as mentioned in PR, Linux kernel 4.9 fails to build with ASan due to wrong handling of emitted ODR indicator symbols. Although this might be a kernel bug (relying on specific pattern in symbol name sounds questionable), kernel doesn't need ODR indicators at all thus we can just disable them if -fsanitize=kernel-address is present.
Tested on x86_64-unknown-linux-gnu, OK for trunk?



2017-01-13  Maxim Ostapenko  <m.ostape...@samsung.com>

	PR sanitizer/78887
	* asan.c (asan_needs_odr_indicator_p): Don't emit ODR indicators
	if -fsanitize=kernel-address is present.

diff --git a/gcc/asan.c b/gcc/asan.c
index bc7ebc8..157d468 100644
--- a/gcc/asan.c
+++ b/gcc/asan.c
@@ -2360,7 +2360,8 @@ create_odr_indicator (tree decl, tree type)
 static bool
 asan_needs_odr_indicator_p (tree decl)
-  return !DECL_ARTIFICIAL (decl) && !DECL_WEAK (decl) && TREE_PUBLIC (decl);
+  return !(flag_sanitize & SANITIZE_KERNEL_ADDRESS) && !DECL_ARTIFICIAL (decl)
+	 && !DECL_WEAK (decl) && TREE_PUBLIC (decl);
 /* Append description of a single global DECL into vector V.

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