linux-kernel - Re: [PATCH] perf tools, x86: fix 32-bit compile on 64-bit system

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Date:	Fri, 15 Jul 2011 09:27:20 -0600
From:	David Ahern <dsahern@...il.com>
To:	mingo@...e.hu, fweisbec@...il.com
CC:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, peterz@...radead.org, paulus@...ba.org
Subject: Re: [PATCH] perf tools, x86: fix 32-bit compile on 64-bit system

On 07/11/2011 03:38 PM, David Ahern wrote:
> Builds for 32-bit binaries on a 64-bit host currently fail with the error:
> 
> gcc -o /tmp/perf-ppc/bench/mem-memcpy-x86-64-asm.o -c -fno-omit-frame-pointer -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Wformat-y2k -Wshadow -Winit-self -Wpacked -Wredundant-decls -Wstrict-aliasing=3 -Wswitch-default -Wswitch-enum -Wno-system-headers -Wundef -Wwrite-strings -Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wstrict-prototypes -Wdeclaration-after-statement -m32 -fstack-protector-all -Wstack-protector -Wvolatile-register-var -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Iutil/include -Iarch/x86/include -I/tmp/perf-ppc/ -DLIBELF_NO_MMAP -DDWARF_SUPPORT -DNO_NEWT_SUPPORT -DNO_LIBPERL -DNO_LIBPYTHON -DHAVE_CPLUS_DEMANGLE -DNO_STRLCPY -DARCH_X86_64 bench/mem-memcpy-x86-64-asm.S
> 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.
> 

Fairly trivial change to the Makefile. Any objections? I believe Arnaldo
is out for a few more days and realistically another week to get through
a month's backlog.

David

> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  tools/perf/Makefile |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> index 940257b..c168366 100644
> --- a/tools/perf/Makefile
> +++ b/tools/perf/Makefile
> @@ -52,7 +52,10 @@ ifeq ($(ARCH),i386)
>  endif
>  ifeq ($(ARCH),x86_64)
>  	ARCH := x86
> -	IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -xc - | tail -n 1)
> +	IS_X86_64 := 0
> +	ifeq (, $(findstring m32,$(EXTRA_CFLAGS)))
> +		IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -xc - | tail -n 1)
> +	endif
>  	ifeq (${IS_X86_64}, 1)
>  		RAW_ARCH := x86_64
>  		ARCH_CFLAGS := -DARCH_X86_64
--
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