[Barrelfish-users] Newlib libc ported

Zeus Gómez Marmolejo zeus.gomez at bsc.es
Mon Dec 19 19:23:30 CET 2011


I removed all GPL or LGPL code in the newlib and compiled again. All seems
to work as before... As it was said before, the inconv library and the
linux target was not used.


2011/12/19 "Vicenç Beltran (AC)" <vbeltran at ac.upc.edu>

>  Dear Mothy,
> newlib is  developed under set of BSD-like or public domain licenses. All
> the licenses used are in this link:
> http://sourceware.org/newlib/COPYING.NEWLIB
> There are a few files under the GPL or LGPL license but these files are
> used only on the *-linux targets and iconv library, which is optional.
> Anyway, we will double-check the license of all the files required to
> build the Newlib on Barrelfish.
> Regards,
>  - Vicenç
> On 19/12/2011 17:43, Timothy Roscoe wrote:
> Dear Zeus,
> This looks really useful - can you tell me what licence Newlib uses?
>  -- Mothy
> At Mon, 19 Dec 2011 17:06:24 +0100, Zeus Gómez Marmolejo <zeus.gomez at bsc.es> <zeus.gomez at bsc.es> wrote:
>  Dear Barrelfish developers,
> I would like to keep updated with our progress here at BSC. We have
> successfully ported the Redhat Newlib to Barrelfish as a libc replacement.
> To do so, some code in the posixcompat has been rewritten to not call in
> turn to the libc. This way, calls to write(), read() or sbrk() have been
> lightly modified to implement the functionality present in the existing
> libc. The objective has been to not touch the newlib.
> Right now, all programs link with newlib, being able to boot all system
> with this library. Also, in case the old library is needed, I've added a
> variable in the Config for Hake to be able to select which libc library to
> compile. Both of them are working. To do so, I had to separate includes
> that were system dependent and others that were libc dependent.
> This newlib has been included in the Barrelfish tree but can be used also
> with the independent gcc cross-compiler that we also developed here. This
> gives full C++ support with the GNU libstdc++ and exception support.
> Some technical details that I had to cope... Now all libraries (vfs,
> posixcompat, newlib, lwip, nfs...) are always linked in. Because newlib
> always needs posixcompat as it has the "system calls" implementation. Due
> to this, vfs, nfs and lwip have to be linked too as the implementation of
> read() write() have calls to vfs and nfs. In some executables, vfs is not
> needed but its linked in anyway. There was an issue with this, as
> vfs_init() was always called as it's present in the init section of the
> ELF. Some early executables in the boot process fail in the vfs_init() call
> as the ramfs is still not available. To solve this, we have placed the
> vfs_init() call at the start of the programs that use vfs, as most of them
> don't use it.
> If you wish I can send you the patch to be included in the tree...
> Kind regards,
> --
> Zeus Gómez Marmolejo
> Barcelona Supercomputing Center
> PhD studenthttp://www.bsc.es
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Zeus Gómez Marmolejo
Barcelona Supercomputing Center
PhD student
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