1 files changed, 62 insertions, 0 deletions
diff --git a/libgomp/config/accel/target-cxa-dso-dtor.c b/libgomp/config/accel/target-cxa-dso-dtor.c
new file mode 100644
index 0000000..e40a5f0
--- /dev/null
+++ b/libgomp/config/accel/target-cxa-dso-dtor.c
@@ -0,0 +1,62 @@
+/* Host/device compatibility: Itanium C++ ABI, DSO Object Destruction API
+
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+   This file is part of the GNU Offloading and Multi Processing Library
+   (libgomp).
+
+   Libgomp is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "libgomp.h"
+
+extern void __cxa_finalize (void *);
+
+/* See <https://itanium-cxx-abi.github.io/cxx-abi/abi.html#dso-dtor>.
+
+   Even if the device is '!DEFAULT_USE_CXA_ATEXIT', we may see '__cxa_atexit'
+   calls, referencing '__dso_handle', via a 'DEFAULT_USE_CXA_ATEXIT' host.
+   '__cxa_atexit' is provided by newlib, but use of '__dso_handle' for nvptx
+   results in 'ld' error:
+
+       unresolved symbol __dso_handle
+       collect2: error: ld returned 1 exit status
+       nvptx mkoffload: fatal error: [...]/x86_64-pc-linux-gnu-accel-nvptx-none-gcc returned 1 exit status
+
+   ..., or for GCN get an implicit definition (running with
+   '--trace-symbol=__dso_handle'):
+
+       ./a.xamdgcn-amdhsa.mkoffload.hsaco-a.xamdgcn-amdhsa.mkoffload.2.o: reference to __dso_handle
+       <internal>: definition of __dso_handle
+
+   ..., which might be fine, but let's just make it explicit.  */
+
+/* There are no DSOs; this is the main program.  */
+attribute_hidden void * const __dso_handle = 0;
+
+/* If this file gets linked in, that means that '__dso_handle' has been
+   referenced (for '__cxa_atexit'), and in that case, we also have to run
+   '__cxa_finalize'.  Make that happen by overriding the weak libgcc dummy
+   function '__GCC_offload___cxa_finalize'.  */
+
+void
+__GCC_offload___cxa_finalize (void *dso_handle)
+{
+  __cxa_finalize (dso_handle);
+}