+if(NOT AWK OR ANDROID)
+ # 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}" ${ARGN})
+ if(NOT _GC_INPUT)
+ message(FATAL_ERROR "generate_chk: Missing INPUT argument")
+ endif()
+ if(NOT _GC_OUTPUT)
+ message(FATAL_ERROR "generate_chk: Missing OUTPUT argument")
+ endif()
+
+ add_custom_command(OUTPUT "${_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}" ${ARGN})
+ if(NOT _GO_INPUT)
+ message(FATAL_ERROR "generate_out: Missing INPUT argument")
+ endif()
+ if(NOT _GO_OUTPUT)
+ message(FATAL_ERROR "generate_out: Missing OUTPUT argument")
+ endif()
+
+ add_custom_command(OUTPUT "${_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}" ${ARGN})
+ if(NOT _GSO_OUTPUT)
+ message(FATAL_ERROR "generate_source: Missing OUTPUT argument")
+ endif()
+
+ add_custom_command(OUTPUT "${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
+ # they are depended upon separately by multiple targets, this
+ # 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")
+endif(NOT AWK OR ANDROID)
+