How to avoid "but contains no code." in command "info line"?

[qinwei<qinwei@sunnorth.com.cn>]

Dears, problems are here:

In a assembly file 'a.s', we define two sections which have code both.
For example:

line1: .section mysection
line2: load r4, [r3]
line3: jump func
......

line6: .text
line7: store r4, [r3]
line8: jump func
......

"info line a.s:7" will print both the begin and end address of the line.
but "info line a.s:2" just print the begin address and "but contains no 
code."

I trace the behavior of gdb (6.6 release) and find if the code is not in 
.text, 
then it will not be put to the 'blockvector structure' and finally the 
branch in
gdb/source.c is taken. Does gdb have commands to let codes that in user 
defined
sections tobe added to the 'blockvector structure' and "info line" will 
print 
both the begin & end address? Thanks!

      if (start_pc == end_pc) 
        { 
          printf_filtered ("Line %d of \"%s\"",
                   sal.line, sal.symtab->filename);
          wrap_here ("  "); 
          printf_filtered (" is at address ");
          print_address (start_pc, gdb_stdout);
          wrap_here ("  "); 
          printf_filtered (" but contains no code.\n");
        } 

Best regards,
Qinwei
Mail  qinwei@sunnorth.com.cn
Phone +86-010-62981668-2708
Fax   +86-010-62985972