bpf: disable tail call optimization in BPF targets

clang disables tail call optimizations in BPF targets.  Do the same in
GCC.

gcc/ChangeLog:

	* config/bpf/bpf.cc (bpf_option_override): Disable tail-call
	optimizations in BPF target.

diff --git a/gcc/config/bpf/bpf.cc b/gcc/config/bpf/bpf.cc
index b5b5674edbb5d9e571604eecfb7b99b0a8ddd3ae..57817cdf2f86d64bb73c48384232124ffccf2f78 100644 (file)
--- a/gcc/config/bpf/bpf.cc
+++ b/gcc/config/bpf/bpf.cc
@@ -273,6 +273,9 @@ bpf_option_override (void)
              "on this architecture");
       flag_stack_protect = 0;
     }
+
+  /* The BPF target does not support tail call optimization.  */
+  flag_optimize_sibling_calls = 0;
 }
 
 #undef TARGET_OPTION_OVERRIDE