external/libpng-1.6.37/CMakeLists.txt

   1 # CMakeLists.txt
   2
   3 # Copyright (C) 2018 Cosmin Truta
   4 # Copyright (C) 2007,2009-2018 Glenn Randers-Pehrson
   5 # Written by Christian Ehrlicher, 2007
   6 # Revised by Roger Lowman, 2009-2010
   7 # Revised by Clifford Yapp, 2011-2012,2017
   8 # Revised by Roger Leigh, 2016
   9 # Revised by Andreas Franek, 2016
  10 # Revised by Sam Serrels, 2017
  11 # Revised by Vadim Barkov, 2017
  12 # Revised by Vicky Pfau, 2018
  13 # Revised by Cameron Cawley, 2018
  14 # Revised by Cosmin Truta, 2018
  15 # Revised by Kyle Bentley, 2018
  16
  17 # This code is released under the libpng license.
  18 # For conditions of distribution and use, see the disclaimer
  19 # and license in png.h
  20
  21 cmake_minimum_required(VERSION 3.1)
  22 cmake_policy(VERSION 3.1)
  23
  24 project(libpng C ASM)
  25 enable_testing()
  26
  27 set(PNGLIB_MAJOR 1)
  28 set(PNGLIB_MINOR 6)
  29 set(PNGLIB_RELEASE 37)
  30 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
  31 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
  32
  33 include(GNUInstallDirs)
  34
  35 # needed packages
  36
  37 # Allow users to specify location of Zlib.
  38 # Useful if zlib is being built alongside this as a sub-project.
  39 option(PNG_BUILD_ZLIB "Custom zlib Location, else find_package is used" OFF)
  40
  41 if(NOT PNG_BUILD_ZLIB)
  42   find_package(ZLIB REQUIRED)
  43   include_directories(${ZLIB_INCLUDE_DIR})
  44 endif()
  45
  46 if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU)
  47   find_library(M_LIBRARY m)
  48 else()
  49   # libm is not needed and/or not available
  50   set(M_LIBRARY "")
  51 endif()
  52
  53 # COMMAND LINE OPTIONS
  54 option(PNG_SHARED "Build shared lib" ON)
  55 option(PNG_STATIC "Build static lib" ON)
  56 option(PNG_TESTS  "Build libpng tests" ON)
  57
  58 # Many more configuration options could be added here
  59 option(PNG_FRAMEWORK "Build OS X framework" OFF)
  60 option(PNG_DEBUG "Build with debug output" OFF)
  61 option(PNG_HARDWARE_OPTIMIZATIONS "Enable hardware optimizations" ON)
  62
  63 set(PNG_PREFIX "" CACHE STRING "Prefix to add to the API function names")
  64 set(DFA_XTRA "" CACHE FILEPATH "File containing extra configuration settings")
  65
  66 if(PNG_HARDWARE_OPTIMIZATIONS)
  67
  68 # set definitions and sources for arm
  69 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" OR
  70   CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
  71   set(PNG_ARM_NEON_POSSIBLE_VALUES check on off)
  72   set(PNG_ARM_NEON "check" CACHE STRING "Enable ARM NEON optimizations:
  73      check: (default) use internal checking code;
  74      off: disable the optimizations;
  75      on: turn on unconditionally.")
  76   set_property(CACHE PNG_ARM_NEON PROPERTY STRINGS
  77      ${PNG_ARM_NEON_POSSIBLE_VALUES})
  78   list(FIND PNG_ARM_NEON_POSSIBLE_VALUES ${PNG_ARM_NEON} index)
  79   if(index EQUAL -1)
  80     message(FATAL_ERROR
  81             "PNG_ARM_NEON must be one of [${PNG_ARM_NEON_POSSIBLE_VALUES}]")
  82   elseif(NOT ${PNG_ARM_NEON} STREQUAL "off")
  83     set(libpng_arm_sources
  84       arm/arm_init.c
  85       arm/filter_neon.S
  86       arm/filter_neon_intrinsics.c
  87       arm/palette_neon_intrinsics.c)
  88
  89     if(${PNG_ARM_NEON} STREQUAL "on")
  90       add_definitions(-DPNG_ARM_NEON_OPT=2)
  91     elseif(${PNG_ARM_NEON} STREQUAL "check")
  92       add_definitions(-DPNG_ARM_NEON_CHECK_SUPPORTED)
  93     endif()
  94   else()
  95     add_definitions(-DPNG_ARM_NEON_OPT=0)
  96   endif()
  97 endif()
  98
  99 # set definitions and sources for powerpc
 100 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^powerpc*" OR
 101    CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*")
 102   set(PNG_POWERPC_VSX_POSSIBLE_VALUES on off)
 103   set(PNG_POWERPC_VSX "on" CACHE STRING "Enable POWERPC VSX optimizations:
 104      off: disable the optimizations.")
