[patch] info-fun-opt.exp

[patch] info-fun-opt.exp

[Doug Evans]

Hi.

Regardless of how we fix the issue outlined here:

http://sourceware.org/ml/gdb-patches/2012-06/msg00109.html

here's a testcase that triggers the issue.
I will check it in once we decide on a fix.

When run with current cvs gdb and a recent gcc it hits the
assert failure in dw2_find_pc_sect_symtab when used with cc-with-index.sh.

(gdb) info fun foo
../../gdb.git/gdb/dwarf2read.c:3049: internal-error: dw2_find_pc_sect_symtab: Assertion `result != NULL' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) FAIL: gdb.opt/info-fun-opt.exp: info fun foo (GDB internal error)


2012-06-04  Doug Evans  <dje@google.com>

	* gdb.opt/info-fun-opt.cc: New file.
	* gdb.opt/info-fun-opt.exp: New file.

Index: gdb.opt/info-fun-opt.cc
===================================================================
RCS file: gdb.opt/info-fun-opt.cc
diff -N gdb.opt/info-fun-opt.cc
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gdb.opt/info-fun-opt.cc	5 Jun 2012 06:27:47 -0000
@@ -0,0 +1,40 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+class B1
+{
+ public:
+  virtual int foo () { return 1; }
+};
+
+class B2
+{
+ public:
+  virtual int foo () { return 2; }
+};
+
+class M : public B1, B2
+{
+ public:
+  virtual int foo () { return dynamic_cast<B1*>(this)->foo (); }
+};
+
+int
+main ()
+{
+  M *m = new M;
+
+  return m->foo ();
+}
Index: gdb.opt/info-fun-opt.exp
===================================================================
RCS file: gdb.opt/info-fun-opt.exp
diff -N gdb.opt/info-fun-opt.exp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gdb.opt/info-fun-opt.exp	5 Jun 2012 06:27:47 -0000
@@ -0,0 +1,29 @@
+# Copyright 2012 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# This file is part of the gdb testsuite.
+
+# Test "info fun" on optimized code.
+# This exercises the use of blockvector.map when tested with cc-with-index.sh.
+
+set basename "info-fun-opt"
+set testfile $basename
+
+if { [prepare_for_testing $testfile.exp $testfile $testfile.cc \
+          {debug c++ optimize=-O2}] } {
+    return -1
+}
+
+gdb_test "info fun foo" "File.*info-fun-opt.*foo.*foo.*foo.*"

Re: [patch] info-fun-opt.exp

[Yao Qi]

On 06/05/2012 02:35 PM, Doug Evans wrote:
> +# Test "info fun" on optimized code.
> +# This exercises the use of blockvector.map when tested with cc-with-index.sh.
> +

Hi, Doug,
It is a c++ test, so you may need this check

if {[skip_cplus_tests]} {
    continue
}

> +set basename "info-fun-opt"
> +set testfile $basename

-- 
Yao (齐尧)

Re: [patch] info-fun-opt.exp

[Jan Kratochvil]

On Tue, 05 Jun 2012 08:35:06 +0200, Doug Evans wrote:
> (gdb) info fun foo
> ../../gdb.git/gdb/dwarf2read.c:3049: internal-error: dw2_find_pc_sect_symtab: Assertion `result != NULL' failed.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
> Quit this debugging session? (y or n) FAIL: gdb.opt/info-fun-opt.exp: info fun foo (GDB internal error)
> 
> 
> 2012-06-04  Doug Evans  <dje@google.com>
> 
> 	* gdb.opt/info-fun-opt.cc: New file.
> 	* gdb.opt/info-fun-opt.exp: New file.

