ARM: 5776/1: Check compiler version and EABI support when adding ARM unwind support.
authorClaudio Scordino <claudio@evidence.eu.com>
Fri, 30 Oct 2009 11:06:05 +0000 (12:06 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Mon, 2 Nov 2009 16:59:45 +0000 (16:59 +0000)
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@evidence.eu.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/kernel/unwind.c

index 39baf11..786ac2b 100644 (file)
  * 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>