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160 lines
4.7 KiB
160 lines
4.7 KiB
# 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 += -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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EXTRA_WARNINGS += -Wno-type-limits |
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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) = $(2))) |
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endef |
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ifneq ($(LLVM),) |
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$(call allow-override,CC,clang) |
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$(call allow-override,AR,llvm-ar) |
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$(call allow-override,LD,ld.lld) |
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$(call allow-override,CXX,clang++) |
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$(call allow-override,STRIP,llvm-strip) |
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else |
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# Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix. |
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$(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) |
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endif |
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CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?) |
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ifneq ($(LLVM),) |
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HOSTAR ?= llvm-ar |
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HOSTCC ?= clang |
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HOSTLD ?= ld.lld |
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else |
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HOSTAR ?= ar |
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HOSTCC ?= gcc |
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HOSTLD ?= ld |
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endif |
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# Some tools require Clang, LLC and/or LLVM utils |
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CLANG ?= clang |
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LLC ?= llc |
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LLVM_CONFIG ?= llvm-config |
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LLVM_OBJCOPY ?= llvm-objcopy |
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LLVM_STRIP ?= llvm-strip |
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ifeq ($(CC_NO_CLANG), 1) |
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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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# |
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# See https://lore.kernel.org/lkml/[email protected]/ |
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# and https://gcc.gnