patch: make build.sh create deterministic C++ output

["Perry E. Metzger" <perry%piermont.com@localhost>]

The following patch turns on Joerg's BUILDSEED feature for all
build.sh builds. It sets BUILDSEED to NetBSD-majorversion (i.e. right
now, NetBSD-4, soon NetBSD-5, etc.), and provides a -S flag so that
the BUILDSEED may be set to a different value if people wish.

Are there objections to my committing it?

Perry

Index: build.sh
===================================================================
RCS file: /cvsroot/src/build.sh,v
retrieving revision 1.189
diff -u -r1.189 build.sh
--- build.sh    27 Jun 2008 21:38:36 -0000      1.189
+++ build.sh    4 Aug 2008 18:03:20 -0000
@@ -241,6 +241,10 @@
        #
        DISTRIBVER="$(${HOST_SH} ${TOP}/sys/conf/osrelease.sh)"
 
+       # Set the BUILDSEED to NetBSD-"N"
+       #
+       setmakeenv BUILDSEED "NetBSD-$(${HOST_SH} ${TOP}/sys/conf/osrelease.sh 
-m)"
+
        # Set various environment variables to known defaults,
        # to minimize (cross-)build problems observed "in the field".
        #
@@ -509,9 +513,10 @@
        fi
        cat <<_usage_
 
-Usage: ${progname} [-EnorUux] [-a arch] [-B buildid] [-C cdextras] [-D dest]
-               [-j njob] [-M obj] [-m mach] [-N noisy] [-O obj] [-R release]
-               [-T tools] [-V var=[value]] [-w wrapper] [-X x11src] [-Z var]
+Usage: ${progname} [-EnorUux] [-a arch] [-B buildid] [-C cdextras]
+               [-D dest] [-j njob] [-M obj] [-m mach] [-N noisy]
+               [-O obj] [-R release] [-S seed] [-T tools]
+               [-V var=[value]] [-w wrapper] [-X x11src] [-Z var]
                operation [...]
 
  Build operations (all imply "obj" and "tools"):
@@ -562,6 +567,7 @@
     -o          Set MKOBJDIRS=no; do not create objdirs at start of build.
     -R release  Set RELEASEDIR to release.  [Default: releasedir]
     -r          Remove contents of TOOLDIR and DESTDIR before building.
+    -S seed     Set BUILDSEED to seed.  [Default: NetBSD-majorversion]
     -T tools    Set TOOLDIR to tools.  If unset, and TOOLDIR is not set in
                 the environment, ${toolprefix}make will be (re)built 
unconditionally.
     -U          Set MKUNPRIVED=yes; build without requiring root privileges,
@@ -581,7 +587,7 @@
 
 parseoptions()
 {
-       opts='a:B:bC:D:dEhi:j:k:M:m:N:nO:oR:rT:tUuV:w:xX:Z:'
+       opts='a:B:bC:D:dEhi:j:k:M:m:N:nO:oR:rS:T:tUuV:w:xX:Z:'
        opt_a=no
 
        if type getopts >/dev/null 2>&1; then
@@ -707,6 +713,11 @@
                        do_rebuildmake=true
                        ;;
 
+               -S)
+                       eval ${optargcmd}
+                       setmakeenv BUILDSEED "${OPTARG}"
+                       ;;
+
                -T)
                        eval ${optargcmd}; resolvepath
                        TOOLDIR="${OPTARG}"