gdb No symbol table is loaded

Question

I keep getting this error mesage when trying to add a breakpoint in gdb   I ve used these commands to compile   gcc -g main c utmpib2 c -o main o and  cc -g main c utmpib2 c -o main o and also  g   -g main c utmpib2 c -o main o   I also tried  -ggdb  instead of  -g  and I still get that error message   I then execute gdb    gdb   In gdb    gdb exec-file main o  gdb break 59 No symbol table is loaded  Use the  file  command

User · Accepted Answer

First of all  what you have is a fully compiled program  not an object file  so drop the  o extension  Now  pay attention to what the error message says  it tells you exactly how to fix your problem   No symbol table is loaded  Use the  file  command     gdb  exec-file test  gdb  b 2 No symbol table is loaded   Use the  file  command   gdb  file test Reading symbols from  home user test test   done   gdb  b 2 Breakpoint 1 at 0x80483ea  file test c  line 2   gdb     Or just pass the program on the command line     gdb test GNU gdb  GDB  7 4 Copyright  C  2012 Free Software Foundation  Inc  License GPLv3   GNU GPL version 3 or later  lt http   gnu org licenses gpl html gt        Reading symbols from  home user test test   done   gdb  b 2 Breakpoint 1 at 0x80483ea  file test c  line 2   gdb

User · Answer

Whenever gcc on the compilation machine and gdb  on the testing machine have differing versions  you may be facing debuginfo format incompatibility   To fix that  try downgrading the debuginfo format   gcc -gdwarf-3     gcc -gdwarf-2     gcc -gstabs     gcc -gstabs      gcc -gcoff     gcc -gxcoff     gcc -gxcoff        Or match gdb to the gcc you re using

User · Answer

I met this issue this morning because I used the same executable in DIFFERENT OSes  after compiling my program with gcc -ggdb -Wall test c -o test in my Mac 10 15 2   I ran gdb with the executable in Ubuntu 16 04  in my VirtualBox   Fix  recompile with the same command under Ubuntu  then you should be good

User · Answer

I have the same problem and I followed this Post  it solved my problem   Follow the following 2 steps    Make sure the optimization level is -O0 Add -ggdb flag when compiling your program   Good luck

User · Answer

You have to add extra parameter -g  which generates source level debug information  It will look like    gcc -g prog c   After that you can use gdb in common way

[c] gdb: "No symbol table is loaded"

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