share/png/autogen.sh

   1 #! /bin/sh
   2 #
   3 # Run 'autoreconf' to build 'configure', 'Makefile.in' and other configure
   4 # control files.
   5 #
   6 # The first time this is run on a GIT checkout the only files that exist are
   7 # configure.ac and Makefile.am; all of the autotools support scripts are
   8 # missing.  They are instantiated with autoreconf --force --install.
   9 #
  10 # For regular ("tarball") distributions all the files should exist.  We do not
  11 # want them to be updated *under any circumstances*.  It should never be
  12 # necessary to run autogen.sh because ./configure --enable-maintainer-mode says
  13 # what to do if Makefile.am or configure.ac are changed.
  14 #
  15 # It is *probably* OK to update the files on a GIT checkout, because they have
  16 # come from the local tools, but leave that to the user who is assumed to know
  17 # whether it is ok or required.
  18 #
  19 # This script is intended to work without arguments, there are, however, hidden
  20 # arguments (a) for use while testing the script and (b) to fix up systems that
  21 # have been broken.  If (b) is required the script prompts for the correct
  22 # options.  For this reason the options are *NOT* documented in the help; this
  23 # is deliberate; UTSL.
  24 #
  25 clean=
  26 maintainer=
  27 while test $# -gt 0
  28 do
  29    case "$1" in
  30       --maintainer)
  31          maintainer=1;;
  32
  33       --clean)
  34          clean=1;;
  35
  36       *)
  37          exec >&2
  38          echo "$0: usage: ./autogen.sh"
  39          if test -d .git
  40          then
  41             echo "  ./autogen.sh generates the configure script and"
  42             echo "  Makefile.in, or refreshes them after changes to Makefile.am"
  43             echo "  or configure.ac.  You may prefer to just run autoreconf."
  44          elif test -z "$maintainer"
  45          then
  46             echo "  DO NOT RUN THIS SCRIPT."
  47             echo "  If you need to change Makefile.am or configure.ac then you"
  48             echo "  also need to run ./configure --enable-maintainer-mode and"
  49             echo "  use the appropriate autotools, *NOT* this script, to update"
  50             echo "  everything, please check the documentation of autoreconf."
  51             echo "  WARNING: libpng is intentionally generated with a known,"
  52             echo "  fixed, set of autotools.  It is known *NOT* to work with"
  53             echo "  the collection of autotools distributed on highly reputable"
  54             echo "  operating systems."
  55             echo "  Remember: autotools is GNU software, you are expected to"
  56             echo "  pay for support."
  57          else
  58             echo "  You have run autogen.sh with --maintainer enabled and you"
  59             echo "  are not using a GIT distribution, then you have given an"
  60             echo "  unrecognized argument.  This is not good. --maintainer"
  61             echo "  switches off any assumptions that you might not know what"
  62             echo "  you are doing."
  63          fi
  64          exit 1;;
  65    esac
  66
  67    shift
  68 done
  69 #
  70 # First check for a set of the autotools files; if absent then this is assumed
  71 # to be a GIT version and the local autotools must be used.  If present this
  72 # is a tarball distribution and the script should not be used.  If partially
  73 # present bad things are happening.
  74 #
  75 # The autotools generated files:
  76 libpng_autotools_files="Makefile.in aclocal.m4 config.guess config.h.in\
  77    config.sub configure depcomp install-sh ltmain.sh missing test-driver"
  78 #
  79 # Files generated by versions of configue >2.68 or automake >1.13 (i.e. later
  80 # versions than those required by configure.ac):
  81 libpng_autotools_extra="compile"
  82 #
  83 # These are separate because 'maintainer-clean' does not remove them.
  84 libpng_libtool_files="scripts/libtool.m4 scripts/ltoptions.m4\
  85    scripts/ltsugar.m4 scripts/ltversion.m4 scripts/lt~obsolete.m4"
  86
  87 libpng_autotools_dirs="autom4te.cache" # not required
  88 #
  89 # The configure generated files:
  90 libpng_configure_files="Makefile config.h config.log config.status\
  91    libpng-config libpng.pc libtool stamp-h1"
  92
  93 libpng_configure_dirs=".deps"
  94 #
  95 # We must remove the configure generated files as well as the autotools
  96 # generated files if autotools are regenerated because otherwise if configure
  97 # has been run without "--enable-maintainer-mode" make can do a partial update
  98 # of Makefile.  These functions do the two bits of cleaning.
