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#
25clean=
26maintainer=
27while test $# -gt 0
28do
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
68done
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:
76libpng_autotools_files="Makefile.in aclocal.m4 config.guess config.h.in
77   config.sub configure depcomp install-sh ltmain.sh missing\
78   test-driver"
79#
80# Files generated by versions of configue >2.68 or automake >1.13 (i.e. later
81# versions than those required by configure.ac):
82libpng_autotools_extra="compile config.h.in~"
83#
84# These are separate because 'maintainer-clean' does not remove them.
85libpng_libtool_files="scripts/libtool.m4 scripts/ltoptions.m4\
86   scripts/ltsugar.m4 scripts/ltversion.m4 scripts/lt~obsolete.m4"
87
88libpng_autotools_dirs="autom4te.cache" # not required
89#
90# The configure generated files:
91libpng_configure_files="Makefile config.h config.log config.status\
92   libpng-config libpng.pc libtool stamp-h1"
93
94libpng_configure_dirs=".deps"
95#
96# We must remove the configure generated files as well as the autotools
97# generated files if autotools are regenerated because otherwise if configure
98# has been run without "--enable-maintainer-mode" make can do a partial update
99# of Makefile.  These functions do the two bits of cleaning.
100clean_autotools(){
101   rm -rf $libpng_autotools_files $libpng_libtool_files $libpng_autotools_dirs
102   rm -rf $libpng_autotools_extra
103}
104
105clean_configure(){
106   rm -rf $libpng_configure_files $libpng_configure_dirs
107}
108#
109# Clean: remove everything (this is to help with testing)
110if test -n "$clean"
111then
112   clean_configure
113   if test -n "$maintainer"
114   then
115      clean_autotools
116   fi
117
118   exit 0
119fi
120#
121# Validate the distribution.
122libpng_autotools_file_found=
123libpng_autotools_file_missing=
124for file in $libpng_autotools_files
125do
126   if test -f  "$file"
127   then
128      libpng_autotools_file_found=1
129   else
130      libpng_autotools_file_missing=1
131   fi
132done
133#
134# Presence of one of these does not *invalidate* missing, but absence
135# invalidates found.
136for file in $libpng_libtool_files
137do
138   if test ! -f "$file"
139   then
140      libpng_autotools_file_missing=1
141   fi
142done
143#
144# The cache directory doesn't matter - it will be regenerated and does not exist
145# anyway in a tarball.
146#
147# Either everything is missing or everything is there, the --maintainer option
148# just changes this so that the mode is set to generate all the files.
149mode=
150if test -z "$libpng_autotools_file_found" -o -n "$maintainer"
151then
152   mode="autoreconf"
153else
154   if test -n "$libpng_autotools_file_missing"
155   then
156      mode="broken"
157   else
158      mode="configure"
159   fi
160fi
161#
162# So:
163case "$mode" in
164   autoreconf)
165      # Clean in case configure files exist
166      clean_configure
167      clean_autotools
168      # Everything must be initialized, so use --force
169      if autoreconf --warnings=all --force --install
170      then
171         missing=
172         for file in $libpng_autotools_files
173         do
174            test -f "$file" || missing=1
175         done
176         # ignore the cache directory
177         test -z "$missing" || {
178            exec >&2
179            echo "autoreconf was run, but did not produce all the expected"
180            echo "files.  It is likely that your autotools installation is"
181            echo "not compatible with that expected by libpng."
182            exit 1
183         }
184      else
185         exec >&2
186         echo "autoreconf failed: your version of autotools is incompatible"
187         echo "with this libpng version.  Please use a distributed archive"
188         echo "(which includes the autotools generated files) and run configure"
189         echo "instead."
190         exit 1
191      fi;;
192
193   configure)
194      if test -d .git
195      then
196         exec >&2
197         echo "ERROR: running autoreconf on an initialized sytem"
198         echo "  This is not necessary; it is only necessary to remake the"
199         echo "  autotools generated files if Makefile.am or configure.ac"
200         echo "  change and make does the right thing with:"
201         echo
202         echo "     ./configure --enable-maintainer-mode."
203         echo
204         echo "  You can run autoreconf yourself if you don't like maintainer"
205         echo "  mode and you can also just run autoreconf -f -i to initialize"
206         echo "  everything in the first place; this script is only for"
207         echo "  compatibility with prior releases."
208         exit 1
209      else
210         exec >&2
211         echo "autogen.sh is intended only to generate 'configure' on systems"
212         echo "that do not have it.  You have a complete 'configure', if you"
213         echo "need to change Makefile.am or configure.ac you also need to"
214         echo "run configure with the --enable-maintainer-mode option."
215         exit 1
216      fi;;
217
218   broken)
219      exec >&2
220      echo "Your system has a partial set of autotools generated files."
221      echo "autogen.sh is unable to proceed.  The full set of files is"
222      echo "contained in the libpng 'tar' distribution archive and you do"
223      echo "not need to run autogen.sh if you use it."
224      exit 1;;
225esac
226