bintuils ar.c multiple instances of ar on same library

[Navin P]

On Sat, Aug 10, 2024, 14:39 Alan Modra <amodra@gmail.com> wrote:

> On Sat, Aug 10, 2024 at 01:45:57PM +0530, Navin P wrote:
> > Hi,
> >    I ran multiple instances of ar during a parallel build and they
> > were updating different object files using ar rv sometimes the same
> > object file again.
> >
> > When i run make -j1 i find all the object files  libx.a but when i do
> > make -j8 i find some missing object files inside libx.a.
> >
> > Then i looked at ar.c and found that there is no synchronization
> > between 2 instances of ar on same library. Am i missing something?
> >
> > What tool can i use instead of ar for such scenarios?
>
> This is really a "make" question.  See
> https://www.gnu.org/software/make/manual/html_node/Archive-Pitfalls.html



Thanks Alan. I can't update the makefile in the coming days because it is
generated and lot of bash scripts are used. Hence was thinking of a
solution based on ar . I just saw a libtool answer on stackoverflow but not
sure if it suffers from the same problem.

Any more ideas are welcome.

I'll try asking in the gnu make list for ideas.

>
>
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