crtstuff.c (__dso_handle): Declare.

	* crtstuff.c (__dso_handle): Declare.
	(__cxa_finalize): Likewise.
	(do_global_dtors_aux): Call __cxa_finalize if __dso_handle is
	non-NULL.

	* invoke.texi: Document -fuse-cxa-atexit.

	* tree.h (ptr_type_node): Document.
	(const_ptr_type_node): Likewise.

From-SVN: r30989

gcc/ChangeLog

+1999-12-16  Mark Mitchell  <mark@codesourcery.com>
+
+	* crtstuff.c (__dso_handle): Declare.
+	(__cxa_finalize): Likewise.
+	(do_global_dtors_aux): Call __cxa_finalize if __dso_handle is
+	non-NULL.
+
+	* invoke.texi: Document -fuse-cxa-atexit.
+	
+	* tree.h (ptr_type_node): Document.
+	(const_ptr_type_node): Likewise.
+
 Fri Dec 17 01:32:38 MET 1999  Jan Hubicka  <hubicka@freesoft.cz>
 
 	* regmove.c (optimize_reg_copy_1): Ignore LOOP notes.

gcc/crtstuff.c

@@ -129,6 +129,19 @@ typedef void (*func_ptr) (void);
 
 #ifdef OBJECT_FORMAT_ELF
 
+/* Declare the __dso_handle variable.  It should have a unique value
+   in every shared-object; in a main program its value is zero.  */
+
+#ifdef CRTSTUFFS_O
+void *__dso_handle = &__dso_handle;
+#else
+void *__dso_handle = 0;
+#endif
+
+/* The __cxa_finalize function may not be available so we use only a
+   weak declaration.  */
+extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
+
 /* Run all the global destructors on exit from the program.  */
  
 /* Some systems place the number of pointers in the first word of the
@@ -159,6 +172,9 @@ __do_global_dtors_aux (void)
   if (completed)
     return;
 
+  if (__dso_handle && __cxa_finalize)
+    __cxa_finalize (__dso_handle);
+
   while (*p)
     {
       p++;

gcc/invoke.texi

@@ -109,7 +109,7 @@ in the following sections.
 -fhonor-std -fhuge-objects  -fno-implicit-templates  -finit-priority
 -fno-implement-inlines -fname-mangling-version-@var{n}  -fno-default-inline  
 -foperator-names  -fno-optional-diags  -fpermissive -frepo  -fstrict-prototype
--fsquangle  -ftemplate-depth-@var{n} -fvtable-thunks
+-fsquangle  -ftemplate-depth-@var{n} -fuse-cxa-atexit -fvtable-thunks
 -nostdinc++  -Wctor-dtor-privacy -Wno-deprecated -Weffc++  
 -Wno-non-template-friend 
 -Wnon-virtual-dtor  -Wold-style-cast  -Woverloaded-virtual  
@@ -1217,6 +1217,13 @@ A limit on the template instantiation depth is needed to detect
 endless recursions during template class instantiation. ANSI/ISO C++
 conforming programs must not rely on a maximum depth greater than 17.
 
+@item -fuse-cxa-atexit
+Register destructors for objects with static storage duration with the
+@code{__cxa_atexit} function rather than the @code{atexit} function.
+This option is required for fully standards-compliant handling of static
+destructors, but will only work if your C library supports
+@code{__cxa_atexit}.
+
 @item -fvtable-thunks
 Use @samp{thunks} to implement the virtual function dispatch table
 (@samp{vtable}).  The traditional (cfront-style) approach to

gcc/tree.h

@@ -1542,7 +1542,9 @@ extern tree global_trees[TI_MAX];
 #define complex_long_double_type_node	global_trees[TI_COMPLEX_LONG_DOUBLE_TYPE]
 
 #define void_type_node			global_trees[TI_VOID_TYPE]
+/* The C type `void *'.  */
 #define ptr_type_node			global_trees[TI_PTR_TYPE]
+/* The C type `const void *'.  */
 #define const_ptr_type_node		global_trees[TI_CONST_PTR_TYPE]
 #define ptrdiff_type_node		global_trees[TI_PTRDIFF_TYPE]
 #define va_list_type_node		global_trees[TI_VA_LIST_TYPE]