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Re: is __sync_bool_compare_and_swap a builtin function in gcc?

From: Marc Glisse <marc dot glisse+gcc at normalesup dot org>
To: Da Zheng <zhengda1936 at gmail dot com>
Cc: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
Date: Sun, 23 May 2010 15:46:54 +0200 (CEST)
Subject: Re: is __sync_bool_compare_and_swap a builtin function in gcc?
References: <4BF92E0E.3000403@gmail.com>
Reply-to: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>

On Sun, 23 May 2010, Da Zheng wrote:

da-zhengs-macbook:tmp dazheng$ gcc -o test test.c
Undefined symbols:
 "___sync_val_compare_and_swap_4", referenced from:
     _main in ccyxRK5Y.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

I use macbook and it has Intel Dual core. My GCC version is 4.4.1. Could anyone
tell me why __sync_val_compare_and_swap cannot be used. Thank you.

You probably need an appropriate -march flag (386, which the compiler may target by default, doesn't have the instructions).

Follow-Ups:
- Re: is __sync_bool_compare_and_swap a builtin function in gcc?
  - From: Da Zheng

References:
- is __sync_bool_compare_and_swap a builtin function in gcc?
  - From: Da Zheng

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