#!/bin/sh

#  Multi-build script for testing compilation of all maintained configs of GDB.
#  Copyright (C) 2002  Free Software Foundation, Inc.
#  Contributed by Richard Earnshaw  (rearnsha@arm.com)

#  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 of the License, 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, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

usage() {
    cat <<EOF
Usage: gdb_mbuild.sh [ <options> ... ] <srcdir> <builddir>
 Options:
  -j <maxjobs>  Run <maxjobs> in parallel.  On a single cpu machine,
                2 is recommended.
  -k            Keep going.  Do not stop after the first build fails.
  -e <regexp>   Regular expression for selecting the targets to build.
  -f            Force rebuild.  Even rebuild previously built directories.
 Environment variables examined (with default if not defined):
  MAKE (make)"
 Note: Everything in <builddir>/gdb-allcross will be blown away.
EOF
    exit 1;
}

### COMMAND LINE OPTIONS

maxjobs=1
keepgoing=false
force=false
targexp=""
while test $# -gt 0
do
    case "$1" in
    -j )
	# Number of parallel make jobs (you probably want about 2 jobs
	# per cpu for maximum throughput)
	shift
	test $# -ge 1 || usage
	maxjobs=$1
	;;
    -k )
	# Should we soldier on after the first build fails?
	keepgoing=true
	;;
    -e )
	# A regular expression for selecting targets
	shift
	test $# -ge 1 || usage
	targexp="${targexp} -e ${1}"
	;;
    -f )
	# Force a rebuild
	force=true ; shift ;;
    -* ) usage ;;
    *) break ;;
    esac
    shift
done


### COMMAND LINE PARAMETERS

if test $# -ne 2
then
    usage
fi

# Convert these to absolute directory paths.

# Where the sources live
srcdir=`cd $1 && /bin/pwd` || exit 1

# Where the builds occur
builddir=`cd $2 && /bin/pwd` || exit 1


### ENVIRONMENT PARAMETERS

# Version of make to use
make=${MAKE:-make}
MAKE=${make}
export MAKE


# Where to look for the list of targets to test
maintainers=${srcdir}/gdb/MAINTAINERS
if [ ! -r ${maintainers} ]
then
    echo Maintainers file ${maintainers} not found
    exit 1
fi

# Get the list of targets and the build options
alltarg=`cat ${maintainers} | tr -s '[\t]' '[ ]' | sed -n '
/^[ ]*[-a-z0-9\.]*[ ]*[(]*--target=.*/ !d
s/^.*--target=//
s/).*$//
h
:loop
  g
  /^[^ ]*,/ !b end
  s/,[^ ]*//
  p
  g
  s/^[^,]*,//
  h
b loop
:end
p
' | if test "${targexp}" = ""
then
    grep -v -e broken -e OBSOLETE
else
    grep ${targexp}
fi`


# Run several jobs in parallel.
set --


# Usage: fail <message> <test-that-should-succeed>.  Should the build
# fail?  If the test is true, and we don't want to keep going, print
# the message and shoot everything in sight and abort the build.

fail ()
{
    msg="$1" ; shift
    if test "$@"
    then
	echo "${target}: ${msg}"
	if ${keepgoing}
	then
	    exit 0
	else
	    kill $$
	    exit 1
	fi
    fi
}


# Warn the user of what is comming, print the list of targets
echo "$alltarg"
echo ""


# For each target, configure and build it.
echo "$alltarg" | while true
do

    # Keep forking jobs until we've exceed our job capacity

    while test $# -lt ${maxjobs} && read target gdbopts simopts
    do

	(
	    trap "exit 1"  1 2 15
	    dir=${builddir}/${target}

	    # Should a scratch rebuild be forced?
	    if ${force}
	    then
		rm -rf ${dir}
	    fi
	    
	    # Don't bother re-building a built target (indicated by
	    # ${dir} being a file).
	    if test -f ${dir}
	    then
		#echo "${target}: already built"
		exit 0
	    fi

	    echo ${target} ${gdbopts} ${simopts} ...

	    # The config options
	    __target="--target=${target}"
	    __enable_gdb_warnings=`test -z "${gdbopts}" \
		|| echo "--enable-gdb-warnings=${gdbopts}"`
	    __enable_sim_warnings=`test -z "${simopts}" \
		|| echo "--enable-sim-warnings=${simopts}"`

	    # Did the previous configure attempt fail?  If it did
	    # restart from scratch.
	    if test ! -r ${dir}/gdb/Makefile
	    then
		rm -rf ${dir}
		mkdir -p ${dir}
	    fi

	    # From now on, we're in this target's build directory
	    cd ${dir} || exit 1

	    # Configure, if not already.
	    if test ! -r gdb/Makefile
	    then
		echo "... configuring ${target}"
		trap 'echo Removing partially configured ${target} directory ...; rm -rf ${dir}; exit 1' 1 2 15
		${srcdir}/configure \
		    ${__target} \
		    ${__enable_gdb_warnings} \
		    ${__enable_sim_warnings} \
		> Config.log 2>&1
		trap "exit 1"  1 2 15
	    fi
	    fail "configure failed" ! -r gdb/Makefile

	    # Build, if not built.
	    if test ! -x gdb/gdb -a ! -x gdb/gdb.exe
	    then
		echo "... compiling ${target}"
		${make} all-gdb > Build.log 2>&1
	    fi
	    fail "compile failed" ! -x gdb/gdb -a ! -x gdb/gdb.exe
	
	    # Check that the built GDB can at least print it's architecture.
	    echo "... running ${target}"
	    rm -f core gdb.core ${dir}/gdb/x
	    cat <<EOF > x
maint print architecture
quit
EOF
	    ./gdb/gdb -batch -nx -x x > Arch.log 2>&1 < /dev/null
	    fail "gdb dumped core" -r core -o -r gdb.core
	    fail "gdb printed no output" ! -s Arch.log
	    grep -e internal-error Arch.log && fail "gdb panic" 1

	    # Replace the build directory with a file as semaphore
	    # that stops a rebuild. (should the logs be saved?)
	    cd ${builddir}
	    rm -f ${target}.tmp
	    mv ${target}/Arch.log ${target}.tmp
	    rm -rf ${target}
	    mv ${target}.tmp ${target}

	    # Success!
	    echo "... ${target} built"

	) &

	# Append this to the list of things to wait for.  Grr, there
	# is a race condition as the cntrl-c could come in before the
	# trap is updated.
	trap "echo Killing jobs $@ $!; kill $@ $!; wait ; exit 1" 1 2 15
	set -- "$@" $!

    done

    # If we've got zero jobs, we're finished
    if test $# -eq 0
    then
	break
    fi

    # Reap the first running process, then starting again
    wait $1 ; shift

done

exit 0