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Clang build fixes for 7.1 #2

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- Account for recently implemented -Wattribute-alias in clang by
   disabling it in the same places it is disabled for GCC.
 
 Signed-off-by: Nathan Chancellor <nathan@kernel.org>
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Merge tag 'clang-fixes-7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/nathan/linux

Pull clang build fix from Nathan Chancellor:
 "A small fix to disable -Wattribute-alias for clang in the few places
  it is already disabled for GCC, now that tip of tree clang has
  implemented -Wattribute-alias as GCC has"

* tag 'clang-fixes-7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/nathan/linux:
  Disable -Wattribute-alias for clang-23 and newer
This commit is contained in:
Linus Torvalds 2026-05-29 15:17:53 -07:00
commit 77590cacab
5 changed files with 22 additions and 0 deletions
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4
arch/riscv/include/asm/syscall_wrapper.h
View File

@ -32,6 +32,10 @@ asmlinkage long __riscv_sys_ni_syscall(const struct pt_regs *);
__diag_push(); \
__diag_ignore(GCC, 8, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments"); \
__diag_ignore(clang, 23, "-Wunknown-warning-option", \
"Avoid breaking versions without -Wattribute-alias"); \
__diag_ignore(clang, 23, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments"); \
static long __se_##prefix##name(ulong, ulong, ulong, ulong, ulong, ulong, \
ulong) \
__attribute__((alias(__stringify(___se_##prefix##name)))); \

4
include/linux/compat.h
View File

@ -72,6 +72,10 @@
__diag_push(); \
__diag_ignore(GCC, 8, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments");\
__diag_ignore(clang, 23, "-Wunknown-warning-option", \
"Avoid breaking versions without -Wattribute-alias"); \
__diag_ignore(clang, 23, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments"); \
asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(__se_compat_sys##name)))); \
ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO); \

6
include/linux/compiler-clang.h
View File

@ -131,6 +131,12 @@
#define __diag_str(s) __diag_str1(s)
#define __diag(s) _Pragma(__diag_str(clang diagnostic s))
#if CONFIG_CLANG_VERSION >= 230000
#define __diag_clang_23(s) __diag(s)
#else
#define __diag_clang_23(s)
#endif
#define __diag_clang_13(s) __diag(s)
#define __diag_ignore_all(option, comment) \

4
include/linux/compiler_types.h
View File

@ -711,6 +711,10 @@ struct ftrace_likely_data {
#define __diag_GCC(version, severity, string)
#endif
#ifndef __diag_clang
#define __diag_clang(version, severity, string)
#endif
#define __diag_push() __diag(push)
#define __diag_pop() __diag(pop)

4
include/linux/syscalls.h
View File

@ -247,6 +247,10 @@ static inline int is_syscall_trace_event(struct trace_event_call *tp_event)
__diag_push(); \
__diag_ignore(GCC, 8, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments");\
__diag_ignore(clang, 23, "-Wunknown-warning-option", \
"Avoid breaking versions without -Wattribute-alias");\
__diag_ignore(clang, 23, "-Wattribute-alias", \
"Type aliasing is used to sanitize syscall arguments");\
asmlinkage long sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(__se_sys##name)))); \
ALLOW_ERROR_INJECTION(sys##name, ERRNO); \