linux-kernel - Re: Detecting endianness in scripts/recordmcount.pl?

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Message-ID: <20081126135441.GB28170@uranus.ravnborg.org>
Date:	Wed, 26 Nov 2008 14:54:41 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: Detecting endianness in scripts/recordmcount.pl?

On Wed, Nov 26, 2008 at 05:39:05PM +0900, Paul Mundt wrote:
> Presently there doesn't seem to be any way to determine whether the
> target is big or little endian, and it is assumed that the compiler will
> do the right thing by default. Unfortunately this can not be assumed,
> and mismatches ensue, resulting in the linker bailing out.
> 
> The only obvious solution I saw was to pass in KBUILD_CFLAGS and ld_flags
> along with $(CC) and $(LD) to the script, and killing off the hardcoded
> flags. This at least gets things building, but that still leaves objcopy
> and objdump as the odd ones out. On the other hand, the format can be figured
> out by objdumping the object and reading in the file format line, but people
> obviously do not have consistent naming for these, and a double-pass would
> be needed -- once for establishing little or big, followed by figuring out
> which set of regexes to use.
> 
> The CONFIG_64BIT test could likewise be adopted for testing endianness, but
> not all architectures have config options for endian selections.
But we could add this - no?
Much better than executing objdump one thousand times.

	Sam
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