Re: [PATCH][RE-SUBMIT] Default setting of the ARM_UNWIND option

[Claudio Scordino]

Hi,

   I modified the patch according to your suggestions.

> You can just send it to Russell's patch system once there are no more
> comments on it.

Done. I'm attaching the latest version here too.

Many thanks,

           Claudio
From: Claudio Scordino <claudio@xxxxxxxxxxxxxxx>
Date: Fri, 30 Oct 2009 11:46:00 +0100
Subject: [PATCH 1/1] ARM unwind is known to compile only with EABI and not-buggy compilers.

ARM unwind is known to compile only with EABI and not-buggy compilers.
The problem is not the unwinding information but the -fno-frame-pointer option added as a result of !CONFIG_FRAME_POINTER.
Now we check the compiler and raise a #warning in case of wrong compiler.


Signed-off-by: Claudio Scordino <claudio@xxxxxxxxxxxxxxx>
---
 arch/arm/kernel/unwind.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 39baf11..786ac2b 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -26,6 +26,15 @@
  * http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html
  */
 
+#if !defined (__ARM_EABI__)
+#warning Your compiler does not have EABI support.
+#warning    ARM unwind is known to compile only with EABI compilers.
+#warning    Change compiler or disable ARM_UNWIND option.
+#elif (__GNUC__ == 4 && __GNUC_MINOR__ <= 2)
+#warning Your compiler is too buggy; it is known to not compile ARM unwind support.
+#warning    Change compiler or disable ARM_UNWIND option.
+#endif
+
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
-- 
1.6.0.4