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I'm trying to compile glibc (as a secondary, not a system replacement) 2.6 on an x86_64, and trying to get it to produce 32-bit objects. When I give it a standard configure, it compiles fine, producing the usual 64-bit library objects. Some info: $ uname -a Linux localhost.localdomain 2.6.18-164.11.1.el5 #1 SMP Wed Jan 20 07:32:21 \ EST 2010 x86_64 x86_64 x86_64 GNU/Linux $ cat /etc/redhat-release CentOS release 5.4 (Final) Among other things, I've tried the following: Attempt 1: $ # [in build/glibc-2.6] $ ../../src/glibc-2.6/configure --prefix=$HOME/glibc32-2.6 \ --with-cpu=i386-pc-linux-gnu ... checking sysdep dirs... configure: error: The i386-pc-linux-gnu subspecies of x86_64 is not supported." Attempt 2: $ ../../src/glibc-2.6/configure --prefix=$HOME/glibc32-2.6 \ --host=i386-pc-linux-gnu ... $ make The configure succeeds, but make causes a stream of compilation errors which all look like this: nptl/sysdeps/i386/tls.h:65:3: error: #error "TLS support is required." In file included from include/tls.h:6, from sysdeps/unix/sysv/linux/i386/sysdep.h:30, from <stdin>:1: I get the same result if I add --with-tls, and/or --target=i386-pc-linux-gnu. [EDIT: It looks like I was confusing --target for --build. I tried adding --build=i386-pc-linux-gnu instead, and also for all of the other attempts where I tried --target. In all cases, I got exactly the same result as before.] Attempt 3: $ CFLAGS=-m32 \ ../../src/glibc-2.6/configure --prefix=$HOME/glibc32-2.6 \ --host=i386-pc-linux-gnu \ ... In file included from ./../in

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