I would prefer the patch below as a dependency on specific compiler output has
proven to be fragile.  In this case the important was ELF symbol:
	0000000000400750 W non-virtual thunk to M::foo()


Thanks,
Jan


gdb/testsuite/
2012-06-06  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.dwarf2/dw2-minsym-in-cu.S: New file.
	* gdb.dwarf2/dw2-minsym-in-cu.exp: New file.

diff --git a/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.S b/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.S
new file mode 100644
index 0000000..2f8068e
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.S
@@ -0,0 +1,108 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2004, 2007-2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+	.text
+.Lbegin_text1:
+
+	.globl main
+	.type main, %function
+main:
+.Lbegin_main:
+	.int 0
+.Lend_main:
+	.size main, .-main
+
+	.globl func2
+	.type func2, %function
+func2:
+	.int 0
+	.size func2, .-func2
+
+.Lend_text1:
+
+/* Debug information */
+
+	.section .debug_info
+.Lcu1_begin:
+	/* CU header */
+	.4byte	.Lcu1_end - .Lcu1_start		/* Length of Compilation Unit */
+.Lcu1_start:
+	.2byte	2				/* DWARF Version */
+	.4byte	.Labbrev1_begin			/* Offset into abbrev section */
+	.byte	4				/* Pointer size */
+
+	/* CU die */
+	.uleb128 1				/* Abbrev: DW_TAG_compile_unit */
+	.4byte	.Lend_text1			/* DW_AT_high_pc */
+	.4byte	.Lbegin_text1			/* DW_AT_low_pc */
+	.ascii	"file1.txt\0"			/* DW_AT_name */
+	.ascii	"GNU C 3.3.3\0"			/* DW_AT_producer */
+	.byte	1				/* DW_AT_language (C) */
+
+	/* main */
+	.uleb128	2			/* Abbrev: DW_TAG_subprogram */
+	.byte		1			/* DW_AT_external */
+	.ascii		"main\0"		/* DW_AT_name */
+	.4byte	.Ldebug_ranges			/* DW_AT_ranges */
+
+	.byte		0			/* End of children of CU */
+.Lcu1_end:
+
+/* DW_AT_ranges.  */
+	.section	.debug_ranges
+.Ldebug_ranges:
+	.4byte	.Lbegin_main
+	.4byte	.Lend_main - 1
+	/* Make it slightly more interesting to set pending_addrmap_interesting.  */
+	.4byte	.Lend_main - 1
+	.4byte	.Lend_main
+	.4byte	0
+	.4byte	0
+
+/* Abbrev table */
+	.section .debug_abbrev
+.Labbrev1_begin:
+	.uleb128	1			/* Abbrev code */
+	.uleb128	0x11			/* DW_TAG_compile_unit */
+	.byte		1			/* has_children */
+	.uleb128	0x12			/* DW_AT_high_pc */
+	.uleb128	0x1			/* DW_FORM_addr */
+	.uleb128	0x11			/* DW_AT_low_pc */
+	.uleb128	0x1			/* DW_FORM_addr */
+	.uleb128	0x3			/* DW_AT_name */
+	.uleb128	0x8			/* DW_FORM_string */
+	.uleb128	0x25			/* DW_AT_producer */
+	.uleb128	0x8			/* DW_FORM_string */
+	.uleb128	0x13			/* DW_AT_language */
+	.uleb128	0xb			/* DW_FORM_data1 */
+	.byte		0x0			/* Terminator */
+	.byte		0x0			/* Terminator */
+
+	.uleb128	2			/* Abbrev code */
+	.uleb128	0x2e			/* DW_TAG_subprogram */
+	.byte		0			/* has_children */
+	.uleb128	0x3f			/* DW_AT_external */
+	.uleb128	0xc			/* DW_FORM_flag */
+	.uleb128	0x3			/* DW_AT_name */
+	.uleb128	0x8			/* DW_FORM_string */
+	.uleb128	0x55			/* DW_AT_ranges */
+	.uleb128	0x6			/* DW_FORM_data4 */
+	.byte		0x0			/* Terminator */
+	.byte		0x0			/* Terminator */
+
+	.byte		0x0			/* Terminator */
+	.byte		0x0			/* Terminator */
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.exp b/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.exp
new file mode 100644
index 0000000..60e80c9
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.exp
@@ -0,0 +1,34 @@
+# Copyright 2004-2005, 2007-2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+load_lib dwarf.exp
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+if {![dwarf2_support]} {
+    return 0  
+}
+
+# This testfile has reproducibility only with cc-with-index.sh.
+
+set testfile "dw2-minsym-in-cu"
+set srcfile ${testfile}.S
+set executable ${testfile}
+
+if [prepare_for_testing ${testfile}.exp ${executable} ${srcfile}] {
+    return -1
+}
+
+# Ask for address which is still located in this CU but not described by
+# any DIE.
+gdb_test "info fun func2"

