dwarf2out.c (lookup_filename): Emit .file if the assembler is generating .debug_line.

        * dwarf2out.c (lookup_filename): Emit .file if the assembler
        is generating .debug_line.
        (dwarf2out_init): Add main_input_filename to the file table first.
        * configure.in (as_dwarf2_debug_line): Test with file number 1
        instead of file number 0.

From-SVN: r40578

gcc/ChangeLog

+2001-03-17  Richard Henderson  <rth@redhat.com>
+
+	* dwarf2out.c (lookup_filename): Emit .file if the assembler
+	is generating .debug_line.
+	(dwarf2out_init): Add main_input_filename to the file table first.
+	* configure.in (as_dwarf2_debug_line): Test with file number 1
+	instead of file number 0.
+
 Sat Mar 17 11:52:34 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
 	* combine.c (undobuf): Remove field previous_undos; all refs deleted.

gcc/configure

@@ -6752,8 +6752,8 @@ then
     gcc_cv_as_dwarf2_debug_line="yes"
   fi
 elif test x$gcc_cv_as != x -a x"$insn" != x ; then
-	echo '	.file 0 "conftest.s"' > conftest.s
-	echo '	.loc 0 3 0' >> conftest.s
+	echo '	.file 1 "conftest.s"' > conftest.s
+	echo '	.loc 1 3 0' >> conftest.s
 	echo "	$insn" >> conftest.s
 	# ??? This fails with non-gnu grep.
 	if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1 \

gcc/configure.in

@@ -1491,8 +1491,8 @@ then
     gcc_cv_as_dwarf2_debug_line="yes"
   fi
 elif test x$gcc_cv_as != x -a x"$insn" != x ; then
-	echo '	.file 0 "conftest.s"' > conftest.s
-	echo '	.loc 0 3 0' >> conftest.s
+	echo '	.file 1 "conftest.s"' > conftest.s
+	echo '	.loc 1 3 0' >> conftest.s
 	echo "	$insn" >> conftest.s
 	# ??? This fails with non-gnu grep.
 	if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1 \

gcc/dwarf2out.c

@@ -10723,6 +10723,9 @@ lookup_filename (file_name)
   file_table.in_use = i + 1;
   file_table.last_lookup_index = i;
 
+  if (DWARF2_ASM_LINE_DEBUG_INFO)
+    fprintf (asm_out_file, "\t.file %u \"%s\"\n", i, file_name);
+
   return i;
 }
 
@@ -10885,10 +10888,15 @@ dwarf2out_init (asm_out_file, main_input_filename)
      register FILE *asm_out_file;
      register const char *main_input_filename;
 {
+  init_file_table ();
+
   /* Remember the name of the primary input file.  */
   primary_filename = main_input_filename;
 
-  init_file_table ();
+  /* Add it to the file table first, under the assumption that we'll
+     be emitting line number data for it first, which avoids having
+     to add an initial DW_LNS_set_file.  */
+  lookup_filename (main_input_filename);
 
   /* Allocate the initial hunk of the decl_die_table.  */
   decl_die_table