openwrt/toolchain/gcc/3.4.2/300-pr17976.patch

   1 From: Mark Mitchell <mark@codesourcery.com>
   2 Sender: gcc-patches-owner@gcc.gnu.org
   3 To: gcc-patches@gcc.gnu.org
   4 Subject: C++ PATCH: PR 17976
   5 Date: Thu, 14 Oct 2004 21:24:41 -0700
   6
   7
   8 This was a case where we generated multiple destructor calls for the
   9 same global variable, in the (probably rare) situation that an
  10 "extern" declaration followed the definition.
  11
  12 Tested on i686-pc-linux-gnu, applied on the mainline and on the 3.4
  13 branch.
  14
  15 --
  16 Mark Mitchell
  17 CodeSourcery, LLC
  18 mark@codesourcery.com
  19
  20 # DP: 2004-10-14  Mark Mitchell  <mark@codesourcery.com>
  21 # DP:
  22 # DP:   PR c++/17976
  23 # DP:   * decl.c (cp_finish_decl): Do not call expand_static_init more
  24 # DP:   than once for a single variable.
  25 # DP:
  26 # DP: 2004-10-14  Mark Mitchell  <mark@codesourcery.com>
  27 # DP:
  28 # DP:   PR c++/17976
  29 # DP:   * g++.dg/init/dtor3.C: New test.
  30
  31 Index: testsuite/g++.dg/init/dtor3.C
  32 ===================================================================
  33 RCS file: testsuite/g++.dg/init/dtor3.C
  34 diff -N testsuite/g++.dg/init/dtor3.C
  35 *** /dev/null   1 Jan 1970 00:00:00 -0000
  36 --- gcc/gcc/testsuite/g++.dg/init/dtor3.C       15 Oct 2004 04:02:22 -0000
  37 ***************
  38 *** 0 ****
  39 --- 1,21 ----
  40 + // PR c++/17976
  41 + // { dg-do run }
  42 +
  43 + extern "C" void abort();
  44 + struct A
  45 + {
  46 +   static int i;
  47 +   A(){}
  48 +   ~A(){i++;if(i>1)abort();}
  49 + };
  50 +
  51 + int A::i = 0;
  52 +
  53 + A a;
  54 + extern A a;
  55 +
  56 + int main()
  57 + {
  58 +   return 0;
  59 + }
  60 +
  61 ===================================================================
  62 RCS file: /cvs/gcc/gcc/gcc/cp/decl.c,v
  63 retrieving revision 1.1174.2.26
  64 retrieving revision 1.1174.2.27
  65 diff -u -r1.1174.2.26 -r1.1174.2.27
  66 --- gcc/gcc/cp/decl.c   2004/10/10 21:54:59     1.1174.2.26
  67 +++ gcc/gcc/cp/decl.c   2004/10/15 04:23:46     1.1174.2.27
  68 @@ -4778,6 +4778,7 @@
  69    tree cleanup;
  70    const char *asmspec = NULL;
  71    int was_readonly = 0;
  72 +  bool var_definition_p = false;
  73
  74    if (decl == error_mark_node)
  75      return;
  76 @@ -4930,6 +4931,11 @@
  77           /* Remember that the initialization for this variable has
  78              taken place.  */
  79           DECL_INITIALIZED_P (decl) = 1;
  80 +         /* This declaration is the definition of this variable,
  81 +            unless we are initializing a static data member within
  82 +            the class specifier.  */
  83 +         if (!DECL_EXTERNAL (decl))
  84 +           var_definition_p = true;
  85         }
  86        /* If the variable has an array type, lay out the type, even if
  87          there is no initializer.  It is valid to index through the
  88 @@ -5004,8 +5010,16 @@
  89                 initialize_local_var (decl, init);
  90             }
  91
  92 -         if (TREE_STATIC (decl))
  93 -           expand_static_init (decl, init);
  94 +         /* If a variable is defined, and then a subsequent
  95 +            definintion with external linkage is encountered, we will
  96 +            get here twice for the same variable.  We want to avoid
  97 +            calling expand_static_init more than once.  For variables
  98 +            that are not static data members, we can call
  99 +            expand_static_init only when we actually process the
 100 +            initializer.  It is not legal to redeclare a static data
 101 +            member, so this issue does not arise in that case.  */
 102 +         if (var_definition_p && TREE_STATIC (decl))
 103 +           expand_static_init (decl, init);
 104         }
 105      finish_end0:
 106