 105   set_property(CACHE PNG_POWERPC_VSX PROPERTY STRINGS
 106      ${PNG_POWERPC_VSX_POSSIBLE_VALUES})
 107   list(FIND PNG_POWERPC_VSX_POSSIBLE_VALUES ${PNG_POWERPC_VSX} index)
 108   if(index EQUAL -1)
 109     message(FATAL_ERROR
 110             "PNG_POWERPC_VSX must be one of [${PNG_POWERPC_VSX_POSSIBLE_VALUES}]")
 111   elseif(NOT ${PNG_POWERPC_VSX} STREQUAL "off")
 112     set(libpng_powerpc_sources
 113       powerpc/powerpc_init.c
 114       powerpc/filter_vsx_intrinsics.c)
 115     if(${PNG_POWERPC_VSX} STREQUAL "on")
 116       add_definitions(-DPNG_POWERPC_VSX_OPT=2)
 117     endif()
 118   else()
 119     add_definitions(-DPNG_POWERPC_VSX_OPT=0)
 120   endif()
 121 endif()
 122
 123 # set definitions and sources for intel
 124 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i?86" OR
 125    CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*")
 126   set(PNG_INTEL_SSE_POSSIBLE_VALUES on off)
 127   set(PNG_INTEL_SSE "on" CACHE STRING "Enable INTEL_SSE optimizations:
 128      off: disable the optimizations")
 129   set_property(CACHE PNG_INTEL_SSE PROPERTY STRINGS
 130      ${PNG_INTEL_SSE_POSSIBLE_VALUES})
 131   list(FIND PNG_INTEL_SSE_POSSIBLE_VALUES ${PNG_INTEL_SSE} index)
 132   if(index EQUAL -1)
 133     message(FATAL_ERROR
 134             "PNG_INTEL_SSE must be one of [${PNG_INTEL_SSE_POSSIBLE_VALUES}]")
 135   elseif(NOT ${PNG_INTEL_SSE} STREQUAL "off")
 136     set(libpng_intel_sources
 137       intel/intel_init.c
 138       intel/filter_sse2_intrinsics.c)
 139     if(${PNG_INTEL_SSE} STREQUAL "on")
 140       add_definitions(-DPNG_INTEL_SSE_OPT=1)
 141     endif()
 142   else()
 143     add_definitions(-DPNG_INTEL_SSE_OPT=0)
 144   endif()
 145 endif()
 146
 147 # set definitions and sources for MIPS
 148 if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
 149    CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*")
 150   set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
 151   set(PNG_MIPS_MSA "on" CACHE STRING "Enable MIPS_MSA optimizations:
 152      off: disable the optimizations")
 153   set_property(CACHE PNG_MIPS_MSA PROPERTY STRINGS
 154      ${PNG_MIPS_MSA_POSSIBLE_VALUES})
 155   list(FIND PNG_MIPS_MSA_POSSIBLE_VALUES ${PNG_MIPS_MSA} index)
 156   if(index EQUAL -1)
 157     message(FATAL_ERROR
 158             "PNG_MIPS_MSA must be one of [${PNG_MIPS_MSA_POSSIBLE_VALUES}]")
 159   elseif(NOT ${PNG_MIPS_MSA} STREQUAL "off")
 160     set(libpng_mips_sources
 161       mips/mips_init.c
 162       mips/filter_msa_intrinsics.c)
 163     if(${PNG_MIPS_MSA} STREQUAL "on")
 164       add_definitions(-DPNG_MIPS_MSA_OPT=2)
 165     endif()
 166   else()
 167     add_definitions(-DPNG_MIPS_MSA_OPT=0)
 168   endif()
 169 endif()
 170
 171 else(PNG_HARDWARE_OPTIMIZATIONS)
 172
 173 # set definitions and sources for arm
 174 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" OR
 175    CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
 176   add_definitions(-DPNG_ARM_NEON_OPT=0)
 177 endif()
 178
 179 # set definitions and sources for powerpc
 180 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^powerpc*" OR
 181    CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*")
 182   add_definitions(-DPNG_POWERPC_VSX_OPT=0)
 183 endif()
 184
 185 # set definitions and sources for intel
 186 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i?86" OR
 187    CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*")
 188   add_definitions(-DPNG_INTEL_SSE_OPT=0)
 189 endif()
 190
 191 # set definitions and sources for MIPS
 192 if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
 193    CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*")
 194   add_definitions(-DPNG_MIPS_MSA_OPT=0)
 195 endif()
 196
 197 endif(PNG_HARDWARE_OPTIMIZATIONS)
 198
 199 # SET LIBNAME
 200 set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
 201
 202 # to distinguish between debug and release lib
 203 set(CMAKE_DEBUG_POSTFIX "d")
 204
 205 include(CheckCSourceCompiles)
 206 option(ld-version-script "Enable linker version script" ON)
 207 if(ld-version-script AND NOT APPLE)
 208   # Check if LD supports linker scripts.
