Bug 1028679

Summary:	gdb prints Python Exception <type 'exceptions.IndexError'> list index out of range
Product:	[Fedora] Fedora	Reporter:	alberth289346
Component:	gcc	Assignee:	Phil Muldoon <pmuldoon>
Status:	CLOSED EOL	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	19	CC:	alberth289346, gbenson, jakub, jan.kratochvil, law, palves, patrickm, pmuldoon, sergiodj
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-02-17 19:09:38 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description alberth289346 2013-11-09 13:22:08 UTC

Description of problem:
When running gdb, it speaks about a Python exception, even when debugging a C++ program.
See below. I replaced my home directory path with $HOME, and added the empty lines above the (gdb) prompt.

The Python Exception line is at the 5th line of the "r" command.

$ gdb freerct 
GNU gdb (GDB) Fedora 7.6.1-42.fc19
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from $HOME/freerct/coaster_cars/src/freerct...done.

(gdb) b track_piece.cpp:184
Breakpoint 1 at 0x4414b4: file $HOME/freerct/coaster_cars/src/track_piece.cpp, line 184.

(gdb) r
Starting program: $HOME/freerct/coaster_cars/src/freerct 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Python Exception <type 'exceptions.IndexError'> list index out of range: 
Breakpoint 1, TrackPiece::Load (this=0x704908, rcd_file=0x7fffffffdca0, length=119, 
    sprites=std::map with 2 elements) at $HOME/freerct/coaster_cars/src/track_piece.cpp:184
184             if (length < 2+3+1+2+4+2) return false;
Missing separate debuginfos, use: debuginfo-install SDL-1.2.15-11.fc19.x86_64 SDL_ttf-2.0.11-3.fc19.x86_64 freetype-2.4.11-7.fc19.x86_64

Comment 1 Jan Kratochvil 2013-11-09 17:58:46 UTC

I debug with f19 GDB daily and I do not see such problem, even for C++ code.
Could you provide a better reproducer?  Maybe your 'freerct' binary would be sufficient.

Comment 2 Jan Kratochvil 2013-11-10 09:28:37 UTC

(gdb) l 1
1	#include <set>
2	int main() {
3	  std::set<int> a,&b(a);
4	  return 0; /* line 4 */
5	}
(gdb) b 4
(gdb) r
4	  return 0; /* line 4 */
(gdb) p a
$1 = std::set with 0 elements
(gdb) p b
Python Exception <type 'exceptions.IndexError'> list index out of range: 
$2 = std::set with 0 elements

Comment 3 Tom Tromey 2013-11-11 15:56:21 UTC

Seems like:

http://sourceware.org/bugzilla/show_bug.cgi?id=15195

Fixed here:

2013-08-20  Phil Muldoon  <pmuldoon>

	PR libstdc++/53477
	http://sourceware.org/bugzilla/show_bug.cgi?id=15195

	* python/libstdcxx/v6/printers.py (Printer.__call__): If a value
	is a reference, fetch referenced value.
	(RxPrinter.invoke): Ditto.
	* testsuite/libstdc++-prettyprinters/cxx11.cc (main): Add -O0
	flag. Add referenced value tests.


Though I don't see std::set in the test case -- so it is possibly an
oversight, though the implementation approach makes me think it 
most likely really is fixed.

Comment 4 Jan Kratochvil 2013-11-11 16:52:56 UTC

Jakub,
/usr/share/gcc-*/python/libstdcxx/v6/printers.py
needs to be patched by
http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=201888
GIT commit df1ac917c9ce90beb8c3804c2d92cb47b337de30
The patch is applicable to F18/F19/F20/Rawhide.

Comment 5 Fedora End Of Life 2015-01-09 20:32:14 UTC

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Comment 6 Fedora End Of Life 2015-02-17 19:09:38 UTC

Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is
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