diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index 329e740adea70db91ac2c9cd9f671f79ca58790e..f6f80380dff2fa0851c5ae02de27497e9bc9c0df 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 + $(call if_changed,gzip) + dtc Create flattened device tree blob object suitable for linking into vmlinux. Device tree blobs linked into vmlinux are placed @@ -1219,7 +1224,7 @@ When kbuild executes, the following steps are followed (roughly): that may be shared between individual architectures. The recommended approach how to use a generic header file is to list the file in the Kbuild file. - See "7.3 generic-y" for further info on syntax etc. + See "7.2 generic-y" for further info on syntax etc. --- 6.11 Post-link pass @@ -1254,13 +1259,13 @@ A Kbuild file may be defined under arch//include/uapi/asm/ and arch//include/asm/ to list asm files coming from asm-generic. See subsequent chapter for the syntax of the Kbuild file. - --- 7.1 no-export-headers +--- 7.1 no-export-headers no-export-headers is essentially used by include/uapi/linux/Kbuild to avoid exporting specific headers (e.g. kvm.h) on architectures that do not support it. It should be avoided as much as possible. - --- 7.2 generic-y +--- 7.2 generic-y If an architecture uses a verbatim copy of a header from include/asm-generic then this is listed in the file @@ -1287,7 +1292,7 @@ See subsequent chapter for the syntax of the Kbuild file. Example: termios.h #include - --- 7.3 generated-y +--- 7.3 generated-y If an architecture generates other header files alongside generic-y wrappers, generated-y specifies them. @@ -1299,7 +1304,7 @@ See subsequent chapter for the syntax of the Kbuild file. #arch/x86/include/asm/Kbuild generated-y += syscalls_32.h - --- 7.5 mandatory-y +--- 7.4 mandatory-y mandatory-y is essentially used by include/uapi/asm-generic/Kbuild.asm to define the minimum set of headers that must be exported in diff --git a/Makefile b/Makefile index 01875d606f44d8014abb9e140b01556d5844bc8b..2900c54f34ce1267f9247353d9f1e1a91a4a9c83 100644 --- a/Makefile +++ b/Makefile @@ -130,8 +130,8 @@ endif ifneq ($(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 78cb2461012ef530f2755a0a6a8458428ed19043..3c1faaa2af4aad761c427a092c929aeb1acb05f6 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 16923ba4b5b1005158508b4e0c9d2b3d947c119c..756d14f0d76384274f9dd04ac1045a0d00f87e2c 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 ; $(modules:.ko=.mod.c): __modpost ; diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile index 4c5a481a850c6d4490db28ae0d6448197e4b4517..d6e1c02ddcfead4532cdc73f2d81207f62a8db5f 100644 --- a/tools/power/cpupower/Makefile +++ b/tools/power/cpupower/Makefile @@ -26,7 +26,7 @@ endif ifneq ($(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 9dc8f078a83c87e361883569e06fd86889a9164e..1e8b6116ba3c4ee03e137b737b84aaa26d133b94 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