config.gcc (default_use_cxa_atexit): New variable, defaults to no.

* config.gcc (default_use_cxa_atexit): New variable, defaults to no.
(*-*-netbsd[2-9]* | *-*-netbsdelf[2-9]*): Set default_use_cxa_atexit
to yes.
* configure.in: Allow default_use_cxa_atexit to determine the
value of DEFAULT_USE_CXA_ATEXIT if not explicitly enabled or
disabled.
* configure: Regenerate.

From-SVN: r67401

gcc/ChangeLog

+2003-06-03  Jason Thorpe  <thorpej@wasabisystems.com>
+
+	* config.gcc (default_use_cxa_atexit): New variable, defaults to no.
+	(*-*-netbsd[2-9]* | *-*-netbsdelf[2-9]*): Set default_use_cxa_atexit
+	to yes.
+	* configure.in: Allow default_use_cxa_atexit to determine the
+	value of DEFAULT_USE_CXA_ATEXIT if not explicitly enabled or
+	disabled.
+	* configure: Regenerate.
+
 2003-06-03  Douglas B Rupp  <rupp@gnat.com>
 
 	* Makefile.in (TEXI_GCC_FILES): Remove vms.texi entry.

gcc/config.gcc

@@ -35,6 +35,11 @@
 #  enable_threads_flag	Either the name, yes or no depending on whether
 #			threads support was requested.
 #
+#  default_use_cxa_atexit
+#			"no" by default, can be set to "yes" if a target
+#			wishes to use __cxa_atexit() by default if the
+#			$enable___cxa_atexit variable is not set.
+#
 #  gas_flag		Either yes or no depending on whether GNU as was
 #			requested.
 #
@@ -221,6 +226,7 @@ thread_file=
 gas="$gas_flag"
 gnu_ld="$gnu_ld_flag"
 enable_threads=$enable_threads_flag
+default_use_cxa_atexit=no
 target_gtfiles=
 need_64bit_hwint=
 
@@ -435,6 +441,14 @@ case $machine in
 		extra_parts="crtbegin.o crtend.o crtbeginS.o crtendS.o crtbeginT.o"
 		;;
 	esac
+
+	# NetBSD 2.0 and later provide __cxa_atexit(), which we use by
+	# default (unless overridden by --disable-__cxa_atexit).
+	case $machine in
+	*-*-netbsd[2-9]* | *-*-netbsdelf[2-9]*)
+		default_use_cxa_atexit=yes
+		;;
+	esac
 	;;
 *-*-freebsd[12] | *-*-freebsd[12].* | *-*-freebsd*aout*)
 	# This is the place-holder for the generic a.out configuration

gcc/configure.in

@@ -481,14 +481,7 @@ AC_SUBST(enable_multilib)
 AC_ARG_ENABLE(__cxa_atexit,
 [  --enable-__cxa_atexit   enable __cxa_atexit for C++],
 [], [])
-if test x$enable___cxa_atexit = xyes; then
-  AC_DEFINE(DEFAULT_USE_CXA_ATEXIT, 1,
-  [Define if you want to use __cxa_atexit, rather than atexit, to
-   register C++ destructors for local statics and global objects.
-   This is essential for fully standards-compliant handling of
-   destructors, but requires __cxa_atexit in libc.])
-fi
-  
+
 # Enable Multibyte Characters for C/C++
 AC_ARG_ENABLE(c-mbchar,
 [  --enable-c-mbchar       enable multibyte characters for C and C++],
@@ -1124,6 +1117,15 @@ if test x$thread_file = x; then
 	fi
 fi
 
+if test x$enable___cxa_atexit = xyes || \
+   test x$enable___cxa_atexit = x -a x$default_use_cxa_atexit = xyes; then
+  AC_DEFINE(DEFAULT_USE_CXA_ATEXIT, 1,
+  [Define if you want to use __cxa_atexit, rather than atexit, to
+   register C++ destructors for local statics and global objects.
+   This is essential for fully standards-compliant handling of
+   destructors, but requires __cxa_atexit in libc.])
+fi
+
 # Look for a file containing extra machine modes.
 if test -n "$extra_modes" && test -f $srcdir/config/$extra_modes; then
   extra_modes_file='$(srcdir)'/config/${extra_modes}