linux-kernel - Re: [tip:x86/kbuild] x86: boot/compressed/vmlinux.lds.S: fix build of bzImage with 64 bit compiler

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Date:	Thu, 30 Apr 2009 19:52:59 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, tglx@...utronix.de, jdb@...x.dk,
	mingo@...e.hu, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/kbuild] x86: boot/compressed/vmlinux.lds.S: fix build of bzImage with 64 bit compiler

On Thu, Apr 30, 2009 at 09:29:25AM -0700, H. Peter Anvin wrote:
> Sam Ravnborg wrote:
> >>>
> >> I'm wondering if we should build the *.lds.S with -ansi or some other
> >> gcc option which disables ALL non-underscore macros.
> > 
> > I did not know that -ansi had this effect.
> > We are only seldomly hitting this issue and I wonder
> > if it could break something in out included headers.
> > Most likely not.
> > 
> 
> The other thing to recognize is probably that lds files aren't assembly,
> they're something else entirely.  Rather than reusing the *.S rules,
> having specific rules for them probably would make sense.

We already have that:
(scripts/Makfile.build)
# Linker scripts preprocessor (.lds.S -> .lds)
# ---------------------------------------------------------------------------
quiet_cmd_cpp_lds_S = LDS     $@
      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<

$(obj)/%.lds: $(src)/%.lds.S FORCE
        $(call if_changed_dep,cpp_lds_S)


So adding -ansi is trivial and will only hit .lds.S files.

I assume the lds files are named .S is because we shared rules
long time ago.

	Sam
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