Reference to install and setup the gdb as the debugger for C++ development in OSX in Eclipse. Table of Contents: 01:06 - Install Homebrew 03:10 - Get dupes. HOWTO video for installing the GNU C, C++ and Fortran compilers on Mac OS 10.11 (El Capitan).
Watching changes We can step through the program and examine the values using the print command. The print command (abbreviated p) reveals that the value of fact never changes. Note that the function is returning a value of 0 for the function call ComputeFactorial(number=0). This is an ERROR! By taking a closer look at the values printed above, we realize that we are computing fact=fact * j where fact has been initialized to 0; fact should have been initialized to 1. We quit GDB with the quit command. Next we need to change the following line: Recompile the code and run it, you will get the expected output.
Debugging a program that produces a core dump
This program causes a core dump due to a segmentation fault. We will try to trace the reason for this core dump.
Download the program, from here.
1.Compile the program using the following command.
g++ testit.c –g –o testit
2.Run it normally, you should get the following result:
Segmentation fault (core dumped)
3.The core dump generates a file called corewhich can be used for debugging. Since, this program is really short, we will not need to set any breakpoints. Use the following command to start running the debugger to debug the core file produced by testit.
gdb testit core
The output of the above command should look like this:
bash$ gdb testit core
GNU gdb 19991004
Copyright 1998 Free Software ……….…
Core was generated by `testit'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libstdc++-libc6.1-1.so.2...done.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
#00x804851a in main () at testit.c:10
![Install Install](/uploads/1/2/5/8/125882705/405698055.jpg)
10temp[3]='F';
4.As we can see from the output above, the core dump was produced
as a result of execution of the statement on line 10: temp[3] =’F’;
Take a closer look at the declaration of temp on line 5 :
Line 5char *temp = 'Paras';
We find thattempis a char* which has been assigned a string literal, and so we cannot modify the contents of the literal as on line 10. This is what is causing a core dump
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