 209   file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map" "VERS_1 {
 210         global: sym;
 211         local: *;
 212 };
 213
 214 VERS_2 {
 215         global: sym2;
 216                 main;
 217 } VERS_1;
 218 ")
 219   set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
 220   set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/conftest.map'")
 221   check_c_source_compiles("void sym(void) {}
 222 void sym2(void) {}
 223 int main(void) {return 0;}
 224 " HAVE_LD_VERSION_SCRIPT)
 225   if(NOT HAVE_LD_VERSION_SCRIPT)
 226     set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE} "-Wl,-M -Wl,${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
 227   check_c_source_compiles("void sym(void) {}
 228 void sym2(void) {}
 229 int main(void) {return 0;}
 230 " HAVE_SOLARIS_LD_VERSION_SCRIPT)
 231   endif()
 232   set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE})
 233   file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
 234 endif()
 235
 236 # Find symbol prefix.  Likely obsolete and unnecessary with recent
 237 # toolchains (it's not done in many other projects).
 238 function(symbol_prefix)
 239   set(SYMBOL_PREFIX)
 240
 241   execute_process(COMMAND "${CMAKE_C_COMPILER}" "-E" "-"
 242                   INPUT_FILE /dev/null
 243                   OUTPUT_VARIABLE OUT
 244                   RESULT_VARIABLE STATUS)
 245
 246   if(CPP_FAIL)
 247     message(WARNING "Failed to run the C preprocessor")
 248   endif()
 249
 250   string(REPLACE "\n" ";" OUT "${OUT}")
 251   foreach(line ${OUT})
 252     string(REGEX MATCH "^PREFIX=" found_match "${line}")
 253     if(found_match)
 254       string(REGEX REPLACE "^PREFIX=(.*\)" "\\1" prefix "${line}")
 255       string(REGEX MATCH "__USER_LABEL_PREFIX__" found_match "${prefix}")
 256       if(found_match)
 257         string(REGEX REPLACE "(.*)__USER_LABEL_PREFIX__(.*)" "\\1\\2" prefix "${prefix}")
 258       endif()
 259       set(SYMBOL_PREFIX "${prefix}")
 260     endif()
 261   endforeach()
 262
 263   message(STATUS "Symbol prefix: ${SYMBOL_PREFIX}")
 264   set(SYMBOL_PREFIX "${SYMBOL_PREFIX}" PARENT_SCOPE)
 265 endfunction()
 266
 267 if(UNIX)
 268   symbol_prefix()
 269 endif()
 270
 271 find_program(AWK NAMES gawk awk)
 272
 273 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 274
 275 if(NOT AWK OR ANDROID)
 276   # No awk available to generate sources; use pre-built pnglibconf.h
 277   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
 278                  ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
 279   add_custom_target(genfiles) # Dummy
 280 else()
 281   include(CMakeParseArguments)
 282   # Generate .chk from .out with awk
 283   # generate_chk(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
 284   function(generate_chk)
 285     set(options)
 286     set(oneValueArgs INPUT OUTPUT)
 287     set(multiValueArgs DEPENDS)
 288     cmake_parse_arguments(_GC "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
 289     if(NOT _GC_INPUT)
 290       message(FATAL_ERROR "generate_chk: Missing INPUT argument")
 291     endif()
 292     if(NOT _GC_OUTPUT)
 293       message(FATAL_ERROR "generate_chk: Missing OUTPUT argument")
 294     endif()
 295
 296     add_custom_command(OUTPUT "${_GC_OUTPUT}"
 297                        COMMAND "${CMAKE_COMMAND}"
 298                                "-DINPUT=${_GC_INPUT}"
 299                                "-DOUTPUT=${_GC_OUTPUT}"
 300                                -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake"
 301                        DEPENDS "${_GC_INPUT}" ${_GC_DEPENDS}
 302                        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 303   endfunction()
 304
 305   # Generate .out from .c with awk
 306   # generate_out(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
 307   function(generate_out)
 308     set(options)
 309     set(oneValueArgs INPUT OUTPUT)
 310     set(multiValueArgs DEPENDS)
 311     cmake_parse_arguments(_GO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
 312     if(NOT _GO_INPUT)
 313       message(FATAL_ERROR "generate_out: Missing INPUT argument")
 314     endif()
 315     if(NOT _GO_OUTPUT)
 316       message(FATAL_ERROR "generate_out: Missing OUTPUT argument")
 317     endif()
 318
 319     add_custom_command(OUTPUT "${_GO_OUTPUT}"
 320                        COMMAND "${CMAKE_COMMAND}"
 321                                "-DINPUT=${_GO_INPUT}"
 322                                "-DOUTPUT=${_GO_OUTPUT}"
 323                                -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake"
 324                        DEPENDS "${_GO_INPUT}" ${_GO_DEPENDS}
 325                        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 326   endfunction()
 327
 328   # Generate specific source file with awk
 329   # generate_source(OUTPUT outputfile [DEPENDS dep1 [dep2...]])
