linux-kernel - [PATCH 4/5] LLVMLinux: Add support for clang to compiler.h and new compiler-clang.h

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Date:	Tue, 25 Feb 2014 17:08:42 -0800
From:	behanw@...verseincode.com
To:	mmarek@...e.cz, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, sparse@...isli.org
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sparse@...r.kernel.org, torvalds@...ux-foundation.org,
	dwmw2@...radead.org, pageexec@...email.hu,
	Mark Charlebois <charlebm@...il.com>,
	Behan Webster <behanw@...verseincode.com>
Subject: [PATCH 4/5] LLVMLinux: Add support for clang to compiler.h and new compiler-clang.h

From: Mark Charlebois <charlebm@...il.com>

Add a compiler-clang.h file to add specific macros needed for compiling the
kernel with clang.

Initially the only override required is the macro for silencing the
compiler for a purposefully uninintialized variable.

Author: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Behan Webster <behanw@...verseincode.com>
---
 include/linux/compiler-clang.h | 12 ++++++++++++
 include/linux/compiler.h       |  7 +++++++
 2 files changed, 19 insertions(+)
 create mode 100644 include/linux/compiler-clang.h

diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
new file mode 100644
index 0000000..d1e49d5
--- /dev/null
+++ b/include/linux/compiler-clang.h
@@ -0,0 +1,12 @@
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
+#endif
+
+/* Some compiler specific definitions are overwritten here
+ * for Clang compiler
+ */
+
+#ifdef uninitialized_var
+#undef uninitialized_var
+#define uninitialized_var(x) x = *(&(x))
+#endif
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 2472740..ee7239e 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -63,6 +63,13 @@ extern void __chk_io_ptr(const volatile void __iomem *);
 # include <linux/compiler-intel.h>
 #endif
 
+/* Clang compiler defines __GNUC__. So we will overwrite implementations
+ * coming from above header files here
+ */
+#ifdef __clang__
+#include <linux/compiler-clang.h>
+#endif
+
 /*
  * Generic compiler-dependent macros required for kernel
  * build go below this comment. Actual compiler/compiler version
-- 
1.8.3.2

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