[commit] [patch] info-fun-opt.exp

[Jan Kratochvil]

Hi Doug,

checked in.


Thanks,
Jan


http://sourceware.org/ml/gdb-cvs/2012-07/msg00096.html

--- src/gdb/ChangeLog	2012/07/13 20:15:50	1.14462
+++ src/gdb/ChangeLog	2012/07/13 20:26:09	1.14463
@@ -1,4 +1,16 @@
 2012-07-13  Jan Kratochvil  <jan.kratochvil@redhat.com>
+	    Doug Evans  <dje@google.com>
+
+	* buildsym.c (end_symtab_1): Split it to ...
+	(end_symtab_get_static_block): ... this ...
+	(end_symtab_from_static_block): ... and this function.
+	(end_symtab, end_expandable_symtab): Call them.
+	* buildsym.h (end_symtab_get_static_block)
+	(end_symtab_from_static_block): New declarations.
+	* dwarf2read.c (process_full_comp_unit): New variable static_block.
+	Set its valid CU ranges.
+
+2012-07-13  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* dwarf2loc.c (disassemble_dwarf_expression): Handle
 	DW_OP_GNU_parameter_ref.
--- src/gdb/testsuite/ChangeLog	2012/07/13 08:14:36	1.3291
+++ src/gdb/testsuite/ChangeLog	2012/07/13 20:26:10	1.3292
@@ -1,4 +1,10 @@
 2012-07-13  Jan Kratochvil  <jan.kratochvil@redhat.com>
+	    Doug Evans  <dje@google.com>
+
+	* gdb.dwarf2/dw2-minsym-in-cu.S: New file.
+	* gdb.dwarf2/dw2-minsym-in-cu.exp: New file.
+
+2012-07-13  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	Fix gdbserver run regression.
 	* gdb.trace/disconnected-tracing.exp (executabel): Fix typo.
--- src/gdb/buildsym.c	2012/07/10 20:20:15	1.100
+++ src/gdb/buildsym.c	2012/07/13 20:26:10	1.101
@@ -957,42 +957,28 @@
     }
 }
 
-/* Finish the symbol definitions for one main source file, close off
-   all the lexical contexts for that file (creating struct block's for
-   them), then make the struct symtab for that file and put it in the
-   list of all such.
-
-   END_ADDR is the address of the end of the file's text.  SECTION is
-   the section number (in objfile->section_offsets) of the blockvector
-   and linetable.
-
-   If EXPANDABLE is non-zero the dictionaries for the global and static
-   blocks are made expandable.
-
-   Note that it is possible for end_symtab() to return NULL.  In
-   particular, for the DWARF case at least, it will return NULL when
-   it finds a compilation unit that has exactly one DIE, a
-   TAG_compile_unit DIE.  This can happen when we link in an object
-   file that was compiled from an empty source file.  Returning NULL
-   is probably not the correct thing to do, because then gdb will
-   never know about this empty file (FIXME).  */
-
-static struct symtab *
-end_symtab_1 (CORE_ADDR end_addr, struct objfile *objfile, int section,
-	      int expandable)
+/* Implementation of the first part of end_symtab.  It allows modifying
+   STATIC_BLOCK before it gets finalized by end_symtab_from_static_block.
+   If the returned value is NULL there is no blockvector created for
+   this symtab (you still must call end_symtab_from_static_block).
+
+   END_ADDR is the same as for end_symtab: the address of the end of the
+   file's text.
+
+   If EXPANDABLE is non-zero the STATIC_BLOCK dictionary is made
+   expandable.  */
+
+struct block *
+end_symtab_get_static_block (CORE_ADDR end_addr, struct objfile *objfile,
+			     int expandable)
 {
-  struct symtab *symtab = NULL;
-  struct blockvector *blockvector;
-  struct subfile *subfile;
-  struct context_stack *cstk;
-  struct subfile *nextsub;
-
   /* Finish the lexical context of the last function in the file; pop
      the context stack.  */
 
