[Buildroot] [PATCH 1/2 v2] xtensa: add support for the Xtensa architecture

[Chris Zankel]

Hi Thomas,

Sorry that you had to spend so much time on it. There are currently the
following restrictions:

Only linuxthreads/old and no-threads is supported for Xtensa. There
actually is a port for NPTL, and I'm trying to get it, but might take
some time. I will update the patch to disable NTPL on linuxthreads for
Xtensa for now.

uClibc 0.9.33 doesn't have the required Xtensa patches, so you would
have to select snapshot. I'm not sure what the best approach is here.
Provide a 'back-port' patch with these patches for 0.9.33 or only enable
'snapshot' for Xtensa. I'll update the two patches to only allow to
select snapshot for now.

Note that uClibc has added a new config and the current patch that is in
buildroot (uClibc.snapshot.linuxthreads-errno-fix.patch) doesn't apply
anymore. I noticed that a similar patch was dropped for 0.9.33.2, so I
was just also removing this patch for snapshot. I believe you created
that patch, so do you know if it can be removed? I can provide a patch
for buildroot to fix uClibc snapshot.

Thanks,
-Chris





On 11/09/2012 01:19 AM, Thomas Petazzoni wrote:
> Dear Chris Zankel,
>
> On Thu, 08 Nov 2012 22:33:28 -0800, Chris Zankel wrote:
>> The Xtensa architecture had been removed because it required special
>> handling and depended on additional directories and files that became
>> obsolete over time. This change is more aligned to other architectures.
>>
>> Signed-off-by: Chris Zankel <chris at zankel.net>
> Unfortunately, the default toolchain configuration for Xtensa doesn't.
> I.e, I tried to build the minimal configuration:
>
> BR2_xtensa=y
> BR2_PACKAGE_LUA=y
> BR2_PACKAGE_LUA_INTERPRETER=y
> BR2_PACKAGE_AVAHI=y
>
> And the build of gcc intermediate fails horribly with pthread errors:
>
> xtensa-buildroot-linux-uclibc/bin/ -B/home/test/outputs/xtensa/host/usr/xtensa-buildroot-linux-uclibc/lib/ -isystem /home/test/outputs/xtensa/host/usr/xtensa-buildroot-linux-u
> clibc/include -isystem /home/test/outputs/xtensa/host/usr/xtensa-buildroot-linux-uclibc/sys-include    -g -Os -O2  -g -Os -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wwrit
> e-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -
> fno-stack-protector   -I. -I. -I../.././gcc -I/home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc -I/home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/. -I/home/test/output
> s/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc -I/home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../include  -DHAVE_CC_TLS  -o _negdi2.o -MT _negdi2.o -MD -MP -MF _negdi2.dep
>  -DL_negdi2 -c /home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
>           -fvisibility=hidden -DHIDE_EXPORTS
> In file included from /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/stdio.h:72:0,
>                  from /home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc/tsystem.h:87,
>                  from /home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc/libgcc2.c:29:
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/bits/uClibc_stdio.h:274:2: error: unknown type name 'pthread_mutex_t'
> In file included from /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/bits/uClibc_mutex.h:15:0,
>                  from /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/bits/uClibc_stdio.h:107,
>                  from /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/stdio.h:72,
>                  from /home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc/tsystem.h:87,
>                  from /home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc/libgcc2.c:29:
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:227:28: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:228:7: error: unknown type name 'pthread_attr_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:244:26: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:249:32: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:257:34: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:265:28: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:269:1: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:272:27: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:272:48: error: unknown type name 'pthread_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:280:31: error: unknown type name 'pthread_attr_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:283:34: error: unknown type name 'pthread_attr_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:287:1: error: unknown type name 'pthread_attr_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:292:41: error: unknown type name 'pthread_attr_t'
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/pthread.h:298:1: error: unknown type name 'pthread_attr_t'
> [... many more ...]
> In file included from /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/stdio.h:72:0,
>                  from /home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc/tsystem.h:87,
>                  from /home/test/outputs/xtensa/toolchain/gcc-4.6.3/libgcc/../gcc/libgcc2.c:29:
> /home/test/outputs/xtensa/toolchain/uClibc_dev//usr/include/bits/uClibc_stdio.h:274:2: error: unknown type name 'pthread_mutex_t'
> make[3]: *** [_muldi3.o] Error 1
> make[3]: *** Waiting for unfinished jobs....
> make[3]: *** [_negdi2.o] Error 1
> make[2]: *** [all-target-libgcc] Error 2
> make[1]: *** [/home/test/outputs/xtensa/toolchain/gcc-4.6.3-intermediate/.compiled] Error 2
> make: *** [all] Error 2
>
> Is it that the pthread support for Xtensa is not available in uClibc?
>
> Best regards,
>
> Thomas