#!/bin/sh

# Script to compile a resource file for a DLL if there is a .rc file

# for it. The resource source file is supposed to contain a version

# info section, that uses the string BUILDNUMBER as the least

# significant part of the version numbers. This script replaces that

# string with a "build number" before compiling the binary resource

# file. The build number is kept between builds in a "stamp" file, and

# incremented each time. (If there is no stamp file, build number 0 is

# used.) The intention is that only the "official" maintainer of a DLL

# keeps such a stamp file, and thus the DLLs he releases have

# increasing version number resources, which can be used by an

# installer program to decide whether to replace an existing DLL with

# the same name.

# This is just my (tml@iki.fi) idea, if somebody comes up with a

# better way to generate version number resources, don't hesitate to

# suggest.

# The command line arguments are:

# $1: the name of the .rc file to check

# $2: the name of the resource object file to produce, if the rc file exists

# Check if we have a resource file for this DLL.

rcfile=$1

resfile=$2

if [ -f $rcfile ]; then

    # Check if we have a build number stamp file.

    basename=`basename $rcfile .rc`

    if [ -f $basename-build.stamp ]; then

	read number <$basename-build.stamp

	buildnumber=$[number]

	echo Build number $buildnumber

	rm -rf $basename-build.stamp

    else

	echo Using zero as build number

        buildnumber=0

    fi

    m4 -DBUILDNUMBER=$buildnumber <$rcfile >$$.rc &&

	${WINDRES-windres} $$.rc $resfile &&

	rm $$.rc

else

    # Return failure

    exit 1

fi