Re: Compiling 2.4.1: undefined reference to `__buggy_fxsr_alignment'

Brian Gerst (
Wed, 31 Jan 2001 17:16:44 -0500

Matt Yourst wrote:
> Hi,
> I just tried to compile 2.4.1 and I'm getting the error "undefined
> reference to `__buggy_fxsr_alignment'" when trying to do the final
> link. It looks like this check was something 2.4.1 added to
> include/asm-i386/bugs.h to fail the kernel build if part of the thread
> structure wasn't aligned on a 16-byte boundary (which seems to make
> sense given FXSR's alignment requirements.) When was this check added?
> I assumed it was a bug in 2.4.0 that was just recently discovered, but
> I didn't see anything in the ChangeLog to that effect.
> The problem is that I don't know how to fix it (at least not reliably
> and cleanly.) I tried rearranging the fields in the task structure,
> but the alignment still wasn't right. I did apply a few non-standard
> patches that expanded the task structure, but the additional fields
> came well after the task's struct thread (which was causing the
> alignment problem.) FYI, I'm compiling with pgcc 2.95.2 and linking
> with binutils/ld 2.10 (I've used both of these successfully for
> countless kernel compiles before this.)
> Anyone else had this problem?
> - Matt Yourst

What GCC version did you compile with?


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