Re: [tip:perf/urgent] perf tools, x86: Fix 32-bit compile on 64-bitsystem

From: H. Peter Anvin
Date: Thu Jul 21 2011 - 12:07:59 EST

On 07/21/2011 08:36 AM, tip-bot for David Ahern wrote:
> Commit-ID: 08a4a43fc407d780bdde36d98f89c0dbb2a6be6b
> Gitweb:
> Author: David Ahern <dsahern@xxxxxxxxx>
> AuthorDate: Mon, 11 Jul 2011 15:38:24 -0600
> Committer: Ingo Molnar <mingo@xxxxxxx>
> CommitDate: Thu, 21 Jul 2011 13:42:30 +0200
> perf tools, x86: Fix 32-bit compile on 64-bit system
> Builds for 32-bit perf binaries on a 64-bit host currently fail
> with this error:
> [...]
> bench/../../../arch/x86/lib/memcpy_64.S: Assembler messages:
> bench/../../../arch/x86/lib/memcpy_64.S:29: Error: bad register name `%rdi'
> bench/../../../arch/x86/lib/memcpy_64.S:34: Error: invalid instruction suffix for `movs'
> bench/../../../arch/x86/lib/memcpy_64.S:50: Error: bad register name `%rdi'
> bench/../../../arch/x86/lib/memcpy_64.S:61: Error: bad register name `%rdi'
> ...
> The problem is the detection of the host arch without considering passed in
> flags. This change fixes 32-bit builds via:
> make EXTRA_CFLAGS=-m32
> and 64-bit builds still reference the memcpy_64.S.

But this is the wrong way to build 32-bit code on 64-bit platforms.
make ARCH=i386 is the supported way.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

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