2018 September 26 Cpp

How to setup gdb and Eclipse to debug C++ files on macOS Sierra

Ref: https://www.thomasvitale.com/how-to-setup-gdb-and-eclipse-to-debug-c-files-on-macos-sierra/

Install gdb

brew install gdb

gdb requires special privileges to access Mach ports. You will need to codesign the binary. For instructions, see:

https://sourceware.org/gdb/wiki/BuildingOnDarwin

On 10.12 (Sierra) or later with SIP, you need to run this: echo "set startup-with-shell off" >> ~/.gdbinit

$ gdb --version

GNU gdb (GDB) 8.2
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 

Generate a certificate

Launch Keychain Access application: Applications > Utilities > Keychain Access.
From the Keychains list on the left, right-click on the System item and select Unlock Keychain “System”.
Go to menu Keychain Access > Certificate Assistant > Create a Certificate.
Choose a name (e.g. gdb-cert).
Set Identity Type to Self Signed Root.
Set Certificate Type to Code Signing.
Check the Let me override defaults checkbox
Click on Create button.

Follow all steps, (Note: at last step, select system instead of default login)you can see the new certificate under System keychains. From the contextual menu of the newly created certificate (right-click on it) select the Get info option. In the dialogue box expand the Trust item and set Code signing to Always Trust.

Then, from the Keychains list on the left, right-click on the System item and select Lock Keychain “System”.

Reboot

Sign the certificate for gdb

$ codesign -s gdb-cert /usr/local/Cellar/gdb/8.2/bin/gdb

Potential issues

Unable to find Mach task port for process-id xxxx

// main.cpp
int
main() {
	int a = 1;
	int b = 2;
	int c = a + b;
	return c;
}

Compile

gcc -g -o main main.cpp

Test gdb

gdb main

GNU gdb (GDB) 8.2
...
Reading symbols from main...Reading symbols from /Users/y0w02p1/wy/codes/cpp/simplest/main.dSYM/Contents/Resources/DWARF/main...done.
done.

Try to run

(gdb) run

Encounter the following issue

Starting program: /Users/y0w02p1/wy/codes/cpp/simplest/main 
Unable to find Mach task port for process-id 1026: (os/kern) failure (0x5).
...

Solution

Ref: https://stackoverflow.com/questions/11504377/gdb-fails-with-unable-to-find-mach-task-port-for-process-id-error

sudo gdb main

To run gdb without sudo

Not Work !!!

Ref: https://stackoverflow.com/questions/10221448/emacs-24-and-gdb-6-3-on-mac-os-x/10441587#10441587

```bash sudo chgrp procmod /usr/local/Cellar/gdb/8.2/bin/gdb

sudo chmod g+s /usr/local/Cellar/gdb/8.2/bin/gdb ```

Set Eclipse for using gdb

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