#!/bin/sh

########################################################################
# bootstrap script for UPC runtime autoconf/automake framework
#
# Assumes you wish to store autoconf temp files in a 'config-aux'
# subdirectory:  make sure you add 
#
#   AC_CONFIG_AUX_DIR(config-aux)
#
# to your configure.in files (or nothing works), and 
#
#   EXTRA_DIST      = $(top_builddir)/config-aux
#
# to your Makefile.am (or 'make dist' won't work).
#
########################################################################

TIME=
NOTOOLCHECK=0
autofilter="perl -0 -pe 's/^(autoheader.*?: )?WARN.+auxiliary files(.|\n)+WARN.+documentation.\n//m' \
	  	 | perl -pe 's/^.*?AC_PROG_LEX invoked multiple times.*?\n?$//g' \
	  	 | perl -0 -pe 's/^((.*?AC_CONFIG_SUBDIRS.*?\n)+([^ ]* the top level\n)?)*//g'"
srcdir=`dirname $0`

for arg in "$@"; do
  case "$arg" in
    -h) echo "Usage: $0 [options]"
        echo " -v  verbose mode: don't filter benign warnings from autotool output"
        echo " -t  time autotool commands"
        echo " -n  no checks for autotool presence and versions"
        echo " -T  touch Bootstrap-generated files to make them appear up-to-date"
	exit 1
        ;;
    -v) autofilter=cat ;;
    -n) NOTOOLCHECK=1 ;;
    -T) DOTOUCH=1 ;;
    -t) TIME='/usr/bin/time'
        if test ! -x "$TIME" ; then
          TIME=
        fi
        ;;
    *) ;; # ignore unrecognized args
  esac
done

DOIT='echo "+ $CMD | \$autofilter" ; ( eval $TIME $CMD 2>&1 || kill $$ ) | eval $autofilter'
# ; if test "$PIPESTATUS" != "" -a "$PIPESTATUS" != "0" ; then exit 1 ; fi'

if [ "$DOTOUCH" = 1 ]; then
    if [   -r $srcdir/upcr_config.h.in \
        -a -r $srcdir/Makefile.in \
        -a -r $srcdir/aclocal.m4 \
        -a -r $srcdir/configure \
    ]; then
        $srcdir/gasnet/Bootstrap -T || exit 1
        echo "Touching Bootstrap-generated files in $srcdir to make them appear up-to-date"
        cd $srcdir
        touch aclocal.m4
        sleep 2
        touch configure upcr_config.h.in
        sleep 2
        perl -ane 'utime undef, undef, (grep {m/\bMakefile\.in$/ && -f $_} @F);' -- unBootstrap
        exit 0;
    else
        echo "Can't touch generated files because this tree does not appear to be Bootstrapped"
        exit 1;
    fi
fi

if test "$NOTOOLCHECK" != "1" ; then
missing=
for autotool in autoconf autoheader automake aclocal m4 ; do
  info=`( $autotool --version 2>/dev/null < /dev/null || echo 'Not found' ) | head -1`
  if test "$info" != "Not found" ; then
    info="$info, in `which $autotool`"
  elif test "$autotool" != "m4" ; then
    missing="$missing$autotool "
  fi
  echo "$autotool:	$info"
done
if test "$missing" != ""; then
  echo "The following GNU autotools are missing from your PATH:"
  echo "   $missing"
  if test -r $srcdir/upcr_config.h.in \
    -a -r $srcdir/Makefile.in \
    -a -r $srcdir/aclocal.m4 \
    -a -r $srcdir/configure ; then
    echo "However, it appears this directory has already been Bootstrapped."
    echo "You should skip Bootstrap and instead do: configure ; gmake"
  else
    echo "Please download them from ftp://ftp.gnu.org/gnu"
  fi
  exit 1
fi
fi

set -e
set -x 

cd $srcdir

./unBootstrap

# Bootstrap gasnet first to ensure correct timestamps for the m4 macro files we rely upon
echo ------------  running GASNet Bootstrap --------------
( cd gasnet && ./Bootstrap -y -n "$@" || kill $$ )
echo -----------------------------------------------------

set +x

CMD="aclocal -I gasnet" ; eval $DOIT
CMD="autoheader" ; eval $DOIT
set -x
   # autoheader omits updating the header if it thinks nothing has changed, 
   # but automake's dependency checks are stronger (include aclocal.m4, which just changed)
   # ensure the header looks up-to-date (autoheader -f option not version portable)
   touch upcr_config.h.in
set +x
CMD="autoconf" ; eval $DOIT
set -x

# Perform some postprocessing to fix bugs in the configure script:
# 1) caching:
# Our configure script requires caching, and autoconf 2.5 stupidly disables
# caching by default. Caching may open some dangers of stale values, but
# the alternative is worse - automake reconfiguring in the absence of
# precious environment variables leads to silent incorrect behavior that
# can't be detected or fixed because there's no cache!
# Restore ./config.cache as the default cache
# 2) recursive configure:
# When $top_builddir contains a space, the configure script tries to cd
# back to $top_builddir w/o quoting it.
# Add quotes around the offending command.
mv configure .configure-orig
perl -pe 's@^cache_file=/dev/null$@cache_file=./config.cache@; s/cd \$ac_popdir/cd "\$ac_popdir"/;' \
    .configure-orig > configure
chmod +x configure
rm -f .configure-orig

set +x
# do NOT use automake -i: the meaning of that automake option recently changed 
CMD="automake -a" ; eval $DOIT
set -x

# Perform some postprocessing to fix bugs in automake:
# 1) Overrides: Automake is too stupid to notice several overrides we intentionally perform,
# leading to spam of harmless warnings of the form:
#   warning: overriding commands for target X
#   warning: ignoring old commands for target X
# Remove the earlier, overridden rule to silence the warning AND remove unwanted dependencies
# top-level: Makefile and distclean targets, remove all but the last rule (ours)
perl -0777 -i.bak -pe 's/^(distclean|Makefile):[^\n]*\n(?:\t[^\n]*\n)*(?=.*\n\1:)//msg' Makefile.in
rm -f Makefile.in.bak

rm -Rf autom4te*.cache