6 files changed, 34 insertions, 1 deletions
diff --git a/gcc/config/gcn/gcn-hsa.h b/gcc/config/gcn/gcn-hsa.h
index 658deac..6904aaa 100644
--- a/gcc/config/gcn/gcn-hsa.h
+++ b/gcc/config/gcn/gcn-hsa.h
@@ -46,6 +46,10 @@
 #define ASM_OUTPUT_LABEL(FILE,NAME) \
   do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
 
+/* Used in lieu of '../elfos.h:ASM_WEAKEN_LABEL'.  */
+#define ASM_WEAKEN_DECL(STREAM, DECL, NAME, VALUE) \
+  gcn_asm_weaken_decl ((STREAM), (DECL), (NAME), (VALUE))
+
 #define ASM_OUTPUT_LABELREF(FILE, NAME) \
   asm_fprintf (FILE, "%U%s", default_strip_name_encoding (NAME))
 
diff --git a/gcc/config/gcn/gcn-protos.h b/gcc/config/gcn/gcn-protos.h
index 87d9092..1e513ba 100644
--- a/gcc/config/gcn/gcn-protos.h
+++ b/gcc/config/gcn/gcn-protos.h
@@ -18,6 +18,8 @@
 #define _GCN_PROTOS_
 
 extern void gcn_asm_output_symbol_ref (FILE *file, rtx x);
+extern void gcn_asm_weaken_decl (FILE *stream, tree decl, const char *name,
+				 const char *value);
 extern tree gcn_builtin_decl (unsigned code, bool initialize_p);
 extern bool gcn_can_split_p (machine_mode, rtx);
 extern bool gcn_constant64_p (rtx);
diff --git a/gcc/config/gcn/gcn.cc b/gcc/config/gcn/gcn.cc
index 48691c3..d59e87b 100644
--- a/gcc/config/gcn/gcn.cc
+++ b/gcc/config/gcn/gcn.cc
@@ -6927,6 +6927,20 @@ gcn_asm_output_symbol_ref (FILE *file, rtx x)
     }
 }
 
+void
+gcn_asm_weaken_decl (FILE *stream, tree decl, const char *name,
+		     const char *value)
+{
+  if (!value
+      && DECL_EXTERNAL (decl))
+    /* Don't emit weak undefined symbols; see PR119369.  */
+    return;
+  if (value)
+    ASM_OUTPUT_WEAK_ALIAS (stream, name, value);
+  else
+    ASM_WEAKEN_LABEL (stream, name);
+}
+
 /* Implement TARGET_CONSTANT_ALIGNMENT.
 
    Returns the alignment in bits of a constant that is being placed in memory.
diff --git a/gcc/config/gcn/gcn.md b/gcc/config/gcn/gcn.md
index 695656f..e0fb735 100644
--- a/gcc/config/gcn/gcn.md
+++ b/gcc/config/gcn/gcn.md
@@ -1018,7 +1018,9 @@
   [(const_int 0)]
   ""
 {
-  sorry ("exception handling not supported");
+  if (!fake_exceptions)
+    sorry ("exception handling not supported");
+  DONE;
 })
 
 ;; }}}
diff --git a/gcc/config/gcn/gcn.opt b/gcc/config/gcn/gcn.opt
index 142b439..99d6aeb 100644
--- a/gcc/config/gcn/gcn.opt
+++ b/gcc/config/gcn/gcn.opt
@@ -101,3 +101,11 @@ Enum(gcn_preferred_vectorization_factor) String(32) Value(32)
 
 EnumValue
 Enum(gcn_preferred_vectorization_factor) String(64) Value(64)
+
+mfake-exceptions
+Target Var(fake_exceptions) Init(0) Undocumented
+; With '-mfake-exceptions' enabled, the user-visible behavior in presence of
+; exception handling constructs changes such that the compile-time
+; 'sorry, unimplemented: exception handling not supported' is skipped, code
+; generation proceeds, and instead, exception handling constructs 'abort' at
+; run time.  (..., or don't, if they're in dead code.)
diff --git a/gcc/config/gcn/mkoffload.cc b/gcc/config/gcn/mkoffload.cc
index f5b89c9..b284ff4 100644
--- a/gcc/config/gcn/mkoffload.cc
+++ b/gcc/config/gcn/mkoffload.cc
@@ -1160,6 +1160,9 @@ main (int argc, char **argv)
   obstack_ptr_grow (&cc_argv_obstack, "-xlto");
   if (fopenmp)
     obstack_ptr_grow (&cc_argv_obstack, "-mgomp");
+  /* The host code may contain exception handling constructs.
+     Handle these as good as we can.  */
+  obstack_ptr_grow (&cc_argv_obstack, "-mfake-exceptions");
 
   for (int ix = 1; ix != argc; ix++)
     {