From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nathan Myers <ncm@cygnus.com>
To: egcs@cygnus.com
Subject: Re: GCC
Date: Fri, 15 May 1998 15:17:00 -0000
Message-id: <355CBF56.687A3B53@cygnus.com>
References: <199805122117.XAA01539@ocean.campus.luth.se> <199805150243.TAA10200.cygnus.egcs@rtl.cygnus.com>
X-SW-Source: 1998-05/msg00548.html

Jim Wilson wrote:
> 
>         I have read duscussions on the FreeBSD lists that EGCS have to be compiled
>         differently to handle threaded and non-threaded compilation, IIRC.
>         gcc does "gcc" or "gcc -pthread". 
> 
>
> There is no problem here.  EGCS does exactly what you want.

Almost.

In C++ code, local variable static initializers do not yet have support for
locking during the initialization.  For example, in 

  void f()
  {
    static T t();
  }

The compiler generates something vaguely like

  void f__v()  // mangled
  {
    static T t;  // no ctor call here
    static bool __t__f_v_inited;
    if (!__t__f_v_inited) {
      T::__ct(&t);  // constructor call
      __t__f_v_inited = true;
    }
  }

For a multi-threaded program, this would need a lock or some other
accommodation.  But gcc-2.8 doesn't have this either.

Nathan Myers
ncm@cantrip.org