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Re: Re: [patch libstdc++] Optimize synchronization in std::future if futexes are available.

From: Sandra Loosemore <sandra at codesourcery dot com>
To: Jonathan Wakely <jwakely at redhat dot com>
Cc: Hans-Peter Nilsson <hp at bitrange dot com>, <pinskia at gmail dot com>, David Edelsohn <dje dot gcc at gmail dot com>, Torvald Riegel <triegel at redhat dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>
Date: Sat, 17 Jan 2015 12:59:52 -0700
Subject: Re: Re: [patch libstdc++] Optimize synchronization in std::future if futexes are available.
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References: <CAGWvnyng32Rh7US3Azhao9B=JMnsZaJ_1vRik36wQ4FKWm1BkQ at mail dot gmail dot com> <9CAB68C4-08D2-43A1-9A8B-EDE135DDFC8F at gmail dot com> <alpine dot BSF dot 2 dot 02 dot 1501170144070 dot 76242 at arjuna dot pair dot com> <20150117134853 dot GR3360 at redhat dot com>

Re:

On 17/01/15 01:45 -0500, Hans-Peter Nilsson wrote:

On Fri, 16 Jan 2015, pinskia@gmail.com wrote:

> On Jan 16, 2015, at 9:57 PM, David Edelsohn <dje.gcc@gmail.com> wrote:
>
> This patch has broken bootstrap on AIX
>
> May I mention that this really should have been tested on systems
> other than x86 Linux.

It also broke all newlib targets too. So you could have tested one listed in the sim-test web page.


For those interested, PR64638.


Should be fixed in trunk now, by this patch.


I'm now getting this error in an arm-none-linux-gnueabi cross build:

In file included from/scratch/sandra/arm-fsf2/obj/gcc-mainline-0-arm-none-linux-gnueabi-i686-pc-linux-gnu/arm-none-linux-gnueabi/libstdc++-v3/include/future:44:0,from/scratch/sandra/arm-fsf2/src/gcc-mainline/libstdc++-v3/src/c++11/functexcept.cc:34:/scratch/sandra/arm-fsf2/obj/gcc-mainline-0-arm-none-linux-gnueabi-i686-pc-linux-gnu/arm-none-linux-gnueabi/libstdc++-v3/include/bits/atomic_futex.h:71:3:error: #error We require lock-free atomic operations on int

 # error We require lock-free atomic operations on int
   ^

It used to work a few days ago.... nothing changed in my buildenvironment except that I did "svn up" in my gcc source directory....


-Sandra

Follow-Ups:
- Re: Re: [patch libstdc++] Optimize synchronization in std::future if futexes are available.
  - From: Jonathan Wakely

References:
- Re: [patch libstdc++] Optimize synchronization in std::future if futexes are available.
  - From: David Edelsohn
- Re: [patch libstdc++] Optimize synchronization in std::future if futexes are available.
  - From: pinskia
- Re: [patch libstdc++] Optimize synchronization in std::future if futexes are available.
  - From: Hans-Peter Nilsson
- Re: [patch libstdc++] Optimize synchronization in std::future if futexes are available.
  - From: Jonathan Wakely

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