linux-kernel - Re: Current head x86_64 breakage

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Date:	Mon, 14 Jul 2008 18:11:23 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	LKML <linux-kernel@...r.kernel.org>, torvalds@...ux-foundation.org,
	Glauber Costa <gcosta@...hat.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: Current head x86_64 breakage - csum-copy_64.S

 >   AS      arch/x86/lib/csum-copy_64.o
 > arch/x86/lib/csum-copy_64.S: Assembler messages:
 > arch/x86/lib/csum-copy_64.S:48: Error: Macro `ignore' was already defined

Yes, the culprit seems to be 70f1bba4 ("x86: use ignore macro instead of
hash comment"), which introduces the ignore macro in dwarf2.h, which
collides with the macro already in csum-copy_64.S.

Perhaps something like the patch below?

---

[PATCH] x86: Rename "ignore" macro in <asm/dwarf2.h> to avoid collision

Commit 70f1bba4 ("x86: use ignore macro instead of hash comment") breaks
the 64-bit x86 build on toolchains that have CONFIG_AS_CFI undefined with:

    arch/x86/lib/csum-copy_64.S:48: Error: Macro `ignore' was already defined

because <asm/dwarf2.h> now uses the ignore macro name itself.  Fix this
by changing to __cfi_ignore in dwarf2.h.

Signed-off-by: Roland Dreier <rolandd@...co.com>
---

 include/asm-x86/dwarf2.h |   30 +++++++++++++++---------------
 1 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/asm-x86/dwarf2.h b/include/asm-x86/dwarf2.h
index 0bfe250..1a283d5 100644
--- a/include/asm-x86/dwarf2.h
+++ b/include/asm-x86/dwarf2.h
@@ -38,23 +38,23 @@
 
 /* Due to the structure of pre-exisiting code, don't use assembler line
    comment character # to ignore the arguments. Instead, use a dummy macro. */
-.macro ignore a=0, b=0, c=0, d=0
+.macro __cfi_ignore a=0, b=0, c=0, d=0
 .endm
 
-#define CFI_STARTPROC	ignore
-#define CFI_ENDPROC	ignore
-#define CFI_DEF_CFA	ignore
-#define CFI_DEF_CFA_REGISTER	ignore
-#define CFI_DEF_CFA_OFFSET	ignore
-#define CFI_ADJUST_CFA_OFFSET	ignore
-#define CFI_OFFSET	ignore
-#define CFI_REL_OFFSET	ignore
-#define CFI_REGISTER	ignore
-#define CFI_RESTORE	ignore
-#define CFI_REMEMBER_STATE ignore
-#define CFI_RESTORE_STATE ignore
-#define CFI_UNDEFINED ignore
-#define CFI_SIGNAL_FRAME ignore
+#define CFI_STARTPROC	__cfi_ignore
+#define CFI_ENDPROC	__cfi_ignore
+#define CFI_DEF_CFA	__cfi_ignore
+#define CFI_DEF_CFA_REGISTER	__cfi_ignore
+#define CFI_DEF_CFA_OFFSET	__cfi_ignore
+#define CFI_ADJUST_CFA_OFFSET	__cfi_ignore
+#define CFI_OFFSET	__cfi_ignore
+#define CFI_REL_OFFSET	__cfi_ignore
+#define CFI_REGISTER	__cfi_ignore
+#define CFI_RESTORE	__cfi_ignore
+#define CFI_REMEMBER_STATE __cfi_ignore
+#define CFI_RESTORE_STATE __cfi_ignore
+#define CFI_UNDEFINED __cfi_ignore
+#define CFI_SIGNAL_FRAME __cfi_ignore
 
 #endif
 
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