[gcc(refs/users/wschmidt/heads/dd2)] rs6000: Conditionally define __ROP_PROTECT__

[William Schmidt]

https://gcc.gnu.org/g:4d095f34e6d689f253e96be41b955ec3ab0aaaee

commit 4d095f34e6d689f253e96be41b955ec3ab0aaaee
Author: Bill Schmidt <wschmidt@linux.ibm.com>
Date:   Thu Mar 25 11:59:03 2021 -0500

    rs6000: Conditionally define __ROP_PROTECT__
    
    2021-03-25  Bill Schmidt  <wschmidt@linux.ibm.com>
    
    gcc/
            * config/rs6000/rs6000-c.c (rs6000_target_modify_macros):
            Conditionally define __ROP_PROTECT__.

Diff:
---
 gcc/config/rs6000/rs6000-c.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/config/rs6000/rs6000-c.c b/gcc/config/rs6000/rs6000-c.c
index 06b3bc0df33..f79be64a3bb 100644
--- a/gcc/config/rs6000/rs6000-c.c
+++ b/gcc/config/rs6000/rs6000-c.c
@@ -602,6 +602,9 @@ rs6000_target_modify_macros (bool define_p, HOST_WIDE_INT flags,
   /* Whether pc-relative code is being generated.  */
   if ((flags & OPTION_MASK_PCREL) != 0)
     rs6000_define_or_undefine_macro (define_p, "__PCREL__");
+  /* Tell the user -mrop-protect is in play.  */
+  if (rs6000_rop_protect)
+    rs6000_define_or_undefine_macro (define_p, "__ROP_PROTECT__");
 }
 
 void