configure.in: Add --enable-__cxa_atexit.

2002-06-07  H.J. Lu  (hjl@gnu.org)

	* configure.in: Add --enable-__cxa_atexit.
	* configure: Regenerated.
	* config.in: Likewise.

	* defaults.h (DEFAULT_USE_CXA_ATEXIT): New. Defined to be 0 if
	not defined.

2002-06-07  H.J. Lu  (hjl@gnu.org)

	* decl2.c (flag_use_cxa_atexit): Set to DEFAULT_USE_CXA_ATEXIT.

From-SVN: r54345

gcc/ChangeLog

+2002-06-07  H.J. Lu  (hjl@gnu.org)
+
+	* configure.in: Add --enable-__cxa_atexit.
+	* configure: Regenerated.
+	* config.in: Likewise.
+
+	* defaults.h (DEFAULT_USE_CXA_ATEXIT): New. Defined to be 0 if
+	not defined.
+
 2002-06-07  Gabriel Dos Reis  <gdr@merlin.nerim.net>
 
 	* diagnostic.c (diagnostic_build_prefix): Fix initialization.

gcc/config.in

@@ -307,6 +307,12 @@
    every opportunity.  This is extremely expensive. */
 #undef ENABLE_GC_ALWAYS_COLLECT
 
+/* Define if you want to use __cxa_atexit, rather than atexit, to
+   register C++ destructors for local statics and global objects.
+   This is essential for fully standards-compliant handling of
+   destructors, but requires __cxa_atexit in libc. */
+#undef DEFAULT_USE_CXA_ATEXIT
+
 /* Define if you want the C and C++ compilers to support multibyte
    character sets for source code. */
 #undef MULTIBYTE_CHARS

gcc/configure.in

@@ -264,6 +264,18 @@ elif test x$withval != xno; then
   cpp_install_dir=$withval
 fi])
 
+# Enable __cxa_atexit for C++.
+AC_ARG_ENABLE(__cxa_atexit,
+[  --enable-__cxa_atexit   enable __cxa_atexit for C++],
+[], [])
+if test x$enable___cxa_atexit = xyes; then
+  AC_DEFINE(DEFAULT_USE_CXA_ATEXIT, 1,
+  [Define if you want to use __cxa_atexit, rather than atexit, to
+   register C++ destructors for local statics and global objects.
+   This is essential for fully standards-compliant handling of
+   destructors, but requires __cxa_atexit in libc.])
+fi
+  
 # Enable Multibyte Characters for C/C++
 AC_ARG_ENABLE(c-mbchar,
 [  --enable-c-mbchar       enable multibyte characters for C and C++],

gcc/cp/ChangeLog

+2002-06-07  H.J. Lu  (hjl@gnu.org)
+
+	* decl2.c (flag_use_cxa_atexit): Set to DEFAULT_USE_CXA_ATEXIT.
+
 2002-06-06  Gabriel Dos Reis  <gdr@codesourcery.com>
 
 	* error.c (cp_error_at): Fix typo.

gcc/cp/decl2.c

@@ -362,7 +362,7 @@ int flag_weak = 1;
 /* Nonzero to use __cxa_atexit, rather than atexit, to register
    destructors for local statics and global objects.  */
 
-int flag_use_cxa_atexit;
+int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT;
 
 /* Maximum template instantiation depth.  This limit is rather
    arbitrary, but it exists to limit the time it takes to notice

gcc/defaults.h

@@ -496,4 +496,10 @@ You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
 #endif
 
+/* Determine whether __cxa_atexit, rather than atexit, is used to
+   register C++ destructors for local statics and global objects. */
+#ifndef DEFAULT_USE_CXA_ATEXIT
+#define DEFAULT_USE_CXA_ATEXIT 0
+#endif
+
 #endif  /* ! GCC_DEFAULTS_H */