Control: reassign -1 gcc-14

On Friday, January 16 2015, Mathieu Malaterre wrote:

Control: found -1 7.7.1+dfsg-5

Still present in jessie:

$ wget "https://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=d2.c;att=1;bug=730630"
$ gcc -o demo -g d2.c
$ gdb ./demo
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
Copyright (C) 2014 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-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./demo...done.
(gdb) b main
Breakpoint 1 at 0x4004d0: file d2.c, line 16.
(gdb) r
Starting program: /tmp/demo

Breakpoint 1, main (argc=1, argv=0x7fffffffe918) at d2.c:16
(gdb) list
Line number 16 out of range; d2.c has 11 lines.

GDB's output nowadays is better:

--8<---------------cut here---------------start------------->8---
(gdb) r
Starting program: /root/demo
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Breakpoint 1, main (argc=1, argv=0x7fffffffec28) at d2.c:16
(gdb) list
End of the file was already reached, use "list ." to list the current location again
--8<---------------cut here---------------end--------------->8---

Still, one can see that GDB thinks the breakpoint hit on line 16, which
is wrong. But GDB is only following what DWARF is telling it:

--8<---------------cut here---------------start------------->8---
<2><6a>: Abbrev Number: 5 (DW_TAG_variable)
<6b> DW_AT_name : v
<6d> DW_AT_decl_file : 1
<6e> DW_AT_decl_line : 16
<6f> DW_AT_decl_column : 7
<70> DW_AT_type : <0x78>
<74> DW_AT_location : 2 byte block: 91 6c (DW_OP_fbreg: -20) --8<---------------cut here---------------end--------------->8---

GCC is the one emitting bogus DW_AT_decl_line information here.
Therefore, I'm reassigning this bug to GCC.

Thanks,

--
Sergio
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