Messages in this thread Patch in this message | | | From | behanw@converse ... | Subject | [PATCH 4/5] LLVMLinux: Add support for clang to compiler.h and new compiler-clang.h | Date | Tue, 25 Feb 2014 17:08:42 -0800 |
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From: Mark Charlebois <charlebm@gmail.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@gmail.com> Signed-off-by: Mark Charlebois <charlebm@gmail.com> Signed-off-by: Behan Webster <behanw@converseincode.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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