#!/bin/sh

#
# dependgen -root rootdir -Ioptions src ...
#
# Script to generate dependencies.  This runs makedepend, adding the following:
#  o Place objects in objs/${ARCH}/${OPT}/ (with make variable refs)
#  o Removes absolute file dependences and those under $ROOT/tools
#  o Discards warnings
#  o Output file is .depend
#  o adds dependencies for .cc source files
# 

flags=''
root=''
while [ $# -gt 0 ] ; do
    case $1 in
        -root)
            shift
            root="$1"
            shift;;
        --)
            shift
            break;;
        -*)
            flags="${flags} $1"
            shift;;
        *)
            break;;
    esac
done
srcs="$*"

if [ "x$root" = "x" ] ; then
    echo "Error: must specify -root" >&2
    exit 1
fi

tmp1dep=depend1.tmp
tmp2dep=depend2.tmp
tmpout=depend.out.tmp

rmtmp="rm -f $tmp1dep $tmp1dep.bak $tmp2dep $tmpout"

# make sure there are no stale tmp files
$rmtmp

# Generate dependencies on .h file.
# Use a small width (-w) to ensure there is only one dependency per line.
# Don't output stderr unless command fails.
touch $tmp1dep
makedepend $flags -p'objs/${ARCH}/${OPT}/' -w5 -f$tmp1dep -- $srcs >$tmpout 2>&1
if [ $? != 0 ] ; then
    cat $tmpout
    $rmtmp
    exit 1
fi

# Remove absolute file names and those under to $root/tools
awk -v "root=$root" '
BEGIN {
    toolsDir=root "/tools"
    toolsLen=length(toolsDir)
}
((match($2, "^/") == 0) && (substr($2, 1, toolsLen) != toolsDir)) {
    # not absolute or under tools
    print $0
}' $tmp1dep >$tmp2dep

# Append .o: .cc dependencies.
echo $srcs | awk '
BEGIN {
     # break into records on whitespace to process files separately
     RS="[ \n\t]+"
}
/\w+/{
    # generate name of .o from .c or .cc
    # CHANGED 22 June 2005 Kevin Karplus
    #	to require \w+ match and eliminate erroneous empty test
    obj=$0;
    sub("[.][^.]+$", ".o", obj); 
    print "objs/${ARCH}/${OPT}/" obj ": " $0
}' >>$tmp2dep

mv -f $tmp2dep .depend

$rmtmp