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}=0A=
Regarding the setup of gdb cross-debugging env, I find a = solution and summarize here just FYI. If you have more questions or better = idea please feel free let me know.

First compile m= usl=EF=BC=9A
```
$ CFLAGS=3D-g CROSS_COMPILE=3Dris= cv64-unknown-linux-gnu- ./configure --prefix=3D/home/u/ws/test-musl-shared/= install --exec-prefix=3D/home/u/ws/test-musl-shared/install
```
notice I use `CFLAGS=3D-g` to enable debug info, but not <= span style=3D"background-color: transparent;">`--enable-debug`, I just find= if I use `--ena= ble-debug` instead, when I install the musl, the folder bin would not be cr= eated. I'm testing with musl-1.2.1, not sue if it is a bug.

After installation is completed, enter install/lib folder and create a sym= bol link for libc.so, the command you can input is `ln -s ./libc.so ld= -musl-riscv64.so.1`. Use this link-name just match the interpreter path nam= e in executale we would create later. The purpose of what I do here is to u= se the install folder as sysroot for later gdb debugging. 
<= br>
Build a simple hello a.out
`./install/bin/musl-gcc = -g hello.c`

Check it's elf info and look at t= he interpreter info here.
```
$ riscv64-unknown-linux-g= nu-readelf -l a.out
......
  INTERP     =     0x00000000000001c8 0x00000000000101c8 0x00000000000101c8
                 0x00000= 0000000001a 0x000000000000001a  R      0x1
&n= bsp;     [Requesting program interpreter: /lib/ld-musl-riscv64.so= .1]
......
```

Now we ca= n launch gdb to do cross-debug:
Run gdb-server: `$ qemu-riscv64 -= L /home/u/ws/test-musl-shared/install -g 1234 ./a.out`
Run gdb-cl= ient and set sysroot as the install folder so gdb can load symbols from our= libc.so successfully.
``` 
$ riscv64-unknown= -linux-gnu-gdb a.out
GNU gdb (GDB) 9.1
......
Reading symbols from a.out...
(gdb) show sysroot
The c= urrent system root is "/opt/riscv64/sysroot".
(gdb) set= sysroot /home/u/ws/test-musl-shared/install
(gdb) target remote:= 1234
Remote debugging using :1234
Reading symbols from = /home/u/ws/test-musl-shared/install/lib/ld-musl-riscv64.so.1...
0= x0000004000850ae2 in _dlstart () from /home/u/ws/test-musl-shared/install/l= ib/ld-musl-riscv64.so.1
```

That's= all.


=0A=

=0A=
Best Regards

Wang Che= n
=0A=
 
Fr= om: Rich Felker
<= b>Date: 2020-12-08 00:46
CC: <= a href=3D"mailto:musl@lists.openwall.com">musl
Subject: Re: [musl] [QUESTION] how to gdb dynamic linker for musl?
On Mon, Dec 07, 2020 at 09:37:45PM +0800, Chen Wang wrote:=
=0A=
> Hello,
=0A=
> I confugure and make musl with following:
=0A=
>
=0A=
> CFLAGS=3D-g CROSS_COMPILE=3Driscv64-unknown-linux-gnu- ./configur= e --prefix=3D/home/u/ws/musl/install --exec-prefix=3D/home/u/ws/musl/instal= l --syslibdir=3D/home/u/ws/musl/install
=0A=
>
=0A=
> create the executable with: ./install/bin/musl-gcc -g test.c=0A=
 
=0A=
I can't say conclusively that you can't make this work, but you really=
=0A=
don't want to do it this way. musl-gcc is for repurposing the host gcc=
=0A=
on a glibc-based system for "trying out" musl and making min= imal
=0A=
programs. It doesn't make sense to build a glibc-targeting cross
= =0A=
compiler then use musl-gcc to try to repurpose it. Just build a proper=
=0A=
musl-targeting cross-compiler.
=0A=
 
=0A=
However this probably isn't your problem.
=0A=
 
=0A=
> Then I tried to debug:
=0A=
> $ qemu-riscv64 -g 1234 ./a.out
=0A=
> then launch gdb:
=0A=
> $ riscv64-unknown-linux-gnu-gdb a.out
=0A=
>
=0A=
> but after I tried to target remote, gdb oops and tell me:
= =0A=
> ```
=0A=
> gdb) target remote:1234
=0A=
> Remote debugging using :1234
=0A=
> warning: Unable to find dynamic linker breakpoint function.
= =0A=
> GDB will be unable to debug shared library initializers
=0A=
> and track explicitly loaded dynamic code.
=0A=
> 0x0000004000850ae2 in ?? ()
=0A=
> ```
=0A=
>
=0A=
> I tried to set sysroot but does NOT take effect:
=0A=
> ```
=0A=
> (gdb) set sysroot /home/u/ws/musl/install/
=0A=
> warning: Unable to find dynamic linker breakpoint function.
= =0A=
> GDB will be unable to debug shared library initializers
=0A=
> and track explicitly loaded dynamic code.
=0A=
> (gdb) set sysroot /home/u/ws/musl/install/lib
=0A=
> warning: Unable to find dynamic linker breakpoint function.
= =0A=
> GDB will be unable to debug shared library initializers
=0A=
> and track explicitly loaded dynamic code.
=0A=
> ```
=0A=
> I checked the a.out
=0A=
> ```
=0A=
> $ riscv64-unknown-linux-gnu-readelf -l a.out
=0A=
> ......
=0A=
>   INTERP        = ; 0x00000000000001c8 0x00000000000101c8 0x00000000000101c8
=0A=
>           =        0x000000000000002d 0x000000000000002d&= nbsp; R      0x1
=0A=
>       [Requesting program interpret= er: /home/u/ws/musl/install/ld-musl-riscv64.so.1]
=0A=
> ......
=0A=
> ```
=0A=
> And I can run with qemu directly: $ qemu-riscv64 ./a.out, this=0A=
> works, but why I can not debug with gdb? Who can help me out? Tha= nks
=0A=
> in adv.
=0A=
 
=0A=
I haven't used gdb remote with qemu so I'm not sure what to expect=0A=
here in terms of how it finds/loads the binary and dynamic linker=0A=
(does it do that over the remote interface or via the local fs?). If=0A=
you can enable more output from qemu or strace one or both of gdb and<= /div>=0A=
qemu it might help figure out what's going on.
=0A=
 
=0A=
Hopefully someone else who's use gdb this way can offer more useful=0A=
help.
=0A=
 
=0A=
Rich
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