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Hi, Rich, thanks for your feedback.
=0A=
I feel a bit confused about the first comment from you. What's your me= aning of "It doesn't make sense to build a glibc-targeting cross compiler then= use musl-gcc to try to repurpose it."? I think I'm following the guide f= rom musl user-manual. What's the problem with my operation?
I am bui= lding a cross-compile with a risc-v gcc and using musl-gcc to create execut= able for risc-v. I have created static-linked and dynamic-linked by this wa= y and seems it can work and run on qemu-riscv.

Following is what gcc tells me when I added "-v"

<= /div>
$ $ ./install/bin/musl-gcc -v hello.c 
...... 
 /opt/riscv64/libexec/gcc/riscv64-unknown-linux-gnu/= 10.1.0/collect2 -plugin /opt/riscv64/libexec/gcc/riscv64-unknown-linux-gnu/= 10.1.0/liblto_plugin.so -plugin-opt=3D/opt/riscv64/libexec/gcc/riscv64-unkn= own-linux-gnu/10.1.0/lto-wrapper -plugin-opt=3D-fresolution=3D/tmp/ccyYnEJ8= .res -plugin-opt=3D-pass-through=3D/opt/riscv64/lib/gcc/riscv64-unknown-lin= ux-gnu/10.1.0/libgcc.a -plugin-opt=3D-pass-through=3D/opt/riscv64/lib/gcc/r= iscv64-unknown-linux-gnu/10.1.0/libgcc_eh.a -plugin-opt=3D-pass-through=3D-= lc -plugin-opt=3D-pass-through=3D/opt/riscv64/lib/gcc/riscv64-unknown-linux= -gnu/10.1.0/libgcc.a -plugin-opt=3D-pass-through=3D/opt/riscv64/lib/gcc/ris= cv64-unknown-linux-gnu/10.1.0/libgcc_eh.a -dynamic-linker /home/u/ws/test-m= usl-shared/install/ld-musl-riscv64.so.1 -nostdlib /home/u/ws/test-musl-shar= ed/install/lib/Scrt1.o /home/u/ws/test-musl-shared/install/lib/crti.o /opt/= riscv64/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/crtbeginS.o -L/home/u/ws/t= est-musl-shared/install/lib -L /opt/riscv64/lib/gcc/riscv64-unknown-linux-g= nu/10.1.0/. /tmp/cc4bazH8.o /opt/riscv64/lib/gcc/riscv64-unknown-linux-gnu/= 10.1.0/libgcc.a /opt/riscv64/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/libgc= c_eh.a -lc /opt/riscv64/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/libgcc.a /= opt/riscv64/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/libgcc_eh.a /opt/riscv= 64/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/crtendS.o /home/u/ws/test-musl-= shared/install/lib/crtn.o

$ ./install/bin/musl-gcc -v -static hello= .c 
......
/opt/riscv64/libexec/gcc/ri= scv64-unknown-linux-gnu/10.1.0/collect2 -plugin /opt/riscv64/libexec/gcc/ri= scv64-unknown-linux-gnu/10.1.0/liblto_plugin.so -plugin-opt=3D/opt/riscv64/= libexec/gcc/riscv64-unknown-linux-gnu/10.1.0/lto-wrapper -plugin-opt=3D-fre= solution=3D/tmp/ccCghbot.res -plugin-opt=3D-pass-through=3D/opt/riscv64/lib= /gcc/riscv64-unknown-linux-gnu/10.1.0/libgcc.a -plugin-opt=3D-pass-through= =3D/opt/riscv64/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/libgcc_eh.a -plugi= n-opt=3D-pass-through=3D-lc -dynamic-linker /home/u/ws/test-musl-shared/ins= tall/ld-musl-riscv64.so.1 -nostdlib -static /home/u/ws/test-musl-shared/ins= tall/lib/Scrt1.o /home/u/ws/test-musl-shared/install/lib/crti.o /opt/riscv6= 4/lib/gcc/riscv64-unknown-linux-gnu/10.1.0/crtbeginS.o -L/home/u/ws/test-mu= sl-shared/install/lib -L /opt/riscv64/lib/gcc/riscv64-unknown-linux-gnu/10.= 1.0/. /tmp/ccLHqUru.o --start-group /opt/riscv64/lib/gcc/riscv64-unknown-li= nux-gnu/10.1.0/libgcc.a /opt/riscv64/lib/gcc/riscv64-unknown-linux-gnu/10.1= .0/libgcc_eh.a -lc --end-group /opt/riscv64/lib/gcc/riscv64-unknown-linux-g= nu/10.1.0/crtendS.o /home/u/ws/test-musl-shared/install/lib/crtn.o


Another question is, how you test and= debug musl, expecially the dynamic-linker on cross-arch, i.e, debug on x86= machine but for risc-v?  Do you use qemu?  I really want to hear= your suggestion. Thanks in adv.


=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
=0A=
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