bootstrap - automake - Git at Google

 #! /bin/sh
 # This script helps bootstrap automake, when checked out from git.
 # It should not be run from a tree made from a (pre)release tarball.
 #
 # Copyright (C) 2002-2026 Free Software Foundation, Inc.
 # Originally written by Pavel Roskin <proski@gnu.org> September 2002.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2, or (at your option)
 # any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.

 # Since Automake uses itself in its build process, we can't simply run
 # 'autoreconf -i' which would require Automake to already be
 # installed.

 if test ! -d .git; then
   cat <<END_NOT_GIT >&2
 $0: no .git directory, so exiting.
 Long-winded explanation:

 The Automake bootstrap script is intended to be run only from the
 top level of a git checkout of Automake, but no .git directory
 is present (in `pwd`), so I'm exiting.

 In particular, it should not be run from a source tree expanded from a
 release (or test release, etc.) tarball, because those trees already
 contain everything needed for compilation, with minimal dependencies.
 The development-specific actions of this bootstrap script will mess that
 up, e.g., makeinfo will be required to build after running bootstrap.

 (By the way, this bootstrap script is still included in the release
 tarballs even though it is not intended to be run in that context simply
 because it is a nontrivial source file and thus potentially useful to
 developers to see, regardless.)

 If you desire to run the bootstrap script in some tree that is not a git
 checkout, just mkdir .git and the script will proceed.

 Goodbye from $0.
 END_NOT_GIT
   exit 1
 fi

 # Don't ignore failures.
 set -e

 # Set program basename.
 me=`echo "$0" | sed 's,^.*/,,'`

 # Let user choose which version of autoconf, autom4te and perl to use.
 : ${AUTOCONF=autoconf}
 export AUTOCONF  # might be used by aclocal and/or automake
 : ${AUTOM4TE=autom4te}
 export AUTOM4TE  # ditto
 : ${PERL=perl}

 # Variables to substitute.
 VERSION=`sed -ne '/AC_INIT/s/^[^[]*\[[^[]*\[\([^]]*\)\].*$/\1/p' configure.ac`
 APIVERSION=`sed -n 's/^APIVERSION=//p' configure.ac`
 PACKAGE=automake
 datadir=.
 # This should be automatically updated by the 'update-copyright'
 # rule of our Makefile.
 RELEASE_YEAR=2026

 # Override SHELL.  This is required on DJGPP so that Perl's system()
 # uses bash, not COMMAND.COM which doesn't quote arguments properly.
 # It's not used otherwise.
 if test -n "$DJDIR"; then
   BOOTSTRAP_SHELL=/dev/env/DJDIR/bin/bash.exe
 else
   BOOTSTRAP_SHELL=/bin/sh
 fi

 # Sanity checks.
 if test -z "$VERSION"; then
   echo "$me: cannot find VERSION" >&2
   exit 1
 fi

 if test -z "$APIVERSION"; then
   echo "$me: cannot find APIVERSION" >&2
   exit 1
 fi

 # Make a dummy versioned directory for aclocal.
 rm -rf aclocal-$APIVERSION
 mkdir aclocal-$APIVERSION
 if test -d automake-$APIVERSION; then
   find automake-$APIVERSION -exec chmod u+wx '{}' ';'
 fi
 rm -rf automake-$APIVERSION
 # Can't use "ln -s lib automake-$APIVERSION", that would create a
 # lib.exe stub under DJGPP 2.03.
 mkdir automake-$APIVERSION
 cp -rf lib/* automake-$APIVERSION

 dosubst ()
 {
   rm -f $2
   in=`echo $1 | sed 's,^.*/,,'`
   sed -e "s%@APIVERSION@%$APIVERSION%g" \
       -e "s%@PACKAGE@%$PACKAGE%g" \
       -e "s%@PERL@%$PERL%g" \
       -e "s%@SHELL@%$BOOTSTRAP_SHELL%g" \
       -e "s%@VERSION@%$VERSION%g" \
       -e "s%@datadir@%$datadir%g" \
       -e "s%@RELEASE_YEAR@%$RELEASE_YEAR%g" \
       -e "s%@configure_input@%Generated from $in; do not edit by hand.%g" \
       $1 > $2
   chmod a-w $2
 }

 # Create temporary replacement for lib/Automake/Config.pm.
 dosubst automake-$APIVERSION/Automake/Config.in \
         automake-$APIVERSION/Automake/Config.pm

 # Overwrite amversion.m4.
 dosubst m4/amversion.in m4/amversion.m4

 # Create temporary replacement for aclocal and automake.
 dosubst bin/aclocal.in bin/aclocal.tmp
 dosubst bin/automake.in bin/automake.tmp

 # Create required makefile snippets.
 $PERL ./gen-testsuite-part > t/testsuite-part.tmp
 chmod a-w t/testsuite-part.tmp
 mv -f t/testsuite-part.tmp t/testsuite-part.am

 # Run the autotools.  Bail out if any warning is triggered.
 # Use '-I' here so that our own *.m4 files in m4/ gets included,
 # not copied, in aclocal.m4.
 $PERL ./bin/aclocal.tmp -Wall -Werror -I m4 \
                         --automake-acdir=m4 --system-acdir=m4/acdir
 $AUTOCONF -Wall -Werror
 $PERL ./bin/automake.tmp -Wall -Werror

 # Remove temporary files and directories.
 rm -rf aclocal-$APIVERSION automake-$APIVERSION
 rm -f bin/aclocal.tmp bin/automake.tmp
	#! /bin/sh
	# This script helps bootstrap automake, when checked out from git.
	# It should not be run from a tree made from a (pre)release tarball.
	#
	# Copyright (C) 2002-2026 Free Software Foundation, Inc.
	# Originally written by Pavel Roskin <proski@gnu.org> September 2002.
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation; either version 2, or (at your option)
	# any later version.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <https://www.gnu.org/licenses/>.

