[Qemu-devel] QEMU build error on MIPS

[Qemu-devel] QEMU build error on MIPS

[Sunil Amitkumar Janki]

I am running Slackware Current on MIPS (Loongson) and am trying
to compile QEMU with GCC 3.4.6 using Glibc 2.5 and 2.6.18.1 kernel
headers. The build works fine except for warnings about linking PIC
code with no-PIC code but I get this error message when building Alpha
user emulation:

> make[1]: Entering directory `/tmp/qemu-20070531/alpha-linux-user'
> gcc -O2 -march=r4600 -Wall -O2 -g -fno-strict-aliasing -I. -I.. 
> -I/tmp/qemu-20070531/target-alpha -I/tmp/qemu-20070531 
> -I/tmp/qemu-20070531/linux-user -I/tmp/qemu-20070531/linux-user/alpha 
> -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE 
> -I/tmp/qemu-20070531/fpu -I/tmp/qemu-20070531/slirp    -c -o main.o 
> /tmp/qemu-20070531/linux-user/main.c
> gcc -O2 -march=r4600 -Wall -O2 -g -fno-strict-aliasing -I. -I.. 
> -I/tmp/qemu-20070531/target-alpha -I/tmp/qemu-20070531 
> -I/tmp/qemu-20070531/linux-user -I/tmp/qemu-20070531/linux-user/alpha 
> -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE 
> -I/tmp/qemu-20070531/fpu -I/tmp/qemu-20070531/slirp    -c -o syscall.o 
> /tmp/qemu-20070531/linux-user/syscall.c
> In file included from /tmp/qemu-20070531/linux-user/syscall_defs.h:850,
>                  from /tmp/qemu-20070531/linux-user/qemu.h:8,
>                  from /tmp/qemu-20070531/linux-user/syscall.c:72:
> /tmp/qemu-20070531/linux-user/alpha/termbits.h:2: error: conflicting 
> types for 'speed_t'
> /usr/include/asm/termbits.h:17: error: previous declaration of 
> 'speed_t' was here
> /tmp/qemu-20070531/linux-user/alpha/termbits.h:3: error: conflicting 
> types for 'tcflag_t'
> /usr/include/asm/termbits.h:18: error: previous declaration of 
> 'tcflag_t' was here
> /tmp/qemu-20070531/linux-user/syscall.c: In function 
> `target_to_host_cmsg':
> /tmp/qemu-20070531/linux-user/syscall.c:438: warning: cast to pointer 
> from integer of different size
> /tmp/qemu-20070531/linux-user/syscall.c: In function 
> `host_to_target_cmsg':
> /tmp/qemu-20070531/linux-user/syscall.c:483: warning: cast to pointer 
> from integer of different size
> /tmp/qemu-20070531/linux-user/syscall.c:3314:2: warning: #warning not 
> supported
> /tmp/qemu-20070531/linux-user/syscall.c: At top level:
> /tmp/qemu-20070531/linux-user/syscall.c:957: warning: 'do_socketcall' 
> defined but not used
> /tmp/qemu-20070531/linux-user/syscall.c:1135: warning: 'do_ipc' 
> defined but not used

Since I am one of the people requesting Alpha user/system emulation I 
wouldn't mind
helping to maintain Alpha user emulation and maybe even contribute to 
Alpha system
emulation. The only thing is that I am very new to QEMU and still don't 
understand
all of its internals. But I'm willing to learn by trial and error and 
some RTFMing.

To that end I have over the last few weeks read through the Alpha 
documentation
that I was pointed to by Wikipedia. I am also dabbling with MIPS on the 
Lemote Fu
Long box and reading through HPPA documentation so I hope that this will 
enable
me to much better understand the various RISC architectures and how to 
implement
them in QEMU.

Sunil Janki

Re: [Qemu-devel] QEMU build error on MIPS

[Thiemo Seufer]

Sunil Amitkumar Janki wrote:
> I am running Slackware Current on MIPS (Loongson) and am trying
> to compile QEMU with GCC 3.4.6 using Glibc 2.5 and 2.6.18.1 kernel
> headers. The build works fine except for warnings about linking PIC
> code with no-PIC code

Those warnings are expected, as the op.o needs to be built
as non-PIC code while the rest of qemu is (currently) PIC code.

Note that host support for MIPS is very lightly tested, so the
problems you see aren't all that surprising. There are many things
left which need improvement.


Thiemo