# SPDX-License-Identifier: GPL-2.0
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ifneq ($(O),)
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ifeq ($(origin O), command line)
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dummy := $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
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ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd)
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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 := $(shell cd $(OUTPUT) && pwd)
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$(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
|
|
CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
|
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# Makefiles suck: This macro sets a default value of $(2) for the
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# variable named by $(1), unless the variable has been set by
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# environment or command line. This is necessary for CC and AR
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# because make sets default values, so the simpler ?= approach
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# won't work as expected.
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define allow-override
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$(if $(or $(findstring environment,$(origin $(1))),\
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$(findstring command line,$(origin $(1)))),,\
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$(eval $(1) = $(2)))
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endef
|
|
# Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
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$(call allow-override,CC,$(CROSS_COMPILE)gcc)
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$(call allow-override,AR,$(CROSS_COMPILE)ar)
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$(call allow-override,LD,$(CROSS_COMPILE)ld)
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$(call allow-override,CXX,$(CROSS_COMPILE)g++)
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$(call allow-override,STRIP,$(CROSS_COMPILE)strip)
|
|
ifneq ($(LLVM),)
|
HOSTAR ?= llvm-ar
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HOSTCC ?= clang
|
HOSTLD ?= ld.lld
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else
|
HOSTAR ?= ar
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HOSTCC ?= gcc
|
HOSTLD ?= ld
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endif
|
|
ifeq ($(CC_NO_CLANG), 1)
|
EXTRA_WARNINGS += -Wstrict-aliasing=3
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endif
|
|
# Hack to avoid type-punned warnings on old systems such as RHEL5:
|
# We should be changing CFLAGS and checking gcc version, but this
|
# will do for now and keep the above -Wstrict-aliasing=3 in place
|
# in newer systems.
|
# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
|
ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
|
EXTRA_WARNINGS += -fno-strict-aliasing
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endif
|
|
ifneq ($(findstring $(MAKEFLAGS), w),w)
|
PRINT_DIR = --no-print-directory
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else
|
NO_SUBDIR = :
|
endif
|
|
ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
|
silent=1
|
endif
|
|
#
|
# Define a callable command for descending to a new directory
|
#
|
# Call by doing: $(call descend,directory[,target])
|
#
|
descend = \
|
+mkdir -p $(OUTPUT)$(1) && \
|
$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
|
|
QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
|
QUIET_SUBDIR1 =
|
|
ifneq ($(silent),1)
|
ifneq ($(V),1)
|
QUIET_CC = @echo ' CC '$@;
|
QUIET_CC_FPIC = @echo ' CC FPIC '$@;
|
QUIET_AR = @echo ' AR '$@;
|
QUIET_LINK = @echo ' LINK '$@;
|
QUIET_MKDIR = @echo ' MKDIR '$@;
|
QUIET_GEN = @echo ' GEN '$@;
|
QUIET_SUBDIR0 = +@subdir=
|
QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
|
echo ' SUBDIR '$$subdir; \
|
$(MAKE) $(PRINT_DIR) -C $$subdir
|
QUIET_FLEX = @echo ' FLEX '$@;
|
QUIET_BISON = @echo ' BISON '$@;
|
|
descend = \
|
+@echo ' DESCEND '$(1); \
|
mkdir -p $(OUTPUT)$(1) && \
|
$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
|
|
QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
|
QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
|
QUIET_UNINST = @printf ' UNINST %s\n' $1;
|
endif
|
endif
|
|
pound := \#
|
