[PATCH] compiler_attributes.h: move __compiletime_{error|warning}

[Bart Van Assche <bvanassche@acm.org>]

From: Nick Desaulniers <ndesaulniers@google.com>

commit b83a908498d68fafca931e1276e145b339cac5fb upstream.

Clang 14 will add support for __attribute__((__error__(""))) and
__attribute__((__warning__(""))). To make use of these in
__compiletime_error and __compiletime_warning (as used by BUILD_BUG and
friends) for newer clang and detect/fallback for older versions of
clang, move these to compiler_attributes.h and guard them with
__has_attribute preprocessor guards.

Link: https://reviews.llvm.org/D106030
Link: https://bugs.llvm.org/show_bug.cgi?id=16428
Link: https://github.com/ClangBuiltLinux/linux/issues/1173
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
[Reworded, landed in Clang 14]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 include/linux/compiler-gcc.h        |  3 ---
 include/linux/compiler_attributes.h | 24 ++++++++++++++++++++++++
 include/linux/compiler_types.h      |  6 ------
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 4cf524ccab43..ae2de4e1cd6f 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -54,9 +54,6 @@
 
 #define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
 
-#define __compiletime_warning(message) __attribute__((__warning__(message)))
-#define __compiletime_error(message) __attribute__((__error__(message)))
-
 #if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
 #define __latent_entropy __attribute__((latent_entropy))
 #endif
diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
index b2a3f4f641a7..08eb06301791 100644
--- a/include/linux/compiler_attributes.h
+++ b/include/linux/compiler_attributes.h
@@ -30,6 +30,7 @@
 # define __GCC4_has_attribute___assume_aligned__      (__GNUC_MINOR__ >= 9)
 # define __GCC4_has_attribute___copy__                0
 # define __GCC4_has_attribute___designated_init__     0
+# define __GCC4_has_attribute___error__               1
 # define __GCC4_has_attribute___externally_visible__  1
 # define __GCC4_has_attribute___no_caller_saved_registers__ 0
 # define __GCC4_has_attribute___noclone__             1
@@ -37,6 +38,7 @@
 # define __GCC4_has_attribute___no_sanitize_address__ (__GNUC_MINOR__ >= 8)
 # define __GCC4_has_attribute___no_sanitize_undefined__ (__GNUC_MINOR__ >= 9)
 # define __GCC4_has_attribute___fallthrough__         0
+# define __GCC4_has_attribute___warning__             1
 #endif
 
 /*
@@ -136,6 +138,17 @@
 # define __designated_init
 #endif
 
+/*
+ * Optional: only supported since clang >= 14.0
+ *
+ *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-error-function-attribute
+ */
+#if __has_attribute(__error__)
+# define __compiletime_error(msg)       __attribute__((__error__(msg)))
+#else
+# define __compiletime_error(msg)
+#endif
+
 /*
  * Optional: not supported by clang
  *
@@ -272,6 +285,17 @@
  */
 #define __used                          __attribute__((__used__))
 
+/*
+ * Optional: only supported since clang >= 14.0
+ *
+ *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-warning-function-attribute
+ */
+#if __has_attribute(__warning__)
+# define __compiletime_warning(msg)     __attribute__((__warning__(msg)))
+#else
+# define __compiletime_warning(msg)
+#endif
+
 /*
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-weak-function-attribute
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-weak-variable-attribute
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index 2a1c202baa1f..eb2bda017ccb 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -281,12 +281,6 @@ struct ftrace_likely_data {
 #ifndef __compiletime_object_size
 # define __compiletime_object_size(obj) -1
 #endif
-#ifndef __compiletime_warning
-# define __compiletime_warning(message)
-#endif
-#ifndef __compiletime_error
-# define __compiletime_error(message)
-#endif
 
 #ifdef __OPTIMIZE__
 # define __compiletime_assert(condition, msg, prefix, suffix)		\