Fix sparse checks processing
A lot of errors are encountered when building with sparse checking
activated (make C=1 or make C=2).
Many of them are fixed in Linux.
Resynchronise Makefile and include/linux/build_bug.h with Linux
kernel sources by porting the following Linux commits into u-boot:
- 6c49f359ca14 ("kbuild: disable sparse warnings about unknown attributes")
- 80591e61a0f7 ("kbuild: tell sparse about the $ARCH")
- 8788994376d8 ("linux/build_bug.h: change type to int")
- 527edbc18a70 ("build_bug.h: remove most of dummy BUILD_BUG_ON stubs for Sparse")
- c60d3b79423a ("build_bug.h: remove negative-array fallback for BUILD_BUG_ON()")
- 14e83077d55f ("include: drop pointless __compiler_offsetof indirection")
Also revert commit aa9e891c63 ("include/linux/stddef.h: avoid
'warning: preprocessor token offsetof redefined'") because the
error it creates is worse than the warning it is trying to fix.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index a7f546f..c732eef 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -14,13 +14,7 @@
#include <linux/types.h>
#endif
-#ifndef __CHECKER__
#undef offsetof
-#ifdef __compiler_offsetof
-#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
-#else
-#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
-#endif
-#endif
+#define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
#endif