1# gensrc.cmake.in
  2# Generate source files with awk, based upon the automake logic.
  3
  4# Copyright (C) 2016 Glenn Randers-Pehrson
  5# Written by Roger Leigh, 2016
  6
  7# This code is released under the libpng license.
  8# For conditions of distribution and use, see the disclaimer
  9# and license in png.h
 10
 11# Variables substituted from CMakeLists.txt
 12set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
 13set(BINDIR "@CMAKE_CURRENT_BINARY_DIR@")
 14
 15set(AWK "@AWK@")
 16set(DFA_XTRA "@DFA_XTRA@")
 17set(PNG_PREFIX "@PNG_PREFIX@")
 18set(PNGLIB_VERSION "@PNGLIB_VERSION@")
 19
 20if("${OUTPUT}" STREQUAL "scripts/pnglibconf.c")
 21  # Generate scripts/pnglibconf.c
 22
 23  file(REMOVE "${BINDIR}/pnglibconf.tf6" "${BINDIR}/pnglibconf.tf7")
 24
 25  execute_process(COMMAND "${CMAKE_COMMAND}" -E echo "com ${PNGLIB_VERSION} STANDARD API DEFINITION"
 26                  COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
 27                          "out=pnglibconf.tf6" "logunsupported=1" "version=search"
 28                          "${SRCDIR}/pngconf.h" "-"
 29                          "${SRCDIR}/scripts/pnglibconf.dfa"
 30                  WORKING_DIRECTORY "${BINDIR}"
 31                  RESULT_VARIABLE AWK_FAIL)
 32  if(AWK_FAIL)
 33    message(FATAL_ERROR "Failed to generate pnglibconf.tf6")
 34  endif()
 35
 36  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
 37                  "out=pnglibconf.tf7" "pnglibconf.tf6"
 38                  WORKING_DIRECTORY "${BINDIR}"
 39                  RESULT_VARIABLE AWK_FAIL)
 40  if(AWK_FAIL)
 41    message(FATAL_ERROR "Failed to generate pnglibconf.tf7")
 42  endif()
 43
 44  file(REMOVE "pnglibconf.tf6")
 45  file(MAKE_DIRECTORY "${BINDIR}/scripts")
 46  file(RENAME "pnglibconf.tf7" "${BINDIR}/scripts/pnglibconf.c")
 47
 48elseif ("${OUTPUT}" STREQUAL "pnglibconf.c")
 49  # Generate pnglibconf.c
 50
 51  file(REMOVE "${BINDIR}/pnglibconf.tf4" "${BINDIR}/pnglibconf.tf5")
 52
 53  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
 54                  out=pnglibconf.tf4 version=search
 55                  ${SRCDIR}/pngconf.h ${SRCDIR}/scripts/pnglibconf.dfa
 56                  ${SRCDIR}/pngusr.dfa ${DFA_XTRA}
 57                  WORKING_DIRECTORY "${BINDIR}"
 58                  RESULT_VARIABLE AWK_FAIL)
 59  if(AWK_FAIL)
 60    message(FATAL_ERROR "Failed to generate pnglibconf.tf4")
 61  endif()
 62
 63  execute_process(COMMAND "${AWK}" -f "${SRCDIR}/scripts/options.awk"
 64                  out=pnglibconf.tf5 pnglibconf.tf4
 65                  WORKING_DIRECTORY "${BINDIR}"
 66                  RESULT_VARIABLE AWK_FAIL)
 67  if(AWK_FAIL)
 68    message(FATAL_ERROR "Failed to generate pnglibconf.tf5")
 69  endif()
 70
 71  file(REMOVE "pnglibconf.tf4")
 72  file(MAKE_DIRECTORY "${BINDIR}/scripts")
 73  file(RENAME "pnglibconf.tf5" "${BINDIR}/pnglibconf.c")
 74
 75elseif ("${OUTPUT}" STREQUAL "pnglibconf.h")
 76  # Generate pnglibconf.h
 77
 78  file(REMOVE "${BINDIR}/${OUTPUT}")
 79  if(PNG_PREFIX)
 80    file(REMOVE "pnglibconf.tf8")
 81
 82    execute_process(COMMAND "${AWK}" "s==0 && NR>1{print prev}
 83                             s==0{prev=\$0}
 84                             s==1{print \"#define\", \$1, \"${PNG_PREFIX}\" \$1}
 85                             s==2{print \"#define ${PNG_PREFIX}png_\" \$1, \"PNG_\" \$1}
 86                             END{print prev}" s=0 pnglibconf.out s=1 "${BINDIR}/scripts/prefix.out"
 87                             s=2 "${SRCDIR}/scripts/macro.lst"
 88                    OUTPUT_FILE pnglibconf.tf8
 89                    RESULT_VARIABLE AWK_FAIL)
 90    if(AWK_FAIL)
 91      message(FATAL_ERROR "Failed to generate pnglibconf.tf8")
 92    endif()
 93
 94    file(RENAME "pnglibconf.tf8" "${BINDIR}/${OUTPUT}")
 95  else()
 96    execute_process(COMMAND "${CMAKE_COMMAND}" -E copy "${BINDIR}/pnglibconf.out"
 97                                                       "${BINDIR}/${OUTPUT}"
 98                    RESULT_VARIABLE COPY_FAIL)
 99    if(COPY_FAIL)
100      message(FATAL_ERROR "Failed to create pnglibconf.h")
101    endif()
102  endif()
103
104elseif ("${OUTPUT}" STREQUAL "pngprefix.h")
105  # Generate pngprefix.h
106
107  file(REMOVE "${BINDIR}/${OUTPUT}")
108
109  if(PNG_PREFIX)
110    file(REMOVE "pngprefix.tf1")
111
112    execute_process(COMMAND "${AWK}"
113                            "{print \"#define\", \$1, \"${PNG_PREFIX}\" \$1}"
114                            "${BINDIR}/scripts/intprefix.out"
115                    OUTPUT_FILE "pngprefix.tf1"
116                    RESULT_VARIABLE AWK_FAIL)
117    if(AWK_FAIL)
118      message(FATAL_ERROR "Failed to generate pngprefix.tf1")
119    endif()
120
121    file(RENAME "pngprefix.tf1" "${BINDIR}/${OUTPUT}")
122  else()
123    file(WRITE "${BINDIR}/${OUTPUT}" "/* No libpng symbol prefix configured. */")
124  endif()
125
126elseif("${OUTPUT}" STREQUAL "scripts/pnglibconf.h.prebuilt")
127  # Generate scripts/pnglibconf.h.prebuilt (fails build)
128
129  message(STATUS "Attempting to build scripts/pnglibconf.h.prebuilt")
130  message(STATUS "This is a machine generated file, but if you want to make")
131  message(STATUS "a new one simply build the 'genfiles' target, and copy")
132  message(STATUS "scripts/pnglibconf.out to scripts/pnglibconf.h.prebuilt")
133  message(STATUS "AND set PNG_ZLIB_VERNUM to 0 (you MUST do this)")
134  message(FATAL_ERROR "Stopping build")
135
136else()
137  message(FATAL_ERROR "Unsupported output: ${OUTPUT}")
138endif()