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ar: `u' modifier ignored during linking


From: Rik
Subject: ar: `u' modifier ignored during linking
Date: Fri, 14 Apr 2017 14:11:09 -0700

4/14/17

I'm getting these annoying message every time a link is done during the
build process.

  CXXLD    liboctave/cruft/libcruft.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    liboctave/numeric/libnumeric.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    liboctave/operators/liboperators.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    liboctave/system/libsystem.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    liboctave/util/libutil.la
  CCLD     liboctave/wrappers/libwrappers.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    libgui/qterminal/libqterminal.la
  CXXLD    libgui/src/libgui-src.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    libgui/graphics/libgui-graphics.la
ar: `u' modifier ignored since `D' is the default (see `U')
  DVIPS    doc/liboctave/liboctave.ps
  CXXLD    libinterp/corefcn/libcorefcn.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    src/mkoctfile
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    src/octave
ar: `u' modifier ignored since `D' is the default (see `U')
  TEXI2PDF doc/liboctave/liboctave.pdf
ar: `u' modifier ignored since `D' is the default (see `U')
  CXXLD    src/octave-config
ar: `u' modifier ignored since `D' is the default (see `U')

This is on Mint 18.1 (Ubuntu 16.04-derived distribution).  Are other people
getting these warnings?  Are you just ignoring them?

I'd like to shut these warnings up because they are so numerous it could
hide a real problem with the build process.

This seems to be a known issue with Automake.  See
https://bugzilla.redhat.com/show_bug.cgi?id=1155273.

If I do

setenv AR_FLAGS cr

before running configure I can get rid of the warning.  Should we be doing
something permanent in configure.ac to set AR_FLAGS?

--Rik




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