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Old 03-11-2007, 03:38 AM   #1
LQ Newbie
Registered: Mar 2007
Posts: 28

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Unhappy Trouble building a Cross Compiler to use to build a x86_64 kernel.

I'm attempting to build a Cross Compiler and keep running into problems; so if anyone can please help me it would be much appreciated. I'm using a Slackware 11.0 host system with a kernel with the default ARCH="i386" built by myself. I then downloaded 'binutils-2.17,' 'gcc-4.1.2' and 'glibc-2.5.' I then built binutils with the following sequence:

unset CFLAGS
../binutils/binutils-2.17/configure  --prefix=/usr/local/env64 --target=x86_64-sw-linux --with-lib-path=/usr/local/tmp/lib --enable-shared --enable-64-bit-bfd --disable-multilib
make install
This seemed to work fine. I should mention that /usr/local/tmp and it's subdirectory lib are empty. I then built gcc as so:

export PATH=$PATH:/usr/local/env64
export CFLAGS='-Dinhibit_libc'
../gcc/gcc-4.1.2/configure   --prefix=/usr/local/env64 --target=x86_64-sw-linux --with-local-prefix=/usr/local/tmp --disable-shared --disable-multilib --disable-threads --enable-languages=c
make all-gcc
make install-gcc
This also seemed to build without any real problems. Then I tried to build glibc like so:

mkdir /usr/local/env64/x86_64-sw-linux/include
cp -r /usr/src/linux/include/linux /usr/local/env64/x86_64-sw-linux/include
cp -r /usr/src/linux/include/asm-generic /usr/local/env64/x86_64-sw-linux/include
cp -r /usr/src/linux/include/asm-x86_64 /usr/local/env64/x86_64-sw-linux/include/asm
BUILD_CC="gcc" CC="x86_64-sw-linux-gcc -m64" AR="x86_64-sw-linux-ar" RANLIB="x86_64-sw-linux-ranlib" ../glibc/glibc-2.5/configure --prefix=/usr/local/env64 --host=x86_64-sw-linux --build=i686-pc-linux-gnu --disable-profile --enable-add-ons --with-tls --enable-kernel=2.6.0 --with-binutils=/usr/local/env64/bin --with-headers=/usr/local/env64/x86_64-sw-linux/include
This gives me the following error:

"configure: error: forced unwind support is required." I have no idea what to do now, so if anyone can please help I'd appreciate it.
Old 05-07-2007, 06:51 AM   #2
Registered: May 2007
Location: Austin, Texas, USA
Distribution: Debian Etch
Posts: 34

Rep: Reputation: 15
I'm stuck on this error also!

I've scoured the net trying to figure out how to overcome this. I'm trying to build a x86-64 -> i686 cross compiler. From what I can tell, the problem has something to do with a dependency on a libc. In other words, you need a libc to compile a libc!

Were you ever able to solve this problem?
Old 05-08-2007, 06:35 PM   #3
LQ Newbie
Registered: Mar 2007
Posts: 28

Original Poster
Rep: Reputation: 15
Sorry, no. I ended up installing Slamd64 in my case instead of using Slackware. Later on I decided to skip the headaches for now, and just go with Slackware. Slamd64 was nice but you really need a dual environment with 32 and 64 bits since there are some binaries which I cannot recompile because they are closed source. Such as video codecs. Basically I head to compile alot of stuff for both 32 and 64 bits, but that got tedious, so I decided to go with a strict 32 environment for now since everything is supported on that.


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