 330   function(generate_source)
 331     set(options)
 332     set(oneValueArgs OUTPUT)
 333     set(multiValueArgs DEPENDS)
 334     cmake_parse_arguments(_GSO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
 335     if(NOT _GSO_OUTPUT)
 336       message(FATAL_ERROR "generate_source: Missing OUTPUT argument")
 337     endif()
 338
 339     add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_GSO_OUTPUT}"
 340                        COMMAND "${CMAKE_COMMAND}"
 341                                "-DOUTPUT=${_GSO_OUTPUT}"
 342                                -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
 343                        DEPENDS ${_GSO_DEPENDS}
 344                        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 345   endfunction()
 346
 347   # Copy file
 348   function(generate_copy source destination)
 349     add_custom_command(OUTPUT "${destination}"
 350                        COMMAND "${CMAKE_COMMAND}" -E remove "${destination}"
 351                        COMMAND "${CMAKE_COMMAND}" -E copy "${source}"
 352                                                           "${destination}"
 353                        DEPENDS "${source}")
 354   endfunction()
 355
 356   # Generate scripts/pnglibconf.h
 357   generate_source(OUTPUT "scripts/pnglibconf.c"
 358                   DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
 359                           "${CMAKE_CURRENT_SOURCE_DIR}/scripts/options.awk"
 360                           "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")
 361
 362   # Generate pnglibconf.c
 363   generate_source(OUTPUT "pnglibconf.c"
 364                   DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
 365                           "${CMAKE_CURRENT_SOURCE_DIR}/scripts/options.awk"
 366                           "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")
 367
 368   if(PNG_PREFIX)
 369     set(PNGLIBCONF_H_EXTRA_DEPENDS
 370         "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
 371         "${CMAKE_CURRENT_SOURCE_DIR}/scripts/macro.lst")
 372     set(PNGPREFIX_H_EXTRA_DEPENDS
 373         "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out")
 374   endif()
 375
 376   generate_out(INPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c"
 377                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out")
 378
 379   # Generate pnglibconf.h
 380   generate_source(OUTPUT "pnglibconf.h"
 381                   DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out"
 382                           ${PNGLIBCONF_H_EXTRA_DEPENDS})
 383
 384   generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/intprefix.c"
 385                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out"
 386                DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")
 387
 388   generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/prefix.c"
 389                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
 390                DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
 391                        "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
 392                        "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out")
 393
 394   # Generate pngprefix.h
 395   generate_source(OUTPUT "pngprefix.h"
 396                   DEPENDS ${PNGPREFIX_H_EXTRA_DEPENDS})
 397
 398   generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/sym.c"
 399                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
 400                DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")
 401
 402   generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.c"
 403                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
 404                DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
 405                        "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
 406                        "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt")
 407
 408   generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/vers.c"
 409                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
 410                DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
 411                        "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
 412                        "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")
 413
 414   generate_chk(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
 415                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk"
 416                DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/checksym.awk"
 417                        "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.def")
 418
 419   add_custom_target(symbol-check DEPENDS
 420                     "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk")
 421
 422   generate_copy("${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
 423                 "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")
 424   generate_copy("${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
 425                 "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")
 426
 427   add_custom_target(genvers DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")
 428   add_custom_target(gensym DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")
 429
 430   add_custom_target("genprebuilt"
 431                     COMMAND "${CMAKE_COMMAND}"
 432                             "-DOUTPUT=scripts/pnglibconf.h.prebuilt"
 433                             -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
 434                     WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 435
 436   # A single target handles generation of all generated files.  If
 437   # they are depended upon separately by multiple targets, this
 438   # confuses parallel make (it would require a separate top-level
 439   # target for each file to track the dependencies properly).
 440   add_custom_target(genfiles DEPENDS
 441     "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym"
 442     "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers"
 443     "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c"
 444     "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
 445     "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out"
 446     "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h"
