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Re: [build] Move gthr to toplevel libgcc

From: John David Anglin <dave dot anglin at nrc-cnrc dot gc dot ca>
To: Rainer Orth <ro at CeBiTec dot Uni-Bielefeld dot DE>
Cc: <gcc-patches at gcc dot gnu dot org>, Paolo Bonzini <bonzini at gnu dot org>, "Joseph S. Myers" <joseph at codesourcery dot com>, Ian Lance Taylor <iant at google dot com>, Nathan Sidwell <nathan at codesourcery dot com>, Joel Sherrill <joel at oarcorp dot com>, Kai Tietz <ktietz at redhat dot com>, Richard Sandiford <rdsandiford at googlemail dot com>, David Edelsohn <dje dot gcc at gmail dot com>, Ulrich Weigand <uweigand at de dot ibm dot com>, Nicola Pero <nicola dot pero at meta-innovation dot com>, <fortran at gcc dot gnu dot org>, <libstdc++ at gcc dot gnu dot org>
Date: Mon, 8 Aug 2011 13:04:03 -0400
Subject: Re: [build] Move gthr to toplevel libgcc
References: <yddr54wrp4q.fsf@manam.CeBiTec.Uni-Bielefeld.DE> <BLU0-SMTP97C5A5D7528A0366AFD69497210@phx.gbl> <yddwrenrhn3.fsf@manam.CeBiTec.Uni-Bielefeld.DE>

On 8-Aug-11, at 12:29 PM, Rainer Orth wrote:

John David Anglin <dave.anglin@nrc-cnrc.gc.ca> writes:
I haven't moved two macros used in gthr*.h yet: GTHREAD_USE_WEAK and SUPPORTS_WEAK. This seems to warrant a separate followup patch, but for the record I report my findings:

* GTHREAD_USE_WEAK must be defined explicitly. It needs to be poisoned in system.h after the move. Right now, only a few targets defined a non-default value:
darwin.h		#define GTHREAD_USE_WEAK 0
i386/cygwin.h		#define GTHREAD_USE_WEAK 0
ia64/hpux.h		#define GTHREAD_USE_WEAK 0
pa/pa64-hpux.h	#define GTHREAD_USE_WEAK 0
pa/som.h		#define GTHREAD_USE_WEAK 0
The last 3 could be handled in a new hpux-lib.h, but perhaps this
isn't necessary if ax_sys_weak_alias.m4 works.
I'm not sure this is possible in general on HP-UX.
Do you suggest that support for weak definitions (undefined weak) cannot be detected by a configure test on HP-UX?

Undefined weak support can be detected with a simple link test.

The situation with aliases is more complex.

Dave

References:
- [build] Move gthr to toplevel libgcc
  - From: Rainer Orth
- Re: [build] Move gthr to toplevel libgcc
  - From: John David Anglin
- Re: [build] Move gthr to toplevel libgcc
  - From: Rainer Orth

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