varasm.c (incorporeal_function_p): New.

	* varasm.c (incorporeal_function_p): New.
	(assemble_external): Use it as a filter.
	* config/mips/mips.c (mips_output_external): Don't check for builtin
	functions here.

From-SVN: r74368

1 files changed, 28 insertions, 1 deletions

diff --git a/gcc/varasm.c b/gcc/varasm.c
index 7f5ee56..5257810 100644
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -137,6 +137,9 @@ static HOST_WIDE_INT const_alias_set;
 
 static const char *strip_reg_name (const char *);
 static int contains_pointers_p (tree);
+#ifdef ASM_OUTPUT_EXTERNAL
+static bool incorporeal_function_p (tree);
+#endif
 static void decode_addr_const (tree, struct addr_const *);
 static hashval_t const_desc_hash (const void *);
 static int const_desc_eq (const void *, const void *);
@@ -1599,6 +1602,29 @@ contains_pointers_p (tree type)
     }
 }
 
+#ifdef ASM_OUTPUT_EXTERNAL
+/* True if DECL is a function decl for which no out-of-line copy exists.
+   It is assumed that DECL's assembler name has been set.  */
+
+static bool
+incorporeal_function_p (tree decl)
+{
+  if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
+    {
+      const char *name;
+
+      if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
+	  && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
+	return true;
+
+      name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
+      if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
+	return true;
+    }
+  return false;
+}
+#endif
+
 /* Output something to declare an external symbol to the assembler.
    (Most assemblers don't need this, so we normally output nothing.)
    Do nothing if DECL is not external.  */
@@ -1619,7 +1645,8 @@ assemble_external (tree decl ATTRIBUTE_UNUSED)
       rtx rtl = DECL_RTL (decl);
 
       if (GET_CODE (rtl) == MEM && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
-	  && ! SYMBOL_REF_USED (XEXP (rtl, 0)))
+	  && !SYMBOL_REF_USED (XEXP (rtl, 0))
+	  && !incorporeal_function_p (decl))
 	{
 	  /* Some systems do require some output.  */
 	  SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;