890 891 892 893
  install(TARGETS ${PNG_LIB_TARGETS}
      ${PNG_EXPORT_RULE}
      RUNTIME DESTINATION bin
      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
894 895
      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
      FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR})
896

897
  if(PNG_SHARED)
898
    # Create a symlink for libpng.dll.a => libpng16.dll.a on Cygwin
899
    if(CYGWIN OR MINGW)
900 901
      CREATE_SYMLINK(libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} TARGET png)
      install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
902
    endif(CYGWIN OR MINGW)
903 904

    if(NOT WIN32)
905 906
      CREATE_SYMLINK(libpng${CMAKE_SHARED_LIBRARY_SUFFIX} TARGET png)
      install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_SHARED_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
907 908
    endif(NOT WIN32)
  endif(PNG_SHARED)
909

910
  if(PNG_STATIC)
911
    if(NOT WIN32 OR CYGWIN OR MINGW)
912 913
      CREATE_SYMLINK( libpng${CMAKE_STATIC_LIBRARY_SUFFIX} TARGET png_static)
      install(FILES $<TARGET_LINKER_FILE_DIR:png_static>/libpng${CMAKE_STATIC_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
914
    endif(NOT WIN32 OR CYGWIN OR MINGW)
915
 endif()
916 917 918
endif()

if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
919 920
  install(FILES ${libpng_public_hdrs}   DESTINATION include)
  install(FILES ${libpng_public_hdrs}   DESTINATION include/${PNGLIB_NAME})
921 922
endif()
if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
923 924 925 926 927
  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)
928
endif()
929

930 931 932 933 934
if(NOT SKIP_INSTALL_PROGRAMS AND NOT SKIP_INSTALL_ALL )
  install(TARGETS ${PNG_BIN_TARGETS}
      RUNTIME DESTINATION bin)
endif()

935
if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
936
  # Install man pages
937 938 939 940 941
  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)
942
  # Install pkg-config files
943
  if(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
944 945 946 947 948 949 950 951
    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)
952
  endif(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
953
endif()
954

955 956 957 958 959 960
# 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()

961
# what's with libpng-manual.txt and all the extra files?
962

963
# UNINSTALL
964 965
# do we need this?

966
# DIST
967 968 969 970 971
# 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