[gcc(refs/users/wschmidt/heads/builtins10)] rs6000: Write output to the builtin definition include file

[William Schmidt <wschmidt@gcc.gnu.org>]

https://gcc.gnu.org/g:4f0be88685f01823fe84a2496830272a7807a660

commit 4f0be88685f01823fe84a2496830272a7807a660
Author: Bill Schmidt <wschmidt@linux.ibm.com>
Date:   Fri Apr 2 16:40:21 2021 -0500

    rs6000: Write output to the builtin definition include file
    
    2021-04-02  Bill Schmidt  <wschmidt@linux.ibm.com>
    
    gcc/
            * config/rs6000/rs6000-gen-builtins.c (write_defines_file):
            Implement.

Diff:
---
 gcc/config/rs6000/rs6000-gen-builtins.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gcc/config/rs6000/rs6000-gen-builtins.c b/gcc/config/rs6000/rs6000-gen-builtins.c
index 0358ff26414..4fe2748e947 100644
--- a/gcc/config/rs6000/rs6000-gen-builtins.c
+++ b/gcc/config/rs6000/rs6000-gen-builtins.c
@@ -2040,6 +2040,23 @@ write_init_file ()
 static int
 write_defines_file ()
 {
+  fprintf (defines_file, "#ifndef _RS6000_VECDEFINES_H\n");
+  fprintf (defines_file, "#define _RS6000_VECDEFINES_H 1\n\n");
+  fprintf (defines_file, "#if defined(_ARCH_PPC64) && defined (_ARCH_PWR9)\n");
+  fprintf (defines_file, "  #define _ARCH_PPC64_PWR9 1\n");
+  fprintf (defines_file, "#endif\n\n");
+  for (int i = 0; i < num_ovld_stanzas; i++)
+    if (strcmp (ovld_stanzas[i].extern_name, "SKIP"))
+      {
+	if (ovld_stanzas[i].ifdef)
+	  fprintf (defines_file, "#ifdef %s\n", ovld_stanzas[i].ifdef);
+	fprintf (defines_file, "#define %s %s\n",
+		 ovld_stanzas[i].extern_name,
+		 ovld_stanzas[i].intern_name);
+	if (ovld_stanzas[i].ifdef)
+	  fprintf (defines_file, "#endif\n");
+      }
+  fprintf (defines_file, "\n#endif\n");
   return 1;
 }