Merge tag 'kbuild-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Add -s option (strict mode) to merge_config.sh to make it fail when
   any symbol is redefined.

 - Show a warning if a different compiler is used for building external
   modules.

 - Infer --target from ARCH for CC=clang to let you cross-compile the
   kernel without CROSS_COMPILE.

 - Make the integrated assembler default (LLVM_IAS=1) for CC=clang.

 - Add <linux/stdarg.h> to the kernel source instead of borrowing
   <stdarg.h> from the compiler.

 - Add Nick Desaulniers as a Kbuild reviewer.

 - Drop stale cc-option tests.

 - Fix the combination of CONFIG_TRIM_UNUSED_KSYMS and CONFIG_LTO_CLANG
   to handle symbols in inline assembly.

 - Show a warning if 'FORCE' is missing for if_changed rules.

 - Various cleanups

* tag 'kbuild-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (39 commits)
  kbuild: redo fake deps at include/ksym/*.h
  kbuild: clean up objtool_args slightly
  modpost: get the *.mod file path more simply
  checkkconfigsymbols.py: Fix the '--ignore' option
  kbuild: merge vmlinux_link() between ARCH=um and other architectures
  kbuild: do not remove 'linux' link in scripts/link-vmlinux.sh
  kbuild: merge vmlinux_link() between the ordinary link and Clang LTO
  kbuild: remove stale *.symversions
  kbuild: remove unused quiet_cmd_update_lto_symversions
  gen_compile_commands: extract compiler command from a series of commands
  x86: remove cc-option-yn test for -mtune=
  arc: replace cc-option-yn uses with cc-option
  s390: replace cc-option-yn uses with cc-option
  ia64: move core-y in arch/ia64/Makefile to arch/ia64/Kbuild
  sparc: move the install rule to arch/sparc/Makefile
  security: remove unneeded subdir-$(CONFIG_...)
  kbuild: sh: remove unused install script
  kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y
  kbuild: Switch to 'f' variants of integrated assembler flag
  kbuild: Shuffle blank line to improve comment meaning
  ...

6 files changed, 14 insertions, 6 deletions

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 7d248941ecea..4a93c12543ee 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -5,8 +5,6 @@
 #ifndef __LINUX_FILTER_H__
 #define __LINUX_FILTER_H__
 
-#include <stdarg.h>
-
 #include <linux/atomic.h>
 #include <linux/refcount.h>
 #include <linux/compat.h>
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 1b2f0a7e00d6..2776423a587e 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -2,7 +2,7 @@
 #ifndef _LINUX_KERNEL_H
 #define _LINUX_KERNEL_H
 
-#include <stdarg.h>
+#include <linux/stdarg.h>
 #include <linux/align.h>
 #include <linux/limits.h>
 #include <linux/linkage.h>
diff --git a/include/linux/mISDNif.h b/include/linux/mISDNif.h
index a7330eb3ec64..7dd1f01ec4f9 100644
--- a/include/linux/mISDNif.h
+++ b/include/linux/mISDNif.h
@@ -18,7 +18,6 @@
 #ifndef mISDNIF_H
 #define mISDNIF_H
 
-#include <stdarg.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/socket.h>
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 259af4f97f50..85b656f82d75 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -2,7 +2,7 @@
 #ifndef __KERNEL_PRINTK__
 #define __KERNEL_PRINTK__
 
-#include <stdarg.h>
+#include <linux/stdarg.h>
 #include <linux/init.h>
 #include <linux/kern_levels.h>
 #include <linux/linkage.h>
diff --git a/include/linux/stdarg.h b/include/linux/stdarg.h
new file mode 100644
index 000000000000..c8dc7f4f390c
--- /dev/null
+++ b/include/linux/stdarg.h
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef _LINUX_STDARG_H
+#define _LINUX_STDARG_H
+
+typedef __builtin_va_list va_list;
+#define va_start(v, l)	__builtin_va_start(v, l)
+#define va_end(v)	__builtin_va_end(v)
+#define va_arg(v, T)	__builtin_va_arg(v, T)
+#define va_copy(d, s)	__builtin_va_copy(d, s)
+
+#endif
diff --git a/include/linux/string.h b/include/linux/string.h
index b48d2d28e0b1..5e96d656be7a 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -6,7 +6,7 @@
 #include <linux/types.h>	/* for size_t */
 #include <linux/stddef.h>	/* for NULL */
 #include <linux/errno.h>	/* for E2BIG */
-#include <stdarg.h>
+#include <linux/stdarg.h>
 #include <uapi/linux/string.h>
 
 extern char *strndup_user(const char __user *, long);