mainAutoconf - Support: sr #110476, ar: `u' modifier ignored since `D'...


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

Submitter:  R. Diez <rdiez>
Submitted:  Thu 22 Apr 2021 07:41:44 AM UTC
Category:  None Priority:  5 - Normal
Severity:  3 - Normal Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Operating System:  None
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Thu 22 Apr 2021 07:41:44 AM UTC, original submission:  

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

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.

R. Diez <rdiez>


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