Merge tag 'kbuild-fixes-v4.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - fix O= building on dash

 - remove unused dependency in Makefile

 - fix default of a choice in Kconfig

 - fix typos and documentation style

 - fix command options unrecognized by sparse

* tag 'kbuild-fixes-v4.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: clang: fix build failures with sparse check
  kbuild doc: a bundle of fixes on makefiles.txt
  Makefile: kselftest: fix grammar typo
  kbuild: Fix optimization level choice default
  kbuild: drop unused symverfile in Makefile.modpost
  kbuild: revert $(realpath ...) to $(shell cd ... && /bin/pwd)

6 files changed, 28 insertions, 24 deletions

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 329e740adea7..f6f80380dff2 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -1108,14 +1108,6 @@ When kbuild executes, the following steps are followed (roughly):
     ld
         Link target. Often, LDFLAGS_$@ is used to set specific options to ld.
 
-    objcopy
-        Copy binary. Uses OBJCOPYFLAGS usually specified in
-        arch/$(ARCH)/Makefile.
-        OBJCOPYFLAGS_$@ may be used to set additional options.
-
-    gzip
-        Compress target. Use maximum compression to compress target.
-
         Example:
                 #arch/x86/boot/Makefile
                 LDFLAGS_bootsect := -Ttext 0x0 -s --oformat binary
@@ -1139,6 +1131,19 @@ When kbuild executes, the following steps are followed (roughly):
               resulting in the target file being recompiled for no
               obvious reason.
 
+    objcopy
+        Copy binary. Uses OBJCOPYFLAGS usually specified in
+        arch/$(ARCH)/Makefile.
+        OBJCOPYFLAGS_$@ may be used to set additional options.
+
+    gzip
+        Compress target. Use maximum compression to compress target.
+
+        Example:
+                #arch/x86/boot/compressed/Makefile
+                $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE
+                        $(call if_changed,gzip)
+
     dtc
         Create flattened device tree blob object suitable for linking
         into vmlinux. Device tree blobs linked into vmlinux are placed
@@ -1219,7 +1224,7 @@ When kbuild executes, the following steps are followed (roughly):
         that may be shared between individual architectures.
         The recommended approach how to use a generic header file is
         to list the file in the Kbuild file.
-        See "7.3 generic-y" for further info on syntax etc.
+        See "7.2 generic-y" for further info on syntax etc.
 
 --- 6.11 Post-link pass
 
@@ -1254,13 +1259,13 @@ A Kbuild file may be defined under arch/<arch>/include/uapi/asm/ and
 arch/<arch>/include/asm/ to list asm files coming from asm-generic.
 See subsequent chapter for the syntax of the Kbuild file.
 
-        --- 7.1 no-export-headers
+--- 7.1 no-export-headers
 
         no-export-headers is essentially used by include/uapi/linux/Kbuild to
         avoid exporting specific headers (e.g. kvm.h) on architectures that do
         not support it. It should be avoided as much as possible.
 
-        --- 7.2 generic-y
+--- 7.2 generic-y
 
         If an architecture uses a verbatim copy of a header from
         include/asm-generic then this is listed in the file
@@ -1287,7 +1292,7 @@ See subsequent chapter for the syntax of the Kbuild file.
                 Example: termios.h
                         #include <asm-generic/termios.h>
 
-        --- 7.3 generated-y
+--- 7.3 generated-y
 
         If an architecture generates other header files alongside generic-y
         wrappers, generated-y specifies them.
@@ -1299,7 +1304,7 @@ See subsequent chapter for the syntax of the Kbuild file.
                         #arch/x86/include/asm/Kbuild
                         generated-y += syscalls_32.h
 
-        --- 7.5 mandatory-y
+--- 7.4 mandatory-y
 
         mandatory-y is essentially used by include/uapi/asm-generic/Kbuild.asm
         to define the minimum set of headers that must be exported in
diff --git a/Makefile b/Makefile
index 01875d606f44..2900c54f34ce 100644
--- a/Makefile
+++ b/Makefile
@@ -130,8 +130,8 @@ endif
 ifneq ($(KBUILD_OUTPUT),)
 # check that the output directory actually exists
 saved-output := $(KBUILD_OUTPUT)
-$(shell [ -d $(KBUILD_OUTPUT) ] || mkdir -p $(KBUILD_OUTPUT))
-KBUILD_OUTPUT := $(realpath $(KBUILD_OUTPUT))
+KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
+                                                                && /bin/pwd)
 $(if $(KBUILD_OUTPUT),, \
      $(error failed to create output directory "$(saved-output)"))
 
@@ -697,11 +697,11 @@ KBUILD_CFLAGS += $(stackp-flag)
 
 ifeq ($(cc-name),clang)
 ifneq ($(CROSS_COMPILE),)
-CLANG_TARGET    := -target $(notdir $(CROSS_COMPILE:%-=%))
+CLANG_TARGET    := --target=$(notdir $(CROSS_COMPILE:%-=%))
 GCC_TOOLCHAIN   := $(realpath $(dir $(shell which $(LD)))/..)
 endif
 ifneq ($(GCC_TOOLCHAIN),)
-CLANG_GCC_TC    := -gcc-toolchain $(GCC_TOOLCHAIN)
+CLANG_GCC_TC    := --gcc-toolchain=$(GCC_TOOLCHAIN)
 endif
 KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
 KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
@@ -1399,7 +1399,7 @@ help:
         @echo  '                    Build, install, and boot kernel before'
         @echo  '                    running kselftest on it'
         @echo  '  kselftest-clean - Remove all generated kselftest files'
-        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
+        @echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
         @echo  '                    .config.'
         @echo  ''
         @echo 'Userspace tools targets:'
diff --git a/init/Kconfig b/init/Kconfig
index 78cb2461012e..3c1faaa2af4a 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1033,7 +1033,7 @@ endif
 
 choice
         prompt "Compiler optimization level"
-        default CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
+        default CC_OPTIMIZE_FOR_PERFORMANCE
 
 config CC_OPTIMIZE_FOR_PERFORMANCE
         bool "Optimize for performance"
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 16923ba4b5b1..756d14f0d763 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -97,7 +97,6 @@ vmlinux.o: FORCE
         $(call cmd,kernel-mod)
 
 # Declare generated files as targets for modpost
-$(symverfile):         __modpost ;
 $(modules:.ko=.mod.c): __modpost ;
 
 
diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile
index 4c5a481a850c..d6e1c02ddcfe 100644
--- a/tools/power/cpupower/Makefile
+++ b/tools/power/cpupower/Makefile
@@ -26,7 +26,7 @@ endif
 
 ifneq ($(OUTPUT),)
 # check that the output directory actually exists
-OUTDIR := $(realpath $(OUTPUT))
+OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
 endif
 
diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index 9dc8f078a83c..1e8b6116ba3c 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -1,7 +1,7 @@
 ifneq ($(O),)
 ifeq ($(origin O), command line)
-        ABSOLUTE_O := $(realpath $(O))
-        dummy := $(if $(ABSOLUTE_O),,$(error O=$(O) does not exist))
+        dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
+        ABSOLUTE_O := $(shell cd $(O) ; pwd)
         OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
         COMMAND_O := O=$(ABSOLUTE_O)
 ifeq ($(objtree),)
@@ -12,7 +12,7 @@ endif
 
 # check that the output directory actually exists
 ifneq ($(OUTPUT),)
-OUTDIR := $(realpath $(OUTPUT))
+OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
 endif