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8e9b466799
Kbuild conventionally uses $(shell cd ... && /bin/pwd) idiom to get
the absolute path of the directory because GNU Make 3.80, the minimal
supported version at that time, did not support $(abspath ...) or
$(realpath ...).
Commit 37d69ee308 ("docs: bump minimal GNU Make version to 3.81")
dropped the GNU Make 3.80 support, so we are now allowed to use those
make-builtin helpers.
This conversion will provide better portability without relying on
the pwd command or its location /bin/pwd.
I am intentionally using $(realpath ...) instead $(abspath ...) in
some places. The difference between the two is $(realpath ...)
returns an empty string if the given path does not exist. It is
convenient in places where we need to error-out if the makefile fails
to create an output directory.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Thierry Reding <treding@nvidia.com>
101 lines
2.9 KiB
Makefile
101 lines
2.9 KiB
Makefile
ifneq ($(O),)
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ifeq ($(origin O), command line)
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ABSOLUTE_O := $(realpath $(O))
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dummy := $(if $(ABSOLUTE_O),,$(error O=$(O) does not exist))
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OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
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COMMAND_O := O=$(ABSOLUTE_O)
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ifeq ($(objtree),)
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objtree := $(O)
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endif
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endif
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endif
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# check that the output directory actually exists
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ifneq ($(OUTPUT),)
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OUTDIR := $(realpath $(OUTPUT))
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$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
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endif
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#
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# Include saner warnings here, which can catch bugs:
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#
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EXTRA_WARNINGS := -Wbad-function-cast
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EXTRA_WARNINGS += -Wdeclaration-after-statement
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EXTRA_WARNINGS += -Wformat-security
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EXTRA_WARNINGS += -Wformat-y2k
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EXTRA_WARNINGS += -Winit-self
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EXTRA_WARNINGS += -Wmissing-declarations
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EXTRA_WARNINGS += -Wmissing-prototypes
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EXTRA_WARNINGS += -Wnested-externs
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EXTRA_WARNINGS += -Wno-system-headers
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EXTRA_WARNINGS += -Wold-style-definition
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EXTRA_WARNINGS += -Wpacked
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EXTRA_WARNINGS += -Wredundant-decls
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EXTRA_WARNINGS += -Wshadow
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EXTRA_WARNINGS += -Wstrict-prototypes
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EXTRA_WARNINGS += -Wswitch-default
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EXTRA_WARNINGS += -Wswitch-enum
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EXTRA_WARNINGS += -Wundef
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EXTRA_WARNINGS += -Wwrite-strings
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EXTRA_WARNINGS += -Wformat
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ifneq ($(CC), clang)
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EXTRA_WARNINGS += -Wstrict-aliasing=3
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endif
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# Hack to avoid type-punned warnings on old systems such as RHEL5:
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# We should be changing CFLAGS and checking gcc version, but this
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# will do for now and keep the above -Wstrict-aliasing=3 in place
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# in newer systems.
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# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
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ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
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EXTRA_WARNINGS += -fno-strict-aliasing
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endif
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ifneq ($(findstring $(MAKEFLAGS), w),w)
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PRINT_DIR = --no-print-directory
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else
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NO_SUBDIR = :
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endif
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ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
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silent=1
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endif
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#
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# Define a callable command for descending to a new directory
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#
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# Call by doing: $(call descend,directory[,target])
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#
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descend = \
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+mkdir -p $(OUTPUT)$(1) && \
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$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
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QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
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QUIET_SUBDIR1 =
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ifneq ($(silent),1)
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ifneq ($(V),1)
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QUIET_CC = @echo ' CC '$@;
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QUIET_CC_FPIC = @echo ' CC FPIC '$@;
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QUIET_AR = @echo ' AR '$@;
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QUIET_LINK = @echo ' LINK '$@;
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QUIET_MKDIR = @echo ' MKDIR '$@;
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QUIET_GEN = @echo ' GEN '$@;
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QUIET_SUBDIR0 = +@subdir=
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QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
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echo ' SUBDIR '$$subdir; \
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$(MAKE) $(PRINT_DIR) -C $$subdir
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QUIET_FLEX = @echo ' FLEX '$@;
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QUIET_BISON = @echo ' BISON '$@;
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descend = \
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+@echo ' DESCEND '$(1); \
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mkdir -p $(OUTPUT)$(1) && \
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$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
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QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
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QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
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endif
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endif
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