Re: GDB with Eclipse *almost* working...

Bryan Evenson


-----Original Message-----
From: yocto-bounces@... [mailto:yocto-
bounces@...] On Behalf Of Bryan Evenson
Sent: Friday, September 25, 2015 12:17 PM
To: yocto@...
Subject: [yocto] GDB with Eclipse *almost* working...


I almost have a full working setup with GDB in Eclipse for debugging remotely
on my target hardware, but it's not quite there. Here's what I've done and
where I'm at so far:

1. I have a custom image that I build, plus a few userspace applications. I use
bitbake at the command line to build the full image. I have also built an SDK
based on my production image and have been successfully using that SDK to
build applications through Eclipse.
2. Followed the instructions for Eclipse as detailed in the "Working with
Eclipse" section of the manual to install all the remote debugging related
tools (GDB, TCF, etc.).
3. Created a dev image recipe that is the same as my base image recipe,
except I added dev-pkgs and eclipse-debug to IMAGE_FEATURES. For the
userspace applications I want to debug, I changed their reference in
IMAGE_INSTALL to list the "-dbg" packages instead of the standard packages.
I also added gdbserver to the IMAGE_INSTALL list.
4. Built my dev image and burned it to flash on my target hardware.
5. Upon starting my target hardware, I noticed that the executables and
other supporting files for the packages I listed as -dbg were missing. I then
by hand installed the standard packages (opkg install foo) to get all the files I
6. From Eclipse, I created a new Debug configuration as detailed in
"Deploying and Debugging the Application" section to setup for Remote
Application debugging using TCF.
7. I added a "set sysroot" line to the .gdbinit for my application to point to the
sysroot listed in the SDK I built in step 1.
8. I then launch debug and I am able to start the application on my target
hardware. However, none of the source files are viewable. I get the error
"No source available for main()" in the source window. I can run and pause
the application and see the disassembly, but I can't see the source and set

This is the closest I've ever got to debugging with GDB. Anyone know what
final step I may be missing?
The application I was trying to debug was not an Autotooled project. I have another application that is an Autotooled project; I tried debugging the second one and I could see the source code just fine. Eclipse had properly set the CFLAGS properly so I could do a debug build. For the straight Makefile project, I have to set a variable so it does a debug build. Once I set the environment variable for the Debug configuration so that it would actually use "-g -O0" in the CFLAGS the source files showed up and I can now set breakpoints. So if you aren't seeing the source file, make sure that your application is really doing a debug build.


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