   if (context_stack_depth > 0)
     {
-      cstk = pop_context ();
+      struct context_stack *cstk = pop_context ();
+
       /* Make a block for the local symbols within.  */
       finish_block (cstk->name, &local_symbols, cstk->old_blocks,
 		    cstk->start_addr, end_addr, objfile);
@@ -1058,18 +1044,51 @@
       && have_line_numbers == 0
       && pending_macros == NULL)
     {
-      /* Ignore symtabs that have no functions with real debugging
-         info.  */
+      /* Ignore symtabs that have no functions with real debugging info.  */
+      return NULL;
+    }
+  else
+    {
+      /* Define the STATIC_BLOCK.  */
+      return finish_block_internal (NULL, &file_symbols, NULL,
+				    last_source_start_addr, end_addr, objfile,
+				    0, expandable);
+    }
+}
+
+/* Implementation of the second part of end_symtab.  Pass STATIC_BLOCK
+   as value returned by end_symtab_get_static_block.
+
+   SECTION is the same as for end_symtab: the section number
+   (in objfile->section_offsets) of the blockvector and linetable.
+
+   If EXPANDABLE is non-zero the GLOBAL_BLOCK dictionary is made
+   expandable.  */
+
+struct symtab *
+end_symtab_from_static_block (struct block *static_block,
+			      struct objfile *objfile, int section,
+			      int expandable)
+{
+  struct symtab *symtab = NULL;
+  struct blockvector *blockvector;
+  struct subfile *subfile;
+  struct subfile *nextsub;
+
+  if (static_block == NULL)
+    {
+      /* Ignore symtabs that have no functions with real debugging info.  */
       blockvector = NULL;
     }
   else
     {
-      /* Define the STATIC_BLOCK & GLOBAL_BLOCK, and build the
+      CORE_ADDR end_addr = BLOCK_END (static_block);
+
+      /* Define after STATIC_BLOCK also GLOBAL_BLOCK, and build the
          blockvector.  */
-      finish_block_internal (0, &file_symbols, 0, last_source_start_addr,
-			     end_addr, objfile, 0, expandable);
-      finish_block_internal (0, &global_symbols, 0, last_source_start_addr,
-			     end_addr, objfile, 1, expandable);
+      finish_block_internal (NULL, &global_symbols, NULL,
+			     last_source_start_addr, end_addr, objfile,
+			     1, expandable);
       blockvector = make_blockvector (objfile);
     }
 
@@ -1251,21 +1270,46 @@
   return symtab;
 }
 
-/* See end_symtab_1 for details.  */
+/* Finish the symbol definitions for one main source file, close off
+   all the lexical contexts for that file (creating struct block's for
+   them), then make the struct symtab for that file and put it in the
+   list of all such.
+
+   END_ADDR is the address of the end of the file's text.  SECTION is
+   the section number (in objfile->section_offsets) of the blockvector
+   and linetable.
+
+   Note that it is possible for end_symtab() to return NULL.  In
+   particular, for the DWARF case at least, it will return NULL when
+   it finds a compilation unit that has exactly one DIE, a
+   TAG_compile_unit DIE.  This can happen when we link in an object
+   file that was compiled from an empty source file.  Returning NULL
+   is probably not the correct thing to do, because then gdb will
+   never know about this empty file (FIXME).
+
+   If you need to modify STATIC_BLOCK before it is finalized you should
+   call end_symtab_get_static_block and end_symtab_from_static_block
+   yourself.  */
 
