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Message-ID: <48781a6605051114452b5cba07@mail.gmail.com>
Date: Wed, 11 May 2005 17:45:50 -0400
From: "William M. (Mike) Miller" <william DOT m DOT miller AT gmail DOT com>
Reply-To: "William M. (Mike) Miller" <william DOT m DOT miller AT gmail DOT com>
To: cygwin AT cygwin DOT com
Subject: C++ static destructors run in wrong order
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I mentioned this at the tail end of the thread on static destructors
not running, but since I got no reaction I guess it was probably
overlooked there.

As noted by Christopher Faylor, the May 10 snapshot fixes the
problem of destructors for static objects not being run when
main() returns.  However, it does not fix a problem that was also
introduced in 1.5.16, namely, that destructors for static objects
run in the wrong order.  The C++ Standard says that such
destructors run in the inverse order of their constructors, and
that was the case prior to 1.;5.16.  However, as demonstrated
by the following sample program, global static objects are now
destroyed before local static objects, ignoring their order of
construction:

    #include <stdio.h>
    #include <stdlib.h>
    struct A {
      int i;
      A(int p) : i(p) { printf("A::A(%d)\n", i); }
      ~A() { printf("A::~A for %d\n", i); }
    };
    A a(1);
    void f() {
      static A a(3);
    }
    main () {
      static A a(2);
      printf("main\n");
      f();
      exit(0);
    }

This now prints

    A::A(1)
    A::A(2)
    main
    A::A(3)
    A::~A for 1
    A::~A for 3
    A::~A for 2

"A::~A for 1" should be last.

-- 
William M. (Mike) Miller | Edison Design Group
william DOT m DOT miller AT gmail DOT com

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