Re: [Buildroot] [autobuild.buildroot.net] Your daily results for 2022-05-08

[Petr Vorel <petr.vorel@gmail.com>]

Hi Fabrice,

> Hi Petr,

> Le dim. 15 mai 2022 à 07:48, Petr Vorel <petr.vorel@gmail.com> a écrit :

> > Hi all,

> > > Autobuilder failures
> > > ====================

> > >     arch     |             reason             |                                       url
> > > -------------+--------------------------------+---------------------------------------------------------------------------------
> > >    mips64    |     ltp-testsuite-20220121     | http://autobuild.buildroot.net/results/2dafec94b888960335115b44c281741dfd55840b

> > this uclibc 1.0.40  based toolchain is not able to detect fstatat() via configure, but
> > it's available:

> > configure:6615: checking for fstatat
> > configure:6615: buildroot/output/host/bin/mips64-buildroot-linux-uclibc-gcc -o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -Os -g0 -Ibuildroot/output/host/bin/../mips64-buildroot-linux-uclibc/sysroot/usr/include/tirpc  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE  conftest.c -Lbuildroot/output/host/bin/../mips64-buildroot-linux-uclibc/sysroot/usr/lib -ltirpc  -lfts >&5
> > buildroot/output/host/lib/gcc/mips64-buildroot-linux-uclibc/10.3.0/../../../../mips64-buildroot-linux-uclibc/bin/ld: /tmp/ccFw53nU.o: in function `main':
> > conftest.c:(.text.startup+0x10): undefined reference to `fstatat'
> > buildroot/output/host/lib/gcc/mips64-buildroot-linux-uclibc/10.3.0/../../../../mips64-buildroot-linux-uclibc/bin/ld: conftest.c:(.text.startup+0x18): undefined reference to `fstatat'

> > But even if I change include/config.h to
> > - /* #undef HAVE_FSTATAT */
> > +#define HAVE_FSTATAT 1

> > it fails to build:
> > output/build/ltp-testsuite-20220121/testcases/kernel/syscalls/fstatat/fstatat01.c:100: undefined reference to `fstatat'

> > That's strange, isn't it a bug in the toolchain?

> > Or is it really LTP bug? What would be missing then? If yes, it'd be nice to fix
> > it before upcoming LTP release (2 weeks).

> I dig into this issue a while ago without finding a solution. Here is
> what I found.
> First the build failure is only raised with uclibc-ng on mips64.
> Secondly, fstatat is defined as extern if __USE_FILE_OFFSET64 is not
> defined [1] however its implementation is protected by "ifdef
> __NR_fstatat64" [2]

> __NR_fstatat64 is defined by:

> #if __WORDSIZE == 64 && defined __NR_newfstatat
> # define __NR_fstatat64 __NR_newfstatat
> #endif

> So, for an unknown reason, I assume that __NR_newfstatat is not defined.
> In this case, uclibc-ng doesn't define any fallback [3] resulting in
> the build failure.

Thanks for confirming that it's bug/issue on uclibc-ng on mips64.
It'd be worth to at least report it to them.

Kind regards,
Petr


> > Kind regards,
> > Petr

> Best Regards,

> Fabrice

> [1] https://github.com/wbx-github/uclibc-ng/blob/ab1dd83bec59c9e65c31efd6e887182948f627be/include/sys/stat.h#L241
> [2] https://github.com/wbx-github/uclibc-ng/blob/ab1dd83bec59c9e65c31efd6e887182948f627be/libc/sysdeps/linux/common/fstatat.c#L18
> [3] https://github.com/wbx-github/uclibc-ng/blob/ab1dd83bec59c9e65c31efd6e887182948f627be/libc/sysdeps/linux/common/fstatat.c#L34
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