  99 clean_autotools(){
 100    rm -rf $libpng_autotools_files $libpng_libtool_files $libpng_autotools_dirs
 101    rm -rf $libpng_autotools_extra
 102 }
 103
 104 clean_configure(){
 105    rm -rf $libpng_configure_files $libpng_configure_dirs
 106 }
 107 #
 108 # Clean: remove everything (this is to help with testing)
 109 if test -n "$clean"
 110 then
 111    clean_configure
 112    if test -n "$maintainer"
 113    then
 114       clean_autotools
 115    fi
 116
 117    exit 0
 118 fi
 119 #
 120 # Validate the distribution.
 121 libpng_autotools_file_found=
 122 libpng_autotools_file_missing=
 123 for file in $libpng_autotools_files
 124 do
 125    if test -f  "$file"
 126    then
 127       libpng_autotools_file_found=1
 128    else
 129       libpng_autotools_file_missing=1
 130    fi
 131 done
 132 #
 133 # Presence of one of these does not *invalidate* missing, but absence
 134 # invalidates found.
 135 for file in $libpng_libtool_files
 136 do
 137    if test ! -f "$file"
 138    then
 139       libpng_autotools_file_missing=1
 140    fi
 141 done
 142 #
 143 # The cache directory doesn't matter - it will be regenerated and does not exist
 144 # anyway in a tarball.
 145 #
 146 # Either everything is missing or everything is there, the --maintainer option
 147 # just changes this so that the mode is set to generate all the files.
 148 mode=
 149 if test -z "$libpng_autotools_file_found" -o -n "$maintainer"
 150 then
 151    mode="autoreconf"
 152 else
 153    if test -n "$libpng_autotools_file_missing"
 154    then
 155       mode="broken"
 156    else
 157       mode="configure"
 158    fi
 159 fi
 160 #
 161 # So:
 162 case "$mode" in
 163    autoreconf)
 164       # Clean in case configure files exist
 165       clean_configure
 166       clean_autotools
 167       # Everything must be initialized, so use --force
 168       if autoreconf --warnings=all --force --install
 169       then
 170          missing=
 171          for file in $libpng_autotools_files
 172          do
 173             test -f "$file" || missing=1
 174          done
 175          # ignore the cache directory
 176          test -z "$missing" || {
 177             exec >&2
 178             echo "autoreconf was run, but did not produce all the expected"
 179             echo "files.  It is likely that your autotools installation is"
 180             echo "not compatible with that expected by libpng."
 181             exit 1
 182          }
 183       else
 184          exec >&2
 185          echo "autoreconf failed: your version of autotools is incompatible"
 186          echo "with this libpng version.  Please use a distributed archive"
 187          echo "(which includes the autotools generated files) and run configure"
 188          echo "instead."
 189          exit 1
 190       fi;;
 191
 192    configure)
 193       if test -d .git
 194       then
 195          exec >&2
 196          echo "ERROR: running autoreconf on an initialized sytem"
 197          echo "  This is not necessary; it is only necessary to remake the"
 198          echo "  autotools generated files if Makefile.am or configure.ac"
 199          echo "  change and make does the right thing with:"
 200          echo
 201          echo "     ./configure --enable-maintainer-mode."
 202          echo
 203          echo "  You can run autoreconf yourself if you don't like maintainer"
 204          echo "  mode and you can also just run autoreconf -f -i to initialize"
 205          echo "  everything in the first place; this script is only for"
 206          echo "  compatibility with prior releases."
 207          exit 1
 208       else
 209          exec >&2
 210          echo "autogen.sh is intended only to generate 'configure' on systems"
 211          echo "that do not have it.  You have a complete 'configure', if you"
 212          echo "need to change Makefile.am or configure.ac you also need to"
 213          echo "run configure with the --enable-maintainer-mode option."
 214          exit 1
 215       fi;;
 216
 217    broken)
 218       exec >&2
 219       echo "Your system has a partial set of autotools generated files."
 220       echo "autogen.sh is unable to proceed.  The full set of files is"
 221       echo "contained in the libpng 'tar' distribution archive and you do"
 222       echo "not need to run autogen.sh if you use it."
 223       exit 1;;
 224 esac