RE: serial vs parallel for ar

[PATTON, BILLY \(SBCSI\)]

I know one way to get around the problem, not very good, but!
During my chain of rules I have
all           : proj
proj          : proj+bb
proj+bb       : proj+bb+topic
proj+bb+topic : $(src+proj+bb+topic:.c=.o)
%.o : %.c
  compile $<
  create dependencies $<
  archive $@

At the "proj+bb :" target I could do the commands there for archiving in
a loop. By the time that command fires all .o's will have been created.
But why should I put them in there every time.  They only need to be put
in when something changes.  The most obvious place would be where/when I
compile.  But that puts me back to the problem of multiple processes
accessing the .a at the same time.  Not using -j is not an option.

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden On Behalf 
> Of PATTON, BILLY (SBCSI)
> Sent: Thursday, May 18, 2006 7:48 AM
> To: address@hidden
> Subject: serial vs parallel for ar
> 
> 
> I'm trying to add files to a .a file.  As long as I don't run 
> make with
> -j it runs ok. But when I run with the -j I get the following error
> messages:
> ar:
> /makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/li
> b/libinfgn
> .a not in archive format
> make: ***
> [/makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/g
> ipasswd.o]
> Error 1
> make: *** Waiting for unfinished jobs....
> ar:
> /makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/li
> b/libinfgn
> .a not in archive format
> make: ***
> [/makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/c
> ryptut.o]
> Error 1
> ar:
> /makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/li
> b/libinfgn
> .a not in archive format
> make: ***
> [/makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/giconv.o]
> Error 1
> ar:
> /makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/li
> b/libinfgn
> .a not in archive format
> make: ***
> [/makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/extfsh.o]
> Error 1
> ar:
> /makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/li
> b/libinfgn
> .a not in archive format
> make: ***
> [/makefile_test/dev/bp1497/test/v0608/PRODUCT_TREE/ldb/infgn/gifile.o]
> Error 1
> 
> It is probably the fact that several processes are trying to 
> access this
> .a at the same time.
> What can I do?
> 
> 
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