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PATCH: Add --enable-__cxa_atexit


On Fri, May 31, 2002 at 12:04:24PM -0400, Jack Howarth wrote:
> HJ,
>    That is a patch one of the debian gcc packagers added in to
> their current gcc-3.1 source package. The reason for it is unclear.
> I noticed that Mark Mitchell is the person checking in code 
> related to the use of __cxa_atexit in that manner so I just emailed
> him to ask about the rationality of that patch. My instinct is that 
> this is toggling on code that has not been throughly tested in 
> gcc 3.1 since it doesn't exist as a configure --enable- type option.
> I'll pass your comments back to them.

Here is a patch.


H.J.
---
2002-05-31  H.J. Lu  (hjl@gnu.org)

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

2002-05-31  H.J. Lu  (hjl@gnu.org)

	* decl2.c (flag_use_cxa_atexit): Set to 1 if ENABLE_CXA_ATEXIT
	is defined.

--- gcc/config.in.atexit	Mon May 27 20:24:25 2002
+++ gcc/config.in	Fri May 31 10:26:20 2002
@@ -307,6 +307,10 @@
    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. */
+#undef ENABLE_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.atexit	Fri May 31 10:26:20 2002
+++ gcc/configure.in	Fri May 31 10:39:32 2002
@@ -269,6 +269,16 @@ 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++],
+[], [enable___cxa_atexit=no])
+if test x$enable___cxa_atexit != xno; then
+  AC_DEFINE(ENABLE_CXA_ATEXIT, 1,
+  [Define if you want to use __cxa_atexit, rather than, atexit to
+   register C++ destructors for local statics and global objects.])
+fi
+  
 # Enable Multibyte Characters for C/C++
 AC_ARG_ENABLE(c-mbchar,
 [  --enable-c-mbchar       enable multibyte characters for C and C++],
--- gcc/cp/decl2.c.atexit	Sun May 26 21:02:04 2002
+++ gcc/cp/decl2.c	Fri May 31 10:26:20 2002
@@ -362,7 +362,11 @@ int flag_weak = 1;
 /* Nonzero to use __cxa_atexit, rather than atexit, to register
    destructors for local statics and global objects.  */
 
+#ifdef ENABLE_CXA_ATEXIT
+int flag_use_cxa_atexit = 1;
+#else
 int flag_use_cxa_atexit;
+#endif
 
 /* Maximum template instantiation depth.  This limit is rather
    arbitrary, but it exists to limit the time it takes to notice


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