	# Since Automake uses itself in its build process, we can't simply run
	# 'autoreconf -i' which would require Automake to already be
	# installed.

	if test ! -d .git; then
	cat <<END_NOT_GIT >&2
	$0: no .git directory, so exiting.
	Long-winded explanation:

	The Automake bootstrap script is intended to be run only from the
	top level of a git checkout of Automake, but no .git directory
	is present (in `pwd`), so I'm exiting.

	In particular, it should not be run from a source tree expanded from a
	release (or test release, etc.) tarball, because those trees already
	contain everything needed for compilation, with minimal dependencies.
	The development-specific actions of this bootstrap script will mess that
	up, e.g., makeinfo will be required to build after running bootstrap.

	(By the way, this bootstrap script is still included in the release
	tarballs even though it is not intended to be run in that context simply
	because it is a nontrivial source file and thus potentially useful to
	developers to see, regardless.)

	If you desire to run the bootstrap script in some tree that is not a git
	checkout, just mkdir .git and the script will proceed.

	Goodbye from $0.
	END_NOT_GIT
	exit 1
	fi

	# Don't ignore failures.
	set -e

	# Set program basename.
	me=`echo "$0" \| sed 's,^.*/,,'`

	# Let user choose which version of autoconf, autom4te and perl to use.
	: ${AUTOCONF=autoconf}
	export AUTOCONF # might be used by aclocal and/or automake
	: ${AUTOM4TE=autom4te}
	export AUTOM4TE # ditto
	: ${PERL=perl}

	# Variables to substitute.
	VERSION=`sed -ne '/AC_INIT/s/^[^[]\[[^[]\[\([^]]\)\].$/\1/p' configure.ac`
	APIVERSION=`sed -n 's/^APIVERSION=//p' configure.ac`
	PACKAGE=automake
	datadir=.
	# This should be automatically updated by the 'update-copyright'
	# rule of our Makefile.
	RELEASE_YEAR=2026

	# Override SHELL. This is required on DJGPP so that Perl's system()
	# uses bash, not COMMAND.COM which doesn't quote arguments properly.
	# It's not used otherwise.
	if test -n "$DJDIR"; then
	BOOTSTRAP_SHELL=/dev/env/DJDIR/bin/bash.exe
	else
	BOOTSTRAP_SHELL=/bin/sh
	fi

	# Sanity checks.
	if test -z "$VERSION"; then
	echo "$me: cannot find VERSION" >&2
	exit 1
	fi

	if test -z "$APIVERSION"; then
	echo "$me: cannot find APIVERSION" >&2
	exit 1
	fi

	# Make a dummy versioned directory for aclocal.
	rm -rf aclocal-$APIVERSION
	mkdir aclocal-$APIVERSION
	if test -d automake-$APIVERSION; then
	find automake-$APIVERSION -exec chmod u+wx '{}' ';'
	fi
	rm -rf automake-$APIVERSION
	# Can't use "ln -s lib automake-$APIVERSION", that would create a
	# lib.exe stub under DJGPP 2.03.
	mkdir automake-$APIVERSION
	cp -rf lib/* automake-$APIVERSION

	dosubst ()
	{
	rm -f $2
	in=`echo $1 \| sed 's,^.*/,,'`
	sed -e "s%@APIVERSION@%$APIVERSION%g" \
	-e "s%@PACKAGE@%$PACKAGE%g" \
	-e "s%@PERL@%$PERL%g" \
	-e "s%@SHELL@%$BOOTSTRAP_SHELL%g" \
	-e "s%@VERSION@%$VERSION%g" \
	-e "s%@datadir@%$datadir%g" \
	-e "s%@RELEASE_YEAR@%$RELEASE_YEAR%g" \
	-e "s%@configure_input@%Generated from $in; do not edit by hand.%g" \
	$1 > $2
	chmod a-w $2
	}

	# Create temporary replacement for lib/Automake/Config.pm.
	dosubst automake-$APIVERSION/Automake/Config.in \
	automake-$APIVERSION/Automake/Config.pm

	# Overwrite amversion.m4.
	dosubst m4/amversion.in m4/amversion.m4

	# Create temporary replacement for aclocal and automake.
	dosubst bin/aclocal.in bin/aclocal.tmp
	dosubst bin/automake.in bin/automake.tmp

	# Create required makefile snippets.
	$PERL ./gen-testsuite-part > t/testsuite-part.tmp
	chmod a-w t/testsuite-part.tmp
	mv -f t/testsuite-part.tmp t/testsuite-part.am

	# Run the autotools. Bail out if any warning is triggered.
	# Use '-I' here so that our own *.m4 files in m4/ gets included,
	# not copied, in aclocal.m4.
	$PERL ./bin/aclocal.tmp -Wall -Werror -I m4 \
	--automake-acdir=m4 --system-acdir=m4/acdir
	$AUTOCONF -Wall -Werror
	$PERL ./bin/automake.tmp -Wall -Werror

	# Remove temporary files and directories.
	rm -rf aclocal-$APIVERSION automake-$APIVERSION
	rm -f bin/aclocal.tmp bin/automake.tmp