Re: eCos 3.0 beta 1 punch list #1

[Bart Veer <bartv@ecoscentric.com>]

>>>>> "Andrew" == Andrew Lunn <andrew.lunn@ascom.ch> writes:

    >> The synthetic target builds fine, but there is a run-time problem with
    >> cxxsupp. It appears that libgcc now assumes that glibc has done some
    >> initialization, setting up the %gs register to point at per-thread
    >> data. This came up previously in the context of the -fstack-protector
    >> flag, see the mailing list archives, but at the time we decided we
    >> could live with the problem. It looks like there are now more
    >> dependencies on getting this sorted - which I suspect will prove
    >> challenging.

    Andrew> What gcc and glibc are you using? For me cxxsupp runs and
    Andrew> passes. So as always, it seems to very from system to
    Andrew> system:

    Andrew> lunn@londo:~/eCos/work$ gcc -v
    Andrew> Using built-in specs.
    Andrew> Target: i486-linux-gnu
    Andrew> Configured with: ../src/configure -v --with-pkgversion='Debian 4.3.3-3' --with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-cld --with-tune=generic --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
    Andrew> Thread model: posix
    Andrew> gcc version 4.3.3 (Debian 4.3.3-3) 

    Andrew> $ /lib/libc.so.6
    Andrew> GNU C Library stable release version 2.7, by Roland McGrath et al.
    Andrew> Copyright (C) 2007 Free Software Foundation, Inc.
    Andrew> This is free software; see the source for copying conditions.
    Andrew> There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
    Andrew> PARTICULAR PURPOSE.
    Andrew> Compiled by GNU CC version 4.3.2.
    Andrew> Compiled on a Linux >>2.6.26.1<< system on 2009-01-04.

An up-to-date Fedora 10 system. gcc 4.3.2-7, libc 2.9.

However I am not sure that really matters. The writing is on the wall:
the synthetic target will need %gs support in the not too distant
future to remain fully functional on a range of Linux distributions.
I don't know when I'll have time to look into this.

Bart

-- 
Bart Veer                                   eCos Configuration Architect
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