[PATCH v2 7/7] aarch64: Add __HAVE_FUNCTION_MULTI_VERSIONING macro.

[alfie.richards]

From: Alfie Richards <alfie.richa...@arm.com>

gcc/ChangeLog:

        * config/aarch64/aarch64-c.cc (aarch64_update_cpp_builtins): Add
        __HAVE_FUNCTION_MULTI_VERSIONING macro.
---
 gcc/config/aarch64/aarch64-c.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/config/aarch64/aarch64-c.cc b/gcc/config/aarch64/aarch64-c.cc
index a8ff58e4994..c3957c762ef 100644
--- a/gcc/config/aarch64/aarch64-c.cc
+++ b/gcc/config/aarch64/aarch64-c.cc
@@ -296,6 +296,10 @@ aarch64_update_cpp_builtins (cpp_reader *pfile)
                        "__ARM_FEATURE_SME2p1", pfile);
   aarch64_def_or_undef (TARGET_FAMINMAX, "__ARM_FEATURE_FAMINMAX", pfile);
 
+  // Function multi-versioning defines
+  aarch64_def_or_undef (targetm.has_ifunc_p (),
+                       "__HAVE_FUNCTION_MULTI_VERSIONING", pfile);
+
   /* Not for ACLE, but required to keep "float.h" correct if we switch
      target between implementations that do or do not support ARMv8.2-A
      16-bit floating-point extensions.  */
-- 
2.34.1