2021-03-04  Bill Schmidt  <wschm...@linux.ibm.com>

gcc/
        * config/rs6000/darwin.h (SUBTARGET_INIT_BUILTINS): Use the new
        decl when new_builtins_are_live.
        * config/rs6000/rs6000-builtin-new.def (__builtin_cfstring): New
        built-in.
---
 gcc/config/rs6000/darwin.h               | 8 ++++++--
 gcc/config/rs6000/rs6000-builtin-new.def | 6 ++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/gcc/config/rs6000/darwin.h b/gcc/config/rs6000/darwin.h
index 42f39e60305..6abf8e84f54 100644
--- a/gcc/config/rs6000/darwin.h
+++ b/gcc/config/rs6000/darwin.h
@@ -504,8 +504,12 @@
 #define SUBTARGET_INIT_BUILTINS                                                
\
 do {                                                                   \
   darwin_patch_builtins ();                                            \
-  rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)]           \
-    = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
+  if (new_builtins_are_live)                                           \
+    rs6000_builtin_decls_x[(unsigned) (RS6000_BIF_CFSTRING)]           \
+      = darwin_init_cfstring_builtins ((unsigned) (RS6000_BIF_CFSTRING)); \
+  else                                                                 \
+    rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)]         \
+      = darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
 } while(0)
 
 /* So far, there is no rs6000_fold_builtin, if one is introduced, then
diff --git a/gcc/config/rs6000/rs6000-builtin-new.def 
b/gcc/config/rs6000/rs6000-builtin-new.def
index 4b640cac654..b7e92b05baa 100644
--- a/gcc/config/rs6000/rs6000-builtin-new.def
+++ b/gcc/config/rs6000/rs6000-builtin-new.def
@@ -187,6 +187,12 @@
 ; Builtins that have been around since time immemorial or are just
 ; considered available everywhere.
 [always]
+; __builtin_cfstring is for Darwin, which will replace the decl we
+; create here with another one during subtarget processing.  We just
+; need to ensure it has a slot in the builtin enumeration.
+  void __builtin_cfstring ();
+    CFSTRING nothing {}
+
   void __builtin_cpu_init ();
     CPU_INIT nothing {cpu}
 
-- 
2.27.0

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