 struct symtab *
 end_symtab (CORE_ADDR end_addr, struct objfile *objfile, int section)
 {
-  return end_symtab_1 (end_addr, objfile, section, 0);
+  struct block *static_block;
+
+  static_block = end_symtab_get_static_block (end_addr, objfile, 0);
+  return end_symtab_from_static_block (static_block, objfile, section, 0);
 }
 
-/* See end_symtab_1 for details.  */
+/* Same as end_symtab except create a symtab that can be later added to.  */
 
 struct symtab *
 end_expandable_symtab (CORE_ADDR end_addr, struct objfile *objfile,
 		       int section)
 {
-  return end_symtab_1 (end_addr, objfile, section, 1);
+  struct block *static_block;
+
+  static_block = end_symtab_get_static_block (end_addr, objfile, 1);
+  return end_symtab_from_static_block (static_block, objfile, section, 1);
 }
 
 /* Subroutine of augment_type_symtab to simplify it.
--- src/gdb/buildsym.h	2012/07/10 20:20:15	1.33
+++ src/gdb/buildsym.h	2012/07/13 20:26:10	1.34
@@ -258,6 +258,15 @@
 
 extern char *pop_subfile (void);
 
+extern struct block *end_symtab_get_static_block (CORE_ADDR end_addr,
+						  struct objfile *objfile,
+						  int expandable);
+
+extern struct symtab *end_symtab_from_static_block (struct block *static_block,
+						    struct objfile *objfile,
+						    int section,
+						    int expandable);
+
 extern struct symtab *end_symtab (CORE_ADDR end_addr,
 				  struct objfile *objfile, int section);
 
--- src/gdb/dwarf2read.c	2012/07/13 20:15:03	1.685
+++ src/gdb/dwarf2read.c	2012/07/13 20:26:10	1.686
@@ -6593,6 +6593,7 @@
   struct symtab *symtab;
   struct cleanup *back_to, *delayed_list_cleanup;
   CORE_ADDR baseaddr;
+  struct block *static_block;
 
   baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
 
@@ -6623,7 +6624,17 @@
      it, by scanning the DIE's below the compilation unit.  */
   get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
 
-  symtab = end_symtab (highpc + baseaddr, objfile, SECT_OFF_TEXT (objfile));
+  static_block = end_symtab_get_static_block (highpc + baseaddr, objfile, 0);
+
+  /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
+     Also, DW_AT_ranges may record ranges not belonging to any child DIEs
+     (such as virtual method tables).  Record the ranges in STATIC_BLOCK's
+     addrmap to help ensure it has an accurate map of pc values belonging to
+     this comp unit.  */
+  dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
+
+  symtab = end_symtab_from_static_block (static_block, objfile,
+					 SECT_OFF_TEXT (objfile), 0);
 
