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

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Date:	Wed, 26 Nov 2008 12:13:44 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sam Ravnborg <sam@...nborg.org>
cc:	Paul Mundt <lethal@...ux-sh.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: Detecting endianness in scripts/recordmcount.pl?


On Wed, 26 Nov 2008, Sam Ravnborg wrote:

> 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.

Adding a parameter would be better.

-- Steve

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