Re: __write alias missing on arm platforms

[Szabolcs Nagy <nsz@port70.net>]

* Szabolcs Nagy <nsz@port70.net> [2015-10-22 23:26:51 +0200]:
> * Sebastian Gottschall <s.gottschall@dd-wrt.com> [2015-10-22 23:18:54 +0200]:
> > Am 22.10.2015 um 22:55 schrieb Rich Felker:
> > >On Thu, Oct 22, 2015 at 10:21:54PM +0200, Sebastian Gottschall wrote:
> > >>musl is missing the __write function which seem to be a alias to "write".
> > >>this is required by libgcc on arm platforms. under some conditions
> > >>the compiler will generate code which does reference
> > >>this function then which leads to unresolved symbols
> > >>(seen on squid 4.0.1 on xscale)
> > >>
> > >>/home/xfs/toolchains/toolchain-armeb_xscale_gcc-5.2.0_musl-1.1.11/bin/../lib64/gcc/armeb-openwrt-linux-muslgnueabi/5.2.0/libgcc.a(linux-atomic-64bit.o):
> > >>In function `__check_for_sync8_kernelhelper':
> > >>/home/xfs/openwrt/trunk2/trunk/build_dir/toolchain-armeb_xscale_gcc-5.2.0_musl-1.1.11/gcc-5.2.0/libgcc/config/arm/linux-atomic-64bit.c:59:
> > >>undefined reference to `__write'
> > >>collect2: error: ld returned 1 exit status
> > >>l
> > >__write is not a public API even in glibc as far as I can tell. This
> > >looks like an abuse of an accidentally-public symbol by libgcc. For
> > >musl target anyway it should just be patched out of libgcc, e.g. with
> > >#ifdef.
> > you mean i have to send a bug report to GCC maintainers? i its part if the
> > libgcc sourcecode and is not provided by libgcc, but just referenced
> > i checked uclibc and glibc. both define __write as alias for write just
> > because of libgcc
> > 
> > so lets declare musl as broken on arm if gcc is used, if this is a solution
> > for you :-)
> > 
> 
> i will submit a bug report about this.
> 
> it should be fixed in gcc, __write is not

this patch should fix your problem:
https://gcc.gnu.org/ml/gcc-patches/2015-11/msg00456.html