RE: serial vs parallel for ar

[PATTON, BILLY \(SBCSI\)]

Problem solved with external script.  It may have problems later but for
now it works just fine.

At least for a first pass it is working ok.

Her it is if anyone else wants it :
#!/usr/local/bin/perl
use strict;
use warnings;
use Carp;
########################################################################
# Purpose  : To allow multiple processes to write to a .a file at
#            the same time.  This is done using flock and opening the
#            file in append mode and attempting to lock it.
# Author   : Billy N. Patton
# Original : 18MAY2006
# Input    : archive path (.a) and file to be archived (.o)
# Notes    :
# Changes  :
#######################################################################

my $arch  = $ARGV[0];
my $doto  = $ARGV[1];
my $usage = "Usage : $0 /path/file.a /path/file.o\n";
my $LOCK_SH = 1; # shared lock
my $LOCK_EX = 2; # exclusive lock
my $LOCK_NB = 4; #
my $LOCK_UN = 8; # unlock
croak $usage unless defined $arch;
croak $usage unless defined $doto;

`ar cr $arch` unless -f $arch;

open OUT , ">>$arch";

flock OUT , $LOCK_EX;

`/usr/bin/ar rvu $arch $doto`;

flock OUT , $LOCK_UN;

close OUT;

> -----Original Message-----
> From: Paul Smith [mailto:address@hidden On Behalf Of Paul D. Smith
> Sent: Thursday, May 18, 2006 10:12 AM
> To: PATTON, BILLY (SBCSI)
> Cc: address@hidden
> Subject: RE: serial vs parallel for ar
> 
> 
> %% "PATTON, BILLY \(SBCSI\)" <address@hidden> writes:
> 
>   pb> Here is the skeleton of what I'm doing
>   pb> # create a .a file  empty
>   pb> AR_CREATE = if [ ! -f 
> $(PRD_TREE)/$(1)/$(2)/lib/lib$(2).a ] ; then \
>   pb>                 $(AR) $(AR_CREATE_OPT)
>   pb> $(PRD_TREE)/$(1)/$(2)/lib/lib$(2).a ; \
>   pb>                 $$(CHMOD) 
> $(PRD_TREE)/$(1)/$(2)/lib/lib$(2).a ; \
>   pb>             fi
> 
>   pb> # add a file to a archive
>   pb> AR_ADD = $(NM) $@ | grep "main.*extern|entry.*CODE" > 
> /dev/null ; \
>   pb>         if [ $$? -ne 0 ] ; then $(AR) $(AR_OPT) $(LIB) 
> $@ > /dev/null ;
>   pb> fi
> 
>   pb> # short hand to create dependencies
>   pb> MKDEP = $(MAKEDEPEND) -proj $(1) -bb $(2) -ifile $$< $$(INCLUDE)
> 
>   pb> # compile .c files to .o
>   pb> COMP_CC = @$$(CC) $$(CCFLAGS) $$(INCLUDE) -o $$@ -c $$< ; \
>   pb>         $(MKDEP) ; $(AR_CREATE); $$(AR_ADD)
> 
> I don't understand why you want to put .o's into the archive one at a
> time.  Why not do it the same way the linker does, and have only one
> invocation of "ar"?  That is the easy way to make sure you don't have
> conflicts even with -j, and it will even be more efficient since you
> have only one invocation of ar instead of one per .o.
> 
> -- 
> --------------------------------------------------------------
> -----------------
>  Paul D. Smith <address@hidden>          Find some GNU make tips at:
>  http://www.gnu.org                      http://make.paulandlesley.org
>  "Please remain calm...I may be mad, but I am a 
> professional." --Mad Scientist
>