ChangeLog:

2011-03-16  Paul Pluzhnikov  <ppluzhnikov@google.com>

	PR gdb/12528
	* dwarf2read.c (noop_record_line): New function.
	(dwarf_decode_lines): Ignore line tables for GCd functions.

testsuite/ChangeLog:

2011-03-16  Paul Pluzhnikov  <ppluzhnikov@google.com>

	PR gdb/12528
	* gdb.base/Makefile.in: Adjust EXECUTABLES.
	* gdb.base/break-on-linker-gcd-function.exp: New test.
	* gdb.base/break-on-linker-gcd-function.cc: New file.

1 files changed, 32 insertions, 5 deletions

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 5d498d5..810f66a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -10364,6 +10364,14 @@ psymtab_include_file_name (const struct line_header *lh, int file_index,
   return include_name;
 }
 
+/* Ignore this record_line request.  */
+
+static void
+noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
+{
+  return;
+}
+
 /* Decode the Line Number Program (LNP) for the given line_header
    structure and CU.  The actual information extracted and the type
    of structures created from the LNP depends on the value of PST.
@@ -10399,6 +10407,8 @@ dwarf_decode_lines (struct line_header *lh, const char *comp_dir, bfd *abfd,
   struct gdbarch *gdbarch = get_objfile_arch (objfile);
   const int decode_for_pst_p = (pst != NULL);
   struct subfile *last_subfile = NULL, *first_subfile = current_subfile;
+  void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
+    = record_line;
 
   baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
 
@@ -10468,13 +10478,13 @@ dwarf_decode_lines (struct line_header *lh, const char *comp_dir, bfd *abfd,
 			{
 			  addr = gdbarch_addr_bits_remove (gdbarch, address);
 			  if (last_subfile)
-			    record_line (last_subfile, 0, addr);
+			    (*p_record_line) (last_subfile, 0, addr);
 			  last_subfile = current_subfile;
 			}
 		      /* Append row to matrix using current values.  */
 		      addr = check_cu_functions (address, cu);
 		      addr = gdbarch_addr_bits_remove (gdbarch, addr);
-		      record_line (current_subfile, line, addr);
+		      (*p_record_line) (current_subfile, line, addr);
 		    }
 		}
 	      basic_block = 0;
@@ -10491,10 +10501,27 @@ dwarf_decode_lines (struct line_header *lh, const char *comp_dir, bfd *abfd,
 	      switch (extended_op)
 		{
 		case DW_LNE_end_sequence:
+		  p_record_line = record_line;
 		  end_sequence = 1;
 		  break;
 		case DW_LNE_set_address:
 		  address = read_address (abfd, line_ptr, cu, &bytes_read);
+
+		  if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
+		    {
+		      /* This line table is for a function which has been
+			 GCd by the linker.  Ignore it.  PR gdb/12528 */
+
+		      long line_offset
+			= line_ptr - dwarf2_per_objfile->line.buffer;
+
+		      complaint (&symfile_complaints,
+				 _(".debug_line address at offset 0x%lx is 0 "
+				   "[in module %s]"),
+				 line_offset, cu->objfile->name);
+		      p_record_line = noop_record_line;
+		    }
+
 		  op_index = 0;
 		  line_ptr += bytes_read;
 		  address += baseaddr;
@@ -10551,12 +10578,12 @@ dwarf_decode_lines (struct line_header *lh, const char *comp_dir, bfd *abfd,
 			{
 			  addr = gdbarch_addr_bits_remove (gdbarch, address);
 			  if (last_subfile)
-			    record_line (last_subfile, 0, addr);
+			    (*p_record_line) (last_subfile, 0, addr);
 			  last_subfile = current_subfile;
 			}
 		      addr = check_cu_functions (address, cu);
 		      addr = gdbarch_addr_bits_remove (gdbarch, addr);
-		      record_line (current_subfile, line, addr);
+		      (*p_record_line) (current_subfile, line, addr);
 		    }
 		}
 	      basic_block = 0;
@@ -10655,7 +10682,7 @@ dwarf_decode_lines (struct line_header *lh, const char *comp_dir, bfd *abfd,
           if (!decode_for_pst_p)
 	    {
 	      addr = gdbarch_addr_bits_remove (gdbarch, address);
-	      record_line (current_subfile, 0, addr);
+	      (*p_record_line) (current_subfile, 0, addr);
 	    }
         }
     }