Hi,

This patch fixes the issue:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67963

  gcc/config/i386/i386.c (ix86_option_override_internal) Disable
    80387 mask if lakemont target is set.

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 4c25c9e..db722aa 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -4943,6 +4943,12 @@ ix86_option_override_internal (bool main_args_p,
  break;
       }

+  if (!strcmp (opts->x_ix86_arch_string, "lakemont"))
+    {
+      opts->x_target_flags &= ~MASK_80387;
+      opts_set->x_target_flags |= MASK_80387;
+    }
+
   if (TARGET_X32 && (opts->x_ix86_isa_flags & OPTION_MASK_ISA_MPX))
     error ("Intel MPX does not support x32");

Ok for trunk?

Yulia

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