[PATCH 4/7] provide default for HAVE_mem_signal_fence

[tbsaunde+gcc]

From: Trevor Saunders <tbsaunde+...@tbsaunde.org>

gcc/ChangeLog:

2015-05-23  Trevor Saunders  <tbsaunde+...@tbsaunde.org>

        * defaults.h (gen_mem_signal_fence): New function.
        (HAVE_mem_signal_fence): Add default value.
        * optabs.c: Adjust.
---
 gcc/ChangeLog  |  6 ++++++
 gcc/defaults.h | 10 ++++++++++
 gcc/optabs.c   |  5 -----
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cd0358a..5e540b6 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,11 @@
 2015-05-23  Trevor Saunders  <tbsaunde+...@tbsaunde.org>
 
+       * defaults.h (gen_mem_signal_fence): New function.
+       (HAVE_mem_signal_fence): Add default value.
+       * optabs.c: Adjust.
+
+2015-05-23  Trevor Saunders  <tbsaunde+...@tbsaunde.org>
+
        * defaults.h (gen_memory_barrier): New function.
        (HAVE_memory_barrier): Add default value.
        * optabs.c: Adjust.
diff --git a/gcc/defaults.h b/gcc/defaults.h
index a7455e5..50004d5 100644
--- a/gcc/defaults.h
+++ b/gcc/defaults.h
@@ -1464,6 +1464,16 @@ gen_memory_barrier ()
 }
 #endif
 
+#ifndef HAVE_mem_signal_fence
+#define HAVE_mem_signal_fence 0
+static inline rtx
+gen_mem_signal_fence (rtx)
+{
+  gcc_unreachable ();
+  return NULL;
+}
+#endif
+
 #endif /* GCC_INSN_FLAGS_H  */
 
 #endif  /* ! GCC_DEFAULTS_H */
diff --git a/gcc/optabs.c b/gcc/optabs.c
index d3c1d21..49e1c53 100644
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -7608,11 +7608,6 @@ expand_mem_thread_fence (enum memmodel model)
 /* This routine will either emit the mem_signal_fence pattern or issue a 
    sync_synchronize to generate a fence for memory model MEMMODEL.  */
 
-#ifndef HAVE_mem_signal_fence
-# define HAVE_mem_signal_fence 0
-# define gen_mem_signal_fence(x) (gcc_unreachable (), NULL_RTX)
-#endif
-
 void
 expand_mem_signal_fence (enum memmodel model)
 {
-- 
2.4.0.78.g7c6ecbf