 447     "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out"
 448     "${CMAKE_CURRENT_BINARY_DIR}/scripts/pnglibconf.c"
 449     "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
 450     "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
 451     "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk"
 452     "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
 453     "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out")
 454 endif(NOT AWK OR ANDROID)
 455
 456 # OUR SOURCES
 457 set(libpng_public_hdrs
 458   png.h
 459   pngconf.h
 460   "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
 461 )
 462 set(libpng_private_hdrs
 463   pngpriv.h
 464   pngdebug.h
 465   pnginfo.h
 466   pngstruct.h
 467 )
 468 if(AWK AND NOT ANDROID)
 469   list(APPEND libpng_private_hdrs "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h")
 470 endif()
 471 set(libpng_sources
 472   ${libpng_public_hdrs}
 473   ${libpng_private_hdrs}
 474   png.c
 475   pngerror.c
 476   pngget.c
 477   pngmem.c
 478   pngpread.c
 479   pngread.c
 480   pngrio.c
 481   pngrtran.c
 482   pngrutil.c
 483   pngset.c
 484   pngtrans.c
 485   pngwio.c
 486   pngwrite.c
 487   pngwtran.c
 488   pngwutil.c
 489   ${libpng_arm_sources}
 490   ${libpng_intel_sources}
 491   ${libpng_mips_sources}
 492   ${libpng_powerpc_sources}
 493 )
 494 set(pngtest_sources
 495   pngtest.c
 496 )
 497 set(pngvalid_sources
 498   contrib/libtests/pngvalid.c
 499 )
 500 set(pngstest_sources
 501   contrib/libtests/pngstest.c
 502 )
 503 set(pngunknown_sources
 504   contrib/libtests/pngunknown.c
 505 )
 506 set(pngimage_sources
 507   contrib/libtests/pngimage.c
 508 )
 509 set(pngfix_sources
 510   contrib/tools/pngfix.c
 511 )
 512 set(png_fix_itxt_sources
 513   contrib/tools/png-fix-itxt.c
 514 )
 515
 516 if(MSVC)
 517   add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
 518 endif()
 519
 520 if(PNG_DEBUG)
 521   add_definitions(-DPNG_DEBUG)
 522 endif()
 523
 524 # NOW BUILD OUR TARGET
 525 include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})
 526
 527 unset(PNG_LIB_TARGETS)
 528
 529 if(PNG_SHARED)
 530   add_library(png SHARED ${libpng_sources})
 531   set(PNG_LIB_TARGETS png)
 532   set_target_properties(png PROPERTIES OUTPUT_NAME ${PNG_LIB_NAME})
 533   add_dependencies(png genfiles)
 534   if(MSVC)
 535     # msvc does not append 'lib' - do it here to have consistent name
 536     set_target_properties(png PROPERTIES PREFIX "lib")
 537     set_target_properties(png PROPERTIES IMPORT_PREFIX "lib")
 538   endif()
 539   target_link_libraries(png ${ZLIB_LIBRARY} ${M_LIBRARY})
 540
 541   if(UNIX AND AWK)
 542     if(HAVE_LD_VERSION_SCRIPT)
 543       set_target_properties(png PROPERTIES LINK_FLAGS
 544         "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
 545     elseif(HAVE_SOLARIS_LD_VERSION_SCRIPT)
 546       set_target_properties(png PROPERTIES LINK_FLAGS
 547         "-Wl,-M -Wl,'${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
 548     endif()
 549   endif()
 550 endif()
 551
 552 if(PNG_STATIC)
 553   # does not work without changing name
 554   set(PNG_LIB_NAME_STATIC png_static)
 555   add_library(png_static STATIC ${libpng_sources})
 556   add_dependencies(png_static genfiles)
 557   # MSVC doesn't use a different file extension for shared vs. static
 558   # libs.  We are able to change OUTPUT_NAME to remove the _static
 559   # for all other platforms.
 560   if(NOT MSVC)
 561     set_target_properties(png_static PROPERTIES
 562       OUTPUT_NAME "${PNG_LIB_NAME}"
 563       CLEAN_DIRECT_OUTPUT 1)
 564   else()
 565     set_target_properties(png_static PROPERTIES
 566       OUTPUT_NAME "${PNG_LIB_NAME}_static"
 567       CLEAN_DIRECT_OUTPUT 1)
 568   endif()
 569   list(APPEND PNG_LIB_TARGETS png_static)
 570   if(MSVC)
 571     # msvc does not append 'lib' - do it here to have consistent name
 572     set_target_properties(png_static PROPERTIES PREFIX "lib")
 573   endif()
 574   target_link_libraries(png_static ${ZLIB_LIBRARY} ${M_LIBRARY})
 575 endif()
 576
 577 if(PNG_FRAMEWORK)
 578   set(PNG_LIB_NAME_FRAMEWORK png_framework)
 579   add_library(png_framework SHARED ${libpng_sources})
 580   add_dependencies(png_framework genfiles)
 581   list(APPEND PNG_LIB_TARGETS png_framework)
 582   set_target_properties(png_framework PROPERTIES
 583     FRAMEWORK TRUE
 584     FRAMEWORK_VERSION ${PNGLIB_VERSION}
 585     MACOSX_FRAMEWORK_SHORT_VERSION_STRING ${PNGLIB_MAJOR}.${PNGLIB_MINOR}
 586     MACOSX_FRAMEWORK_BUNDLE_VERSION ${PNGLIB_VERSION}
 587     MACOSX_FRAMEWORK_IDENTIFIER org.libpng.libpng
 588     XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
 589     PUBLIC_HEADER "${libpng_public_hdrs}"
 590     OUTPUT_NAME png)
 591   target_link_libraries(png_framework ${ZLIB_LIBRARY} ${M_LIBRARY})
 592 endif()
 593
 594 if(NOT PNG_LIB_TARGETS)
 595   message(SEND_ERROR
 596     "No library variant selected to build. "
 597     "Please enable at least one of the following options: "
 598     "PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
 599 endif()
 600
 601 if(PNG_SHARED AND WIN32)
 602   set_target_properties(png PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
 603 endif()
 604
 605 function(png_add_test)
 606   set(options)
 607   set(oneValueArgs NAME COMMAND)
 608   set(multiValueArgs OPTIONS FILES)
 609   cmake_parse_arguments(_PAT "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
 610
 611   if(NOT _PAT_NAME)
 612     message(FATAL_ERROR "png_add_test: Missing NAME argument")
 613   endif()
 614   if(NOT _PAT_COMMAND)
 615     message(FATAL_ERROR "png_add_test: Missing COMMAND argument")
 616   endif()
 617
 618   set(TEST_OPTIONS "${_PAT_OPTIONS}")
 619   set(TEST_FILES "${_PAT_FILES}")
 620
 621   configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scripts/test.cmake.in"
 622                  "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake" @ONLY)
 623   add_test(NAME "${_PAT_NAME}"
 624            COMMAND "${CMAKE_COMMAND}"
 625            "-DLIBPNG=$<TARGET_FILE:png>"
 626            "-DTEST_COMMAND=$<TARGET_FILE:${_PAT_COMMAND}>"
 627            -P "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake")
 628 endfunction()
 629
 630 if(PNG_TESTS AND PNG_SHARED)
 631   # Find test PNG files by globbing, but sort lists to ensure
 632   # consistency between different filesystems.
