[Bug breakpoints/21358] New: Can't list or set breakpoints in current source file if it is a symlink

["jwakely.gcc at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21358

            Bug ID: 21358
           Summary: Can't list or set breakpoints in current source file
                    if it is a symlink
           Product: gdb
           Version: 7.11.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: jwakely.gcc at gmail dot com
  Target Milestone: ---

~$ cd /tmp
tmp$ cat > test.cc
#include <stdio.h>

void f()
{
  puts("printy printy printy");
} 

int main()
{
  f();
}
tmp$ ln -s test.cc link.cc
tmp$ g++ -g link.cc
tmp$ /home/jwakely/gcc/gdb/7.12.1/bin/gdb -nx -ex start -ex "br 5" a.out
GNU gdb (GDB) 7.12.1
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and "show warranty" for details.
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from a.out...done.
Temporary breakpoint 1 at 0x4005fb: file link.cc, line 10.
Starting program: /tmp/a.out 

Temporary breakpoint 1, main () at link.cc:10
10        f();
No line 5 in the current file.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) br 5
No line 5 in the current file.
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb) step
f () at link.cc:5
5         puts("printy printy printy");
(gdb) bt
#0  f () at link.cc:5
#1  0x0000000000400600 in main () at link.cc:10
(gdb) br
Breakpoint 2 at 0x4005ea: file link.cc, line 5.
(gdb) l 5
No line 5 in the current file.
(gdb) l link.cc:5
1       #include <stdio.h>
2
3       void f()
4       {
5         puts("printy printy printy");
6       }
7
8       int main()
9       {
10        f();
(gdb) l test.cc:5
No source file named test.cc.
(gdb) 


The backtrace shows the "correct" filename (i.e. the symlink) and setting a
breakpoint on the current line shows "file link.cc, line 5", and setting a
breakpoint at "link.cc:5" works. But "br 5" and "list 5" don't.



(gdb) maint info line-table
objfile: /tmp/a.out ((struct objfile *) 0x2606bb0)
compunit_symtab: ((struct compunit_symtab *) 0x2611c40)
symtab: /tmp/test.cc ((struct symtab *) 0x2611cc0)
linetable: ((struct linetable *) 0x265f140):
INDEX    LINE ADDRESS
0           4 0x00000000004005e6
1           5 0x00000000004005ea
2           6 0x00000000004005f4
3           9 0x00000000004005f7
4          10 0x00000000004005fb
5          11 0x0000000000400600
6           0 0x0000000000400607
objfile: /tmp/a.out ((struct objfile *) 0x2606bb0)
compunit_symtab: ((struct compunit_symtab *) 0x2611c40)
symtab: /usr/lib/gcc/x86_64-redhat-linux/6.3.1/include/stddef.h ((struct symtab
*) 0x2611d00)
linetable: ((struct linetable *) 0x0):
No line table.
objfile: /tmp/a.out ((struct objfile *) 0x2606bb0)
compunit_symtab: ((struct compunit_symtab *) 0x2611c40)
symtab: /usr/include/bits/types.h ((struct symtab *) 0x2611d40)
linetable: ((struct linetable *) 0x0):
No line table.
objfile: /tmp/a.out ((struct objfile *) 0x2606bb0)
compunit_symtab: ((struct compunit_symtab *) 0x2611c40)
symtab: /usr/include/libio.h ((struct symtab *) 0x2611d80)
linetable: ((struct linetable *) 0x0):
No line table.
objfile: /tmp/a.out ((struct objfile *) 0x2606bb0)
compunit_symtab: ((struct compunit_symtab *) 0x2611c40)
symtab: /usr/include/stdio.h ((struct symtab *) 0x2611dc0)
linetable: ((struct linetable *) 0x0):
No line table.
objfile: /tmp/a.out ((struct objfile *) 0x2606bb0)
compunit_symtab: ((struct compunit_symtab *) 0x2611c40)
symtab: /usr/include/bits/sys_errlist.h ((struct symtab *) 0x2611e00)
linetable: ((struct linetable *) 0x0):
No line table.

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