[Buildroot] [PATCH v2 1/6] toolchain/buildroot: allow uclibc-ng for riscv

[Damien Le Moal]

On 2020/10/09 4:33, Thomas Petazzoni wrote:
> Hello Damien,
> 
> On Tue, 6 Oct 2020 23:40:12 +0200
> Thomas Petazzoni <thomas.petazzoni at bootlin.com> wrote:
> 
>> And applied with some small improvements to the commit log as well.
> 
> So it turns out that the riscv32 uClibc-ng toolchain doesn't build. It
> fails in the uClibc-ng build with:
> 
> In file included from ./include/sys/procfs.h:34,
>                  from ./libpthread/nptl/../nptl_db/thread_db.h:28,
>                  from ./libpthread/nptl/descr.h:30,
>                  from ./libpthread/nptl/pthreadP.h:25,
>                  from <stdin>:2:
> ./include/sys/user.h:32:3: error: unknown type name '__uint128_t'
>    32 |   __uint128_t  vregs[32];
>       |   ^~~~~~~~~~~
> 
> You can see a more complete build log at:
> 
> https://gitlab.com/bootlin/toolchains-builder/-/jobs/776340188
> 
> The defconfig being built is just:
> 
> BR2_riscv=y
> BR2_RISCV_32=y
> BR2_KERNEL_HEADERS_5_4=y
> BR2_TOOLCHAIN_BUILDROOT_LOCALE=y
> BR2_PTHREAD_DEBUG=y
> BR2_BINUTILS_VERSION_2_34_X=y
> BR2_GCC_VERSION_10_X=y
> BR2_TOOLCHAIN_BUILDROOT_CXX=y
> BR2_TOOLCHAIN_BUILDROOT_FORTRAN=y
> BR2_INIT_NONE=y
> BR2_SYSTEM_BIN_SH_NONE=y
> # BR2_PACKAGE_BUSYBOX is not set
> BR2_PACKAGE_GDB=y
> # BR2_TARGET_ROOTFS_TAR is not set
> 
> Do you have some idea of what could be wrong here ?

No clue. This is very weird since this vregs thing is declared only in
libc/sysdeps/linux/aarch64/sys/user.h. So ARM64, not riscv.

The file libc/sysdeps/linux/riscv64/sys/user.h exists but does not use
__uint128_t, it is in fact empty. And this file does not exist for riscv32, the
entire libc/sysdeps/linux/riscv32 directory does not exist.

Something funky is going on with the arch dependent definitions...

Alistair,

Any idea ?


> 
> Thanks a lot,
> 
> Thomas
> 


-- 
Damien Le Moal
Western Digital Research