   if (symtab != NULL)
     {
--- src/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.S
+++ src/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.S	2012-07-13 20:26:31.658295000 +0000
@@ -0,0 +1,108 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2004, 2007-2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+	.text
+.Lbegin_text1:
+
+	.globl main
+	.type main, %function
+main:
+.Lbegin_main:
+	.int 0
+.Lend_main:
+	.size main, .-main
+
+	.globl func2
+	.type func2, %function
+func2:
+	.int 0
+	.size func2, .-func2
+
+.Lend_text1:
+
+/* Debug information */
+
+	.section .debug_info
+.Lcu1_begin:
+	/* CU header */
+	.4byte	.Lcu1_end - .Lcu1_start		/* Length of Compilation Unit */
+.Lcu1_start:
+	.2byte	2				/* DWARF Version */
+	.4byte	.Labbrev1_begin			/* Offset into abbrev section */
+	.byte	4				/* Pointer size */
+
+	/* CU die */
+	.uleb128 1				/* Abbrev: DW_TAG_compile_unit */
+	.4byte	.Lend_text1			/* DW_AT_high_pc */
+	.4byte	.Lbegin_text1			/* DW_AT_low_pc */
+	.ascii	"file1.txt\0"			/* DW_AT_name */
+	.ascii	"GNU C 3.3.3\0"			/* DW_AT_producer */
+	.byte	1				/* DW_AT_language (C) */
+
+	/* main */
+	.uleb128	2			/* Abbrev: DW_TAG_subprogram */
+	.byte		1			/* DW_AT_external */
+	.ascii		"main\0"		/* DW_AT_name */
+	.4byte	.Ldebug_ranges			/* DW_AT_ranges */
+
+	.byte		0			/* End of children of CU */
+.Lcu1_end:
+
+/* DW_AT_ranges.  */
+	.section	.debug_ranges
+.Ldebug_ranges:
+	.4byte	.Lbegin_main
+	.4byte	.Lend_main - 1
+	/* Make it slightly more interesting to set pending_addrmap_interesting.  */
+	.4byte	.Lend_main - 1
+	.4byte	.Lend_main
+	.4byte	0
+	.4byte	0
+
+/* Abbrev table */
+	.section .debug_abbrev
+.Labbrev1_begin:
+	.uleb128	1			/* Abbrev code */
+	.uleb128	0x11			/* DW_TAG_compile_unit */
+	.byte		1			/* has_children */
+	.uleb128	0x12			/* DW_AT_high_pc */
+	.uleb128	0x1			/* DW_FORM_addr */
+	.uleb128	0x11			/* DW_AT_low_pc */
+	.uleb128	0x1			/* DW_FORM_addr */
+	.uleb128	0x3			/* DW_AT_name */
+	.uleb128	0x8			/* DW_FORM_string */
+	.uleb128	0x25			/* DW_AT_producer */
+	.uleb128	0x8			/* DW_FORM_string */
+	.uleb128	0x13			/* DW_AT_language */
+	.uleb128	0xb			/* DW_FORM_data1 */
+	.byte		0x0			/* Terminator */
+	.byte		0x0			/* Terminator */
+
+	.uleb128	2			/* Abbrev code */
+	.uleb128	0x2e			/* DW_TAG_subprogram */
+	.byte		0			/* has_children */
+	.uleb128	0x3f			/* DW_AT_external */
+	.uleb128	0xc			/* DW_FORM_flag */
+	.uleb128	0x3			/* DW_AT_name */
+	.uleb128	0x8			/* DW_FORM_string */
+	.uleb128	0x55			/* DW_AT_ranges */
+	.uleb128	0x6			/* DW_FORM_data4 */
+	.byte		0x0			/* Terminator */
+	.byte		0x0			/* Terminator */
+
+	.byte		0x0			/* Terminator */
+	.byte		0x0			/* Terminator */
--- src/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.exp
+++ src/gdb/testsuite/gdb.dwarf2/dw2-minsym-in-cu.exp	2012-07-13 20:26:32.216111000 +0000
@@ -0,0 +1,34 @@
+# Copyright 2004-2005, 2007-2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+load_lib dwarf.exp
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+if {![dwarf2_support]} {
+    return 0  
+}
+
+# This testfile has reproducibility only with cc-with-index.sh.
+
+set testfile "dw2-minsym-in-cu"
+set srcfile ${testfile}.S
+set executable ${testfile}
+
+if [prepare_for_testing ${testfile}.exp ${executable} ${srcfile}] {
+    return -1
+}
+
+# Ask for address which is still located in this CU but not described by
+# any DIE.
+gdb_test "info fun func2" {All functions matching regular expression "func2":}