[gcc(refs/users/wschmidt/heads/dd2)] rs6000: Error when -mrop-protect requested without ELFv2 ABI

[William Schmidt]

https://gcc.gnu.org/g:30db970ead2c75a044f9035d3ae2b5f1393d6fbb

commit 30db970ead2c75a044f9035d3ae2b5f1393d6fbb
Author: Bill Schmidt <wschmidt@linux.ibm.com>
Date:   Thu Mar 18 09:33:59 2021 -0500

    rs6000: Error when -mrop-protect requested without ELFv2 ABI
    
    2021-03-18  Bill Schmidt  <wschmidt@linux.ibm.com>
    
    gcc/
            * config/rs6000/rs6000.c (rs6000_option_override_internal): Error
            if -mrop-protect requested without ELFv2 ABI.

Diff:
---
 gcc/config/rs6000/rs6000.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index a3e53ed57fc..bdcf536bfa5 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4012,6 +4012,10 @@ rs6000_option_override_internal (bool global_init_p)
       && ((rs6000_isa_flags_explicit & OPTION_MASK_QUAD_MEMORY_ATOMIC) == 0))
     rs6000_isa_flags |= OPTION_MASK_QUAD_MEMORY_ATOMIC;
 
+  /* ROP protection is only enabled for ELFv2 at the moment.  */
+  if (rs6000_rop_protect && DEFAULT_ABI != ABI_ELFv2)
+    error ("%qs requires the ELFv2 ABI", "-mrop-protect");
+
   /* If we are inserting ROP-protect instructions, disable shrink wrap.  */
   if (rs6000_rop_protect)
     {