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LLVMLinux: Add support for clang to compiler.h and new compiler-clang.h

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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@gmail.com>
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
This commit is contained in:
Mark Charlebois 2012-11-20 22:13:10 +01:00 committed by Behan Webster
parent aa93685afb
commit 565cbdc2fe
2 changed files with 19 additions and 0 deletions
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12
include/linux/compiler-clang.h Normal file
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@ -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

7
include/linux/compiler.h
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@ -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