re PR target/46655 (invalid '.line 0' directive emitted with -g)

	PR target/46655
	* xcoffout.c (ASM_OUTPUT_LINE): Output line only if positive, and only
	if <= USHRT_MAX in 32-bit mode.

Co-Authored-By: Eric Botcazou <ebotcazou@adacore.com>
Co-Authored-By: Michael Haubenwallner <michael.haubenwallner@salomon.at>

From-SVN: r168897

gcc/ChangeLog

+2011-01-17  Olivier Hainque  <hainque@adacore.com>
+            Michael Haubenwallner  <michael.haubenwallner@salomon.at>
+            Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR target/46655
+	* xcoffout.c (ASM_OUTPUT_LINE): Output line only if positive, and only
+	if <= USHRT_MAX in 32-bit mode.
+
 2011-01-17  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	* doc/install.texi (Configuration, Specific): Wrap long

gcc/xcoffout.c

@@ -81,8 +81,15 @@ const char *xcoff_lastfile;
 #define ASM_OUTPUT_LINE(FILE,LINENUM)					   \
   do									   \
     {									   \
+      /* Make sure we're in a function and prevent output of .line 0, as   \
+	 line # 0 is meant for symbol addresses in xcoff.  Additionally,   \
+	 line numbers are 'unsigned short' in 32-bit mode.  */		   \
       if (xcoff_begin_function_line >= 0)				   \
-	fprintf (FILE, "\t.line\t%d\n", ABS_OR_RELATIVE_LINENO (LINENUM)); \
+	{								   \
+	  int lno = ABS_OR_RELATIVE_LINENO (LINENUM);			   \
+	  if (lno > 0 && (TARGET_64BIT || lno <= (int)USHRT_MAX))	   \
+	    fprintf (FILE, "\t.line\t%d\n", lno);			   \
+	}								   \
     }									   \
   while (0)