builtins.c (expand_builtin_strlen): Make sure that we have something at the…

builtins.c (expand_builtin_strlen): Make sure that we have something at the beginning of the sequence.

        * builtins.c (expand_builtin_strlen): Make sure that we have something
        at the beginning of the sequence.

        * toplev.c (rest_of_compilation): Also set TREE_NOTHROW for
        deferred inlines.

        * invoke.texi (C++ Dialect Options): Document -fno-enforce-eh-specs.

From-SVN: r32473

gcc/ChangeLog

+2000-03-10  Jason Merrill  <jason@casey.cygnus.com>
+
+	* builtins.c (expand_builtin_strlen): Make sure that we have something
+	at the beginning of the sequence.
+
+	* toplev.c (rest_of_compilation): Also set TREE_NOTHROW for
+	deferred inlines.
+
+	* invoke.texi (C++ Dialect Options): Document -fno-enforce-eh-specs.
+
 2000-03-10  Richard Henderson  <rth@cygnus.com>
 
 	* except.c (can_throw): Use INTVAL on a CONST_INT.

gcc/builtins.c

@@ -1381,6 +1381,8 @@ expand_builtin_strlen (exp, target, mode)
       /* Mark the beginning of the strlen sequence so we can emit the
 	 source operand later.  */
       before_strlen = get_last_insn();
+      if (before_strlen == NULL_RTX)
+	before_strlen = emit_note (0, NOTE_INSN_DELETED);
 
       /* Check the string is readable and has an end.  */
       if (current_function_check_memory_usage)

gcc/invoke.texi

@@ -1064,6 +1064,12 @@ which is only used to initialize another object of the same type.
 Specifying this option disables that optimization, and forces g++ to
 call the copy constructor in all cases.
 
+@item -fno-enforce-eh-specs
+Don't check for violation of exception specifications at runtime.  This
+option violates the C++ standard, but may be useful for reducing code
+size in production builds, much like defining @samp{NDEBUG}.  The compiler
+will still optimize based on the exception specifications.
+
 @item -fexternal-templates
 Cause template instantiations to obey @samp{#pragma interface} and
 @samp{implementation}; template instances are emitted or not according

gcc/toplev.c

@@ -2967,6 +2967,12 @@ rest_of_compilation (decl)
 	      optimize = saved_optimize;
 	    }
 
+	  current_function_nothrow = nothrow_function_p ();
+	  if (current_function_nothrow)
+	    /* Now we know that this can't throw; set the flag for the benefit
+	       of other functions later in this translation unit.  */
+	    TREE_NOTHROW (current_function_decl) = 1;
+
 	  note_deferral_of_defined_inline_function (decl);
 	  TIMEVAR (integration_time, save_for_inline_nocopy (decl));
 	  DECL_SAVED_INSNS (decl)->inlinable = inlinable;