re: lib/45126: highly parallel build broken in krb5/heimdal

[matthew green <mrg%eterna.com.au@localhost>]

The following reply was made to PR lib/45126; it has been noted by GNATS.

From: matthew green <mrg%eterna.com.au@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: lib-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost
Subject: re: lib/45126: highly parallel build broken in krb5/heimdal
Date: Thu, 21 Jul 2011 15:49:20 +1000

 i think i may have figured out the cause of this.  i noticed that
 my build tree had hdb_asn1.h as a zero length file.  after a little
 bit of red-herring with seeing a similar zero length file in the
 src/compat build, i come across the rules in
 src/crypto/external/bsd/heimdal/Makefile.rules.inc:
 
 ${ASN1_FILES.${src}} ${src:.asn1=_asn1.hx} ${src:.asn1=_asn1-priv.hx}: ${src} \
                                         ${src:.asn1=.opt} ${TOOL_ASN1_COMPILE}
         ${TOOL_ASN1_COMPILE}                    \
                 ${ASN1_OPTS.${src}}             \
                 --option-file=${.ALLSRC:[2]}    \
                 ${.ALLSRC:[1]} ${src:.asn1=_asn1}
 
 
 this rule will run the asn1_compile multiple times when it infact
 only wants to be run once.  i'm not sure how this is causing zero
 length files to be created but this rule is, AFAIK, broken.
 
 i don't have a fix.
 
 
 .mrg.