 633   file(GLOB PNGSUITE_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/*.png")
 634   list(SORT PNGSUITE_PNGS)
 635   file(GLOB TEST_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/testpngs/*.png")
 636   list(SORT TEST_PNGS)
 637
 638   set(PNGTEST_PNG "${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png")
 639
 640   add_executable(pngtest ${pngtest_sources})
 641   target_link_libraries(pngtest png)
 642
 643   png_add_test(NAME pngtest COMMAND pngtest FILES "${PNGTEST_PNG}")
 644
 645   add_executable(pngvalid ${pngvalid_sources})
 646   target_link_libraries(pngvalid png)
 647
 648   png_add_test(NAME pngvalid-gamma-16-to-8
 649                COMMAND pngvalid OPTIONS --gamma-16-to-8)
 650   png_add_test(NAME pngvalid-gamma-alpha-mode
 651                COMMAND pngvalid OPTIONS --gamma-alpha-mode)
 652   png_add_test(NAME pngvalid-gamma-background
 653                COMMAND pngvalid OPTIONS --gamma-background)
 654   png_add_test(NAME pngvalid-gamma-expand16-alpha-mode
 655                COMMAND pngvalid OPTIONS --gamma-alpha-mode --expand16)
 656   png_add_test(NAME pngvalid-gamma-expand16-background
 657                COMMAND pngvalid OPTIONS --gamma-background --expand16)
 658   png_add_test(NAME pngvalid-gamma-expand16-transform
 659                COMMAND pngvalid OPTIONS --gamma-transform --expand16)
 660   png_add_test(NAME pngvalid-gamma-sbit
 661                COMMAND pngvalid OPTIONS --gamma-sbit)
 662   png_add_test(NAME pngvalid-gamma-threshold
 663                COMMAND pngvalid OPTIONS --gamma-threshold)
 664   png_add_test(NAME pngvalid-gamma-transform
 665                COMMAND pngvalid OPTIONS --gamma-transform)
 666   png_add_test(NAME pngvalid-progressive-interlace-standard
 667                COMMAND pngvalid OPTIONS --standard --progressive-read --interlace)
 668   png_add_test(NAME pngvalid-progressive-size
 669                COMMAND pngvalid OPTIONS --size --progressive-read)
 670   png_add_test(NAME pngvalid-progressive-standard
 671                COMMAND pngvalid OPTIONS --standard --progressive-read)
 672   png_add_test(NAME pngvalid-standard
 673                COMMAND pngvalid OPTIONS --standard)
 674   png_add_test(NAME pngvalid-transform
 675                COMMAND pngvalid OPTIONS --transform)
 676
 677   add_executable(pngstest ${pngstest_sources})
 678   target_link_libraries(pngstest png)
 679
 680   foreach(gamma_type 1.8 linear none sRGB)
 681     foreach(alpha_type none alpha)
 682       set(PNGSTEST_FILES)
 683       foreach(test_png ${TEST_PNGS})
 684         string(REGEX MATCH ".*-linear[-.].*" TEST_PNG_LINEAR "${test_png}")
 685         string(REGEX MATCH ".*-sRGB[-.].*" TEST_PNG_SRGB "${test_png}")
 686         string(REGEX MATCH ".*-1.8[-.].*" TEST_PNG_G18 "${test_png}")
 687         string(REGEX MATCH ".*-alpha-.*" TEST_PNG_ALPHA "${test_png}")
 688
 689         set(TEST_PNG_VALID TRUE)
 690
 691         if(TEST_PNG_ALPHA)
 692           if(NOT "${alpha_type}" STREQUAL "alpha")
 693             set(TEST_PNG_VALID FALSE)
 694           endif()
 695         else()
 696           if("${alpha_type}" STREQUAL "alpha")
 697             set(TEST_PNG_VALID FALSE)
 698           endif()
 699         endif()
 700
 701         if(TEST_PNG_LINEAR)
 702           if(NOT "${gamma_type}" STREQUAL "linear")
 703             set(TEST_PNG_VALID FALSE)
 704           endif()
 705         elseif(TEST_PNG_SRGB)
 706           if(NOT "${gamma_type}" STREQUAL "sRGB")
 707             set(TEST_PNG_VALID FALSE)
 708           endif()
 709         elseif(TEST_PNG_G18)
 710           if(NOT "${gamma_type}" STREQUAL "1.8")
 711             set(TEST_PNG_VALID FALSE)
 712           endif()
 713         else()
 714           if(NOT "${gamma_type}" STREQUAL "none")
 715             set(TEST_PNG_VALID FALSE)
 716           endif()
 717         endif()
 718
 719         if(TEST_PNG_VALID)
 720           list(APPEND PNGSTEST_FILES "${test_png}")
 721         endif()
 722       endforeach()
 723       # Should already be sorted, but sort anyway to be certain.
