gdb on macOS Sierra

gdb.md

#include <iostream>
using namespace std;  

int divint(int, int);  
int main() 
{ 
   int x = 5, y = 2; 
   cout << divint(x, y); 
   
   x =3; y = 0; 
   cout << divint(x, y); 
   
   return 0; 
}  

int divint(int a, int b) 
{ 
   return a / b; 
}   

$g++ -g crash.cc -o crash

Floating point exception (core dumped)

If you are getting this in gdb on OSX while trying to run a program:

Unable to find Mach task port for process-id 57573: (os/kern) failure (0x5).
 (please check gdb is codesigned - see taskgated(8))

1. Open Keychain Access
2. In menu, open Keychain Access > Certificate Assistant > Create a certificate
3. Give it a name (e.g. gdbc)

• Identity type: Self Signed Root
• Certificate type: Code Signing
• Check: let me override defaults

4. Continue until "specify a location for..."
5. Keychain = System
6. Close. Find certificate in System keychains.
7. Get Info
8. Expand Trust, set Code signing to always trust
9. killall taskgated
10. Enable root account:
11. Open System Preferences
12. Go to User & Groups > Unlock
13. Login Options > "Join" (next to Network Account Server)
14. Click "Open Directory Utility"
15. Go up to Edit > Enable Root User
16. codesign -fs gdbc /usr/local/bin/gdb -- asks for root password
17. Disable root account

gdb crashes with the information: During startup program terminated with signal SIG113, Real-time event 113.

Quit gdb

1. Using your text editor e.g. Sublime Text, save a file called “.gdbinit” [Exclude the quotation marks] in your user folder.
2. In the file add the following: “set startup-with-shell off” [Exclude the quotation marks]
3. Save the file
4. gdb should now workv