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

[Waldemar Brodkorb]

Hi,
Uclibc-Ng doesn’t support riscv32!
Best regards
 Waldemar 

> Am 12.10.2020 um 07:00 schrieb Damien Le Moal <damien.lemoal at wdc.com>:
> 
> 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
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