How to build & run ARM gdb?

How to build & run ARM gdb?

[Robert Trask]

Hello,
I am doing remote ARM system development cross hosted on a Redhat FC4 machine.
For building gdb I do the following:

# ./configure --target=arm-none-eabi
# make

The
resulting gdb seems to work ok vis-a-vis connecting to the target via
the remote protocol but it has problems interpreting the debug info in
the executable thus:

(gdb) list  <symbol_name>
No line number known for <symbol_name>.

Apparently this gdb can't understand the elf file?

But, the gdb that came with the RH distribution, ( GNU gdb Red Hat Linux (6.3.0.0-1.21rh)  DOES understand the elf file and correctly finds the <symbol_name> in the appropriate source file.
Of course, since it was configured for "i386-redhat-linux-gnu" it has no hope of properly interacting with the remote ARM target.

I have tried all manner of different configurations (all accepted by config.sub). I get the same result.

What is happening here and how do I fix it?
I have tried this with gdb 6.7.1 and 6.8. I am using Redhat Fedore Core 4.

R.

Re: How to build & run ARM gdb?

[Daniel Jacobowitz]

On Tue, May 13, 2008 at 07:08:22PM -0700, Robert Trask wrote:
> The
> resulting gdb seems to work ok vis-a-vis connecting to the target via
> the remote protocol but it has problems interpreting the debug info in
> the executable thus:
> 
> (gdb) list  <symbol_name>
> No line number known for <symbol_name>.
> 
> Apparently this gdb can't understand the elf file?

What compiler was used?  Can you provide a test case?

-- 
Daniel Jacobowitz
CodeSourcery

Re: How to build & run ARM gdb?

[Robert Trask]

As a follow on, I rebuilt the native gdb from 6.8 sources thus:

# ./configure
# make
# make install

It correctly interprets the arm elf file debug information, i.e. it's able to find symbols in source files via the "list" command etc.
Why is the simple act of cross-targeting gdb destroying this capability?


R.

----- Original Message ----
From: Robert Trask <rt_trask@yahoo.com>
To: gdb@sources.redhat.com
Sent: Tuesday, May 13, 2008 7:08:22 PM
Subject: How to build & run ARM gdb?

Hello,
I am doing remote ARM system development cross hosted on a Redhat FC4 machine.
For building gdb I do the following:

# ./configure --target=arm-none-eabi
# make

The
resulting gdb seems to work ok vis-a-vis connecting to the target via
the remote protocol but it has problems interpreting the debug info in
the executable thus:

(gdb) list  <symbol_name>
No line number known for <symbol_name>.

Apparently this gdb can't understand the elf file?

But, the gdb that came with the RH distribution, ( GNU gdb Red Hat Linux (6.3.0.0-1.21rh)  DOES understand the elf file and correctly finds the <symbol_name> in the appropriate source file.
Of course, since it was configured for "i386-redhat-linux-gnu" it has no hope of properly interacting with the remote ARM target.

I have tried all manner of different configurations (all accepted by config.sub). I get the same result.

What is happening here and how do I fix it?
I have tried this with gdb 6.7.1 and 6.8. I am using Redhat Fedore Core 4.

R.

Re: How to build & run ARM gdb?

[Daniel Jacobowitz]

On Wed, May 14, 2008 at 07:38:57AM -0700, Robert Trask wrote:
> Why is the simple act of cross-targeting gdb destroying this capability?

Did you see my request for a test case?

I know that the arm-none-eabi GDB works fine; we use it every day.

-- 
Daniel Jacobowitz
CodeSourcery