[PATCH] kbuild: take vmlinux.[ao] out of single-targets

[Wei Yang <richard.weiyang@gmail.com>]

For current kernel, when we make vmlinux.a or vmlinux.o, following
message would display.

$make vmlinux.o
/dir/to/kernel/Makefile:1887: warning: overriding recipe for target 'vmlinux.o'
/dir/to/kernel/Makefile:1138: warning: ignoring old recipe for target 'vmlinux.o'
  CALL    scripts/checksyscalls.sh
  DESCEND objtool
  INSTALL libsubcmd_headers
make[2]: Nothing to be done for 'vmlinux.o'.

The reason is vmlinux.[ao] is treated as single target, while the rule
is written in root Makefile.

This patch fixes this by take them out of single-targets.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
CC: Masahiro Yamada <masahiroy@kernel.org>
CC: Miguel Ojeda <ojeda@kernel.org>
CC: Nathan Chancellor <nathan@kernel.org>
---
 Makefile | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index f1b2fd977275..66fb08f6d971 100644
--- a/Makefile
+++ b/Makefile
@@ -280,6 +280,7 @@ no-dot-config-targets := $(clean-targets) \
 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
 			  image_name
 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
+no-single-targets := vmlinux.o vmlinux.a
 
 config-build	:=
 mixed-build	:=
@@ -315,11 +316,14 @@ ifeq ($(KBUILD_EXTMOD),)
 endif
 
 # We cannot build single targets and the others at the same time
-ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
+ifneq ($(filter-out $(no-single-targets), $(filter $(single-targets), $(MAKECMDGOALS))),)
 	single-build := 1
 	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
 		mixed-build := 1
 	endif
+	ifneq ($(filter $(no-single-targets), $(MAKECMDGOALS)),)
+		mixed-build := 1
+	endif
 endif
 
 # For "make -j clean all", "make -j mrproper defconfig all", etc.
-- 
2.34.1