Date: Sun, 30 Sep 2012 09:16:08 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: microblaze port committed On Sun, Sep 30, 2012 at 12:01:41AM -0700, Isaac Dunham wrote: > On Sat, 29 Sep 2012 01:41:57 -0400 > Rich Felker <dalias@...ifal.cx> wrote: > > > Hi all, > > > > I've committed the initial (and seemingly fully-working) version of > > the microblaze port. Several caveats: > > > > 1. Upstream binutils has a serious bug in gas whereby the relocations > > it generates for symbols with local weak definitions cannot be > > resolved by the linker. Patch at: > > http://permalink.gmane.org/gmane.linux.uclinux.microblaze/11155 > > > > 2. The toolchain binaries from Xilinx seem to produce .o files > > incompatible with standard binutils, and vice versa. Pick one or > > the other; don't mix them. > For Landley's sake, I'll mention what we discussed on IRC (+ some details): > - The Xilinx toolchain is binutils 2.16 + gcc 4.1.2 (GPLv2); > binutils support was merged upstream in 2009, so Aboriginal would > need the Xilinx EDK toolchain (see > http://git.xilinx.com/?p=mb_gnu.git;a=summary ofor source) It's also worth noting that their toolchain is somehow (gratuitously?) incompatible with objects from a standard toolchain, or at least the old binary one they released was. I haven't checked if the current source still has issues. > -Rich says that on microblaze, due to the way relocations are > handled, using -Bsymbolic instead of -Bsymbolic-functions gives a > libc.so that is either minimally broken or fully operational. (Mips > also works with -Bsymbolic.) For mips (32-bit with o32 abi), this is definitely true. For microblaze, I'm not sure. I would have to try compiling a test program that uses global vars from libc and see which type of relocations get used. > -The possibility of using mapfiles instead of -Bsymbolic-functions > was mentioned, but Rich doubts that they were supported in older > binutils. It's also incredibly ugly. I don't intend to make such a change upstream. Rich
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