 724       list(SORT PNGSTEST_FILES)
 725       png_add_test(NAME pngstest-${gamma_type}-${alpha_type}
 726                    COMMAND pngstest
 727                    OPTIONS --tmpfile "${gamma_type}-${alpha_type}-" --log
 728                    FILES ${PNGSTEST_FILES})
 729     endforeach()
 730   endforeach()
 731
 732   add_executable(pngunknown ${pngunknown_sources})
 733   target_link_libraries(pngunknown png)
 734
 735   png_add_test(NAME pngunknown-discard COMMAND pngunknown OPTIONS --strict default=discard FILES "${PNGTEST_PNG}")
 736   png_add_test(NAME pngunknown-IDAT COMMAND pngunknown OPTIONS --strict default=discard IDAT=save FILES "${PNGTEST_PNG}")
 737   png_add_test(NAME pngunknown-if-safe COMMAND pngunknown OPTIONS --strict default=if-safe FILES "${PNGTEST_PNG}")
 738   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 "${PNGTEST_PNG}")
 739   png_add_test(NAME pngunknown-save COMMAND pngunknown OPTIONS --strict default=save FILES "${PNGTEST_PNG}")
 740   png_add_test(NAME pngunknown-sTER COMMAND pngunknown OPTIONS --strict sTER=if-safe FILES "${PNGTEST_PNG}")
 741   png_add_test(NAME pngunknown-vpAg COMMAND pngunknown OPTIONS --strict vpAg=if-safe FILES "${PNGTEST_PNG}")
 742
 743   add_executable(pngimage ${pngimage_sources})
 744   target_link_libraries(pngimage png)
 745
 746   png_add_test(NAME pngimage-quick COMMAND pngimage OPTIONS --list-combos --log FILES ${PNGSUITE_PNGS})
 747   png_add_test(NAME pngimage-full COMMAND pngimage OPTIONS --exhaustive --list-combos --log FILES ${PNGSUITE_PNGS})
 748 endif()
 749
 750 if(PNG_SHARED)
 751   add_executable(pngfix ${pngfix_sources})
 752   target_link_libraries(pngfix png)
 753   set(PNG_BIN_TARGETS pngfix)
 754
 755   add_executable(png-fix-itxt ${png_fix_itxt_sources})
 756   target_link_libraries(png-fix-itxt ${ZLIB_LIBRARY} ${M_LIBRARY})
 757   list(APPEND PNG_BIN_TARGETS png-fix-itxt)
 758 endif()
 759
 760 # Set a variable with CMake code which:
 761 # Creates a symlink from src to dest (if possible) or alternatively
 762 # copies if different.
 763 include(CMakeParseArguments)
 764
 765 function(create_symlink DEST_FILE)
 766
 767   cmake_parse_arguments(S "" "FILE;TARGET" "" ${ARGN})
 768
 769   if(NOT S_TARGET AND NOT S_FILE)
 770     message(FATAL_ERROR "create_symlink: Missing TARGET or FILE argument")
 771   endif()
 772
 773   if(S_TARGET AND S_FILE)
 774     message(FATAL_ERROR "create_symlink: Both source file ${S_FILE} and build target ${S_TARGET} arguments are present; can only have one.")
 775   endif()
 776
 777   if(S_FILE)
 778     # If we don't need to symlink something that's coming from a build target,
 779     # we can go ahead and symlink/copy at configure time.
 780     if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
 781       execute_process(
 782         COMMAND "${CMAKE_COMMAND}" -E copy_if_different ${S_FILE} ${DEST_FILE}
 783         WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 784     else()
 785       execute_process(
 786         COMMAND ${CMAKE_COMMAND} -E create_symlink ${S_FILE} ${DEST_FILE}
 787         WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 788     endif()
 789   endif()
 790
 791   if(S_TARGET)
 792     # We need to use generator expressions, which can be a bit tricky, so for
 793     # simplicity make the symlink a POST_BUILD step and use the TARGET
 794     # signature of add_custom_command.
 795     if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
 796       add_custom_command(TARGET ${S_TARGET} POST_BUILD
 797         COMMAND "${CMAKE_COMMAND}" -E copy_if_different $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE})
 798     else()
 799       add_custom_command(TARGET ${S_TARGET} POST_BUILD
 800         COMMAND "${CMAKE_COMMAND}" -E create_symlink $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE})
 801     endif()
 802   endif()
 803
 804 endfunction()
 805
 806 # Create source generation scripts.
 807 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genchk.cmake.in
 808                ${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake @ONLY)
 809 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genout.cmake.in
 810                ${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake @ONLY)
 811 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/gensrc.cmake.in
 812                ${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake @ONLY)
 813
 814 # libpng is a library so default to 'lib'
 815 if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
 816   set(CMAKE_INSTALL_LIBDIR lib)
 817 endif()
 818
 819 # CREATE PKGCONFIG FILES
 820 # We use the same files like ./configure, so we have to set its vars.
 821 # Only do this on Windows for Cygwin - the files don't make much sense outside
 822 # of a UNIX look-alike.
 823 if(NOT WIN32 OR CYGWIN OR MINGW)
 824   set(prefix      ${CMAKE_INSTALL_PREFIX})
 825   set(exec_prefix ${CMAKE_INSTALL_PREFIX})
 826   set(libdir      ${CMAKE_INSTALL_FULL_LIBDIR})
 827   set(includedir  ${CMAKE_INSTALL_FULL_INCLUDEDIR})
 828   set(LIBS        "-lz -lm")
 829   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
 830     ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
 831   create_symlink(libpng.pc FILE ${PNGLIB_NAME}.pc)
 832
 833   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
 834     ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
 835   create_symlink(libpng-config FILE ${PNGLIB_NAME}-config)
 836 endif()
 837
 838 # SET UP LINKS
 839 if(PNG_SHARED)
 840   set_target_properties(png PROPERTIES
 841 #   VERSION 16.${PNGLIB_RELEASE}.1.6.37
 842     VERSION 16.${PNGLIB_RELEASE}.0
 843     SOVERSION 16
 844     CLEAN_DIRECT_OUTPUT 1)
 845 endif()
 846
 847 # INSTALL
 848 if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL)
 849   install(TARGETS ${PNG_LIB_TARGETS}
 850           EXPORT libpng
 851           RUNTIME DESTINATION bin
 852           LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
 853           ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
 854           FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR})
 855
 856   if(PNG_SHARED)
 857     # Create a symlink for libpng.dll.a => libpng16.dll.a on Cygwin
 858     if(CYGWIN OR MINGW)
 859       create_symlink(libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} TARGET png)
 860       install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX}
 861               DESTINATION ${CMAKE_INSTALL_LIBDIR})
 862     endif()
 863
 864     if(NOT WIN32)
 865       create_symlink(libpng${CMAKE_SHARED_LIBRARY_SUFFIX} TARGET png)
 866       install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
 867               DESTINATION ${CMAKE_INSTALL_LIBDIR})
 868     endif()
 869   endif()
 870
 871   if(PNG_STATIC)
 872     if(NOT WIN32 OR CYGWIN OR MINGW)
 873       create_symlink(libpng${CMAKE_STATIC_LIBRARY_SUFFIX} TARGET png_static)
 874       install(FILES $<TARGET_LINKER_FILE_DIR:png_static>/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
 875               DESTINATION ${CMAKE_INSTALL_LIBDIR})
 876     endif()
 877   endif()
 878 endif()
 879
 880 if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL)
 881   install(FILES ${libpng_public_hdrs} DESTINATION include)
 882   install(FILES ${libpng_public_hdrs} DESTINATION include/${PNGLIB_NAME})
 883 endif()
 884 if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL)
 885   if(NOT WIN32 OR CYGWIN OR MINGW)
 886     install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
 887     install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config DESTINATION bin)
 888   endif()
 889 endif()
 890
 891 if(NOT SKIP_INSTALL_PROGRAMS AND NOT SKIP_INSTALL_ALL)
 892   install(TARGETS ${PNG_BIN_TARGETS}
 893           RUNTIME DESTINATION bin)
 894 endif()
 895
 896 if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL)
 897   # Install man pages
 898   if(NOT PNG_MAN_DIR)
 899     set(PNG_MAN_DIR "share/man")
 900   endif()
 901   install(FILES libpng.3 libpngpf.3 DESTINATION ${PNG_MAN_DIR}/man3)
 902   install(FILES png.5 DESTINATION ${PNG_MAN_DIR}/man5)
 903   # Install pkg-config files
 904   if(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
 905     install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
 906             DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 907     install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
 908             DESTINATION bin)
 909     install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
 910             DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 911     install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
 912             DESTINATION bin)
 913   endif()
 914 endif()
 915
 916 # Create an export file that CMake users can include() to import our targets.
 917 if(NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL)
 918   install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
 919 endif()
 920
 921 # what's with libpng-manual.txt and all the extra files?
 922
 923 # UNINSTALL
 924 # do we need this?
 925
 926 # DIST
 927 # do we need this?
 928
 929 # to create msvc import lib for mingw compiled shared lib
 930 # pexports libpng.dll > libpng.def
 931 # lib /def:libpng.def /machine:x86