[sr #110476] ar: `u' modifier ignored since `D' is the default (see `U')

[R. Diez]

URL:
  <https://savannah.gnu.org/support/?110476>

                 Summary: ar: `u' modifier ignored since `D' is the default
(see `U')
                 Project: Autoconf
            Submitted by: rdiez
            Submitted on: Thu 22 Apr 2021 07:41:44 AM UTC
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None

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Details:

I recently added a very simple library called libAtmelSoftwareFramework.a to
this cross-compilation project of mine:

https://github.com/rdiez/JtagDue/blob/master/Project/Makefile.am

So I immediately got this warning:

ar: `u' modifier ignored since `D' is the default (see `U')

This has been a known issue for years. There are many discussions on the
Internet. As a new Autoconf user, you have to search for the error message and
read here and there. Some people present their opinions about possible ways to
fix this problem, with possible caveats.

I came up with this workaround for my project:

# By default, Automake is using $(AR) $(ARFLAGS), and ARFLAGS defaults to
"cru".
  libAtmelSoftwareFramework_a_AR := $(AR) cr

I think it is time for Autoconf to do something about this, instead of letting
everybody waste time all over the place.

At the very least, this shortcoming should be documented in the Autoconf
manual. Failing that, the FAQ page should mention it.

The best thing to do is to modify Autoconf somehow in order to prevent this
warning.




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