commonlib: Clean up compiler.h

This patch contains several minor cleanups related to compiler.h:

- Replace __always_unused() (which is a Linux-specific concept that
  doesn't make sense without also having __maybe_unused(), and had zero
  uses in the codebase) with __unused() which moves here from helpers.h

- Add __underscores__ to the names of all attributes in the compiler
  attribute shorthand macros. This is necessary to make them work in
  files where the same name was already used for an identifier (e.g.
  cbfstool/cbfs.h's `unused` array of file types).

- Remove libpayload's own copy of compiler.h and make it directly pull
  in the commonlib/bsd copy.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I9644da594bb69133843c6b7f12ce50b2e45fd24b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64737
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

2 files changed, 9 insertions, 13 deletions

diff --git a/src/commonlib/bsd/include/commonlib/bsd/compiler.h b/src/commonlib/bsd/include/commonlib/bsd/compiler.h
index ebf017900d..42f9235e8e 100644
--- a/src/commonlib/bsd/include/commonlib/bsd/compiler.h
+++ b/src/commonlib/bsd/include/commonlib/bsd/compiler.h
@@ -5,34 +5,34 @@
 
 #ifndef __packed
 #if defined(__WIN32) || defined(__WIN64)
-#define __packed __attribute__((gcc_struct, packed))
+#define __packed __attribute__((__gcc_struct__, __packed__))
 #else
-#define __packed __attribute__((packed))
+#define __packed __attribute__((__packed__))
 #endif
 #endif
 
 #ifndef __aligned
-#define __aligned(x) __attribute__((aligned(x)))
+#define __aligned(x) __attribute__((__aligned__(x)))
 #endif
 
-#ifndef __always_unused
-#define __always_unused __attribute__((unused))
+#ifndef __unused
+#define __unused __attribute__((__unused__))
 #endif
 
 #ifndef __must_check
-#define __must_check __attribute__((warn_unused_result))
+#define __must_check __attribute__((__warn_unused_result__))
 #endif
 
 #ifndef __weak
-#define __weak __attribute__((weak))
+#define __weak __attribute__((__weak__))
 #endif
 
 #ifndef __noreturn
-#define __noreturn __attribute__((noreturn))
+#define __noreturn __attribute__((__noreturn__))
 #endif
 
 #ifndef __always_inline
-#define __always_inline inline __attribute__((always_inline))
+#define __always_inline inline __attribute__((__always_inline__))
 #endif
 
 #ifndef __fallthrough
diff --git a/src/commonlib/include/commonlib/helpers.h b/src/commonlib/include/commonlib/helpers.h
index b073e0e492..c294bee117 100644
--- a/src/commonlib/include/commonlib/helpers.h
+++ b/src/commonlib/include/commonlib/helpers.h
@@ -34,10 +34,6 @@
 	const __typeof__(((type *)0)->member) *__mptr = (ptr);	\
 	(type *)((char *)__mptr - offsetof(type, member)); })
 
-#ifndef __unused
-#define __unused __attribute__((unused))
-#endif
-
 #ifndef alloca
 #define alloca(x) __builtin_alloca(x)
 #endif