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once.h でmultiple definition (2009-04-27 00:34 by akira #43446)

複数の.cppファイルでthread.hをincludeしているとmultiple definition の
リンクエラーになります。
/tmp/ccIiR5ho.o:(.data+0x0): multiple definition of `clx::detail::once_global_epoch'
/tmp/ccHB39Ej.o:(.data+0x0): first defined here
：
：
スマートな解決方法は無いでしょうか？
とりあえず#ifdefで初期化は特定のファイルだけにして他はexternにしましたが
まちがっているような気もするので正しいのかもお教えください。

#ifdef MAINFILE
　　once_flag once_global_epoch = ULONG_MAX;
：　　　　　　　
#else
extern once_flag once_global_epoch;
:
#endif
(Ticket #16444 is created from this message)

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RE: once.h でmultiple definition (2009-04-28 18:32 by cielquis #43516)

報告ありがとうございます．
取りあえずの対処法としては，上記で良いと思います．

修正法に関しては，現在検討中です．
修正版がリリースでき次第またこのスレッドに報告いたします．
それまでは，不便をおかけしますが上記の方法で対処をお願いいたします．
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RE: once.h でmultiple definition (2009-06-01 16:01 by cielquis #44127)

version 0.15.0 にて対応しました．
何か不都合がありましたら，またよろしくお願いいたします．
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RE: once.h でmultiple definition (2009-06-03 11:42 by akira #44160)

改修ありがとうございます。

ですが、
clx/unix/once.h:59: error: expected primary-expression before ‘{’ token
clx/unix/once.h:60: error: expected primary-expression before ‘{’ token
のエラーが出ます。
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RE: once.h でmultiple definition (2009-06-03 12:05 by cielquis #44162)

報告ありがとうございます & ご不便おかけしています．
上記ですが，どの環境だとエラーが出るのかが分からないので，
申し訳ありませんが，コンパイル環境（OS とコンパイラのバージョン）
を教えて頂けないでしょうか．
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RE: once.h でmultiple definition (2009-06-03 15:37 by akira #44172)

OSはLinux
ubuntu server v9.04

$ g++ example_thread.cpp
In file included from clx/thread.h:54,
from example_thread.cpp:36:
clx/unix/once.h: In constructor ‘clx::detail::global_condition::global_condition()’:
clx/unix/once.h:59: error: expected primary-expression before ‘{’ token
clx/unix/once.h:60: error: expected primary-expression before ‘{’ token

$ uname -a
Linux dev 2.6.28-11-server #42-Ubuntu SMP Fri Apr 17 02:48:10 UTC 2009 i686 GNU/Linux

$ gcc --version
gcc (Ubuntu 4.3.3-5ubuntu4) 4.3.3
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$
です。
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RE: once.h でmultiple definition (2009-06-03 13:16 by cielquis #44169)

予想される範囲で，unix/once.h を修正してみました．
最新のソースコード (unix/once.h) は下記から取得できます．
http://svn.sourceforge.jp/view/trunk/unix/?root=clxcpp
よろしければ，試した結果を知らせて頂けると幸いです．
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RE: once.h でmultiple definition (2009-06-03 15:50 by akira #44173)

お世話になっています。

http://svn.sourceforge.jp/view/trunk/unix/?root=clxcpp
このonce.hに入れ替えるとコンパイルエラーは起こらなくなりました
$ g++ example_thread.cpp -lpthread
$ ./a.out
AAAAA
AAAAAA
AAAAAAA
AAAAAAAA
AAAAAAAAA
AAAAAAAAAA
AAAAAAAAAAA
AAAAAAAAAAAA
AAAAAAAAAAAAA
AAAAAAAAAAAAAA
BBBBB
BBBBBB
BBBBBBB
BBBBBBBB
BBBBBBBBB
BBBBBBBBBB
BBBBBBBBBBB
BBBBBBBBBBBB
BBBBBBBBBBBBB
BBBBBBBBBBBBBB

end of main thread
$
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