gdbserver - manually modify Makefile

gdbserver - manually modify Makefile

[Ran Shalit]

Hello,

I've  cross compile  gdbserver according to wiki in:
https://sourceware.org/gdb/wiki/BuildingCrossGDBandGDBserver
ubuntu@ubuntu-laptop:~/gdb-7.9.1/gdb/gdbserver$ sudo ./configure
--host=powerpc-buildroot-linux-gnu --disable-werror

But on doing :
make
I've noticed that it uses the host gcc instead of the cross-compiler gcc.
Only after manually modifying the Makefie with
CC = powerpc-buildroot-linux-gnu-gcc
instead of
CC = gcc
It was cross compiling as expected.

Can anyone help me understand what was wrong doing in the above steps?

Since this didn't work as expected I'm afraid that maybe the gdb as I
compiled might also required some manually modifications which I am
not aware of.
These are the steps for gdb build:
ubuntu@ubuntu-laptop:~/gdb-7.9.1/$ sudo ./configure
--target=powerpc-buildroot-linux-gnu --disable-werror

Thank you for your assistance,
Ran

Re: gdbserver - manually modify Makefile

[Orlando Arias]

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Greetings,

I believe this is happening because you need to supply a --target
parameter to gdbserver as well.

./configure --host=powerpc-buildroot-linux-gnu \
	--target=powerpc-buildroot-linux-gnu \
	--disable-werror

Cheers,
Orlando.

On 08/13/2015 04:50 PM, Ran Shalit wrote:
> Hello,
> 
> I've  cross compile  gdbserver according to wiki in:
> https://sourceware.org/gdb/wiki/BuildingCrossGDBandGDBserver
> ubuntu@ubuntu-laptop:~/gdb-7.9.1/gdb/gdbserver$ sudo ./configure
> --host=powerpc-buildroot-linux-gnu --disable-werror
> 
> But on doing :
> make
> I've noticed that it uses the host gcc instead of the cross-compiler gcc.
> Only after manually modifying the Makefie with
> CC = powerpc-buildroot-linux-gnu-gcc
> instead of
> CC = gcc
> It was cross compiling as expected.
> 
> Can anyone help me understand what was wrong doing in the above steps?
> 
> Since this didn't work as expected I'm afraid that maybe the gdb as I
> compiled might also required some manually modifications which I am
> not aware of.
> These are the steps for gdb build:
> ubuntu@ubuntu-laptop:~/gdb-7.9.1/$ sudo ./configure
> --target=powerpc-buildroot-linux-gnu --disable-werror
> 
> Thank you for your assistance,
> Ran
> 


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Re: gdbserver - manually modify Makefile

[Pedro Alves]

On 08/13/2015 09:50 PM, Ran Shalit wrote:
> Hello,
> 
> I've  cross compile  gdbserver according to wiki in:
> https://sourceware.org/gdb/wiki/BuildingCrossGDBandGDBserver
> ubuntu@ubuntu-laptop:~/gdb-7.9.1/gdb/gdbserver$ sudo ./configure
> --host=powerpc-buildroot-linux-gnu --disable-werror

You should not need sudo, nor --disable-werror.

> 
> But on doing :
> make
> I've noticed that it uses the host gcc instead of the cross-compiler gcc.
> Only after manually modifying the Makefie with
> CC = powerpc-buildroot-linux-gnu-gcc
> instead of
> CC = gcc
> It was cross compiling as expected.
> 

Open the config.log file in the build directory, and look for something
that looks like this:

configure:2558: checking for powerpc-buildroot-linux-gnu-gcc

The following lines should look something like this:

configure:2574: found /path/to/whatever/bin/powerpc-buildroot-linux-gnu-gcc
configure:2585: result: powerpc-buildroot-linux-gnu-gcc
configure:2854: checking for C compiler version
configure:2863: powerpc-buildroot-linux-gnu-gcc --version >&5

But in your case, "result" is probably "gcc".  If configure doesn't
find $host-gcc, then it'll default to "gcc".  Most likely, you don't
have powerpc-buildroot-linux-gnu-gcc in the PATH.  Make sure
it is in the PATH, and that you can execute it (e.g., try
$ powerpc-buildroot-linux-gnu-gcc -v), and start over.

Let me know how it went.

Thanks,
Pedro Alves

Re: gdbserver - manually modify Makefile

[Ran Shalit]

On Fri, Aug 14, 2015 at 12:58 AM, Pedro Alves <palves@redhat.com> wrote:
> On 08/13/2015 09:50 PM, Ran Shalit wrote:
>> Hello,
>>
>> I've  cross compile  gdbserver according to wiki in:
>> https://sourceware.org/gdb/wiki/BuildingCrossGDBandGDBserver
>> ubuntu@ubuntu-laptop:~/gdb-7.9.1/gdb/gdbserver$ sudo ./configure
>> --host=powerpc-buildroot-linux-gnu --disable-werror
>
> You should not need sudo, nor --disable-werror.
>
>>
>> But on doing :
>> make
>> I've noticed that it uses the host gcc instead of the cross-compiler gcc.
>> Only after manually modifying the Makefie with
>> CC = powerpc-buildroot-linux-gnu-gcc
>> instead of
>> CC = gcc
>> It was cross compiling as expected.
>>
>
> Open the config.log file in the build directory, and look for something
> that looks like this:
>
> configure:2558: checking for powerpc-buildroot-linux-gnu-gcc
>
> The following lines should look something like this:
>
> configure:2574: found /path/to/whatever/bin/powerpc-buildroot-linux-gnu-gcc
> configure:2585: result: powerpc-buildroot-linux-gnu-gcc
> configure:2854: checking for C compiler version
> configure:2863: powerpc-buildroot-linux-gnu-gcc --version >&5
>
> But in your case, "result" is probably "gcc".  If configure doesn't
> find $host-gcc, then it'll default to "gcc".  Most likely, you don't
> have powerpc-buildroot-linux-gnu-gcc in the PATH.  Make sure
> it is in the PATH, and that you can execute it (e.g., try
> $ powerpc-buildroot-linux-gnu-gcc -v), and start over.
>
> Let me know how it went.
>
> Thanks,
> Pedro Alves
>

Hi Pedro,

Thanks for the feedback.
You were correct about the PATH, that solved the issue !

But I still need the --disable-werror, otherwise it stops build on
warning (treated as error).

Regards,
Ran

Re: gdbserver - manually modify Makefile

[Pedro Alves]

On 08/13/2015 11:26 PM, Ran Shalit wrote:

> Thanks for the feedback.
> You were correct about the PATH, that solved the issue !

Great, thanks for closing the loop.

> 
> But I still need the --disable-werror, otherwise it stops build on
> warning (treated as error).

OK.  I had assumed from "gdb-7.9.1" that you were building a
release: -Werror is disabled in release tarballs.

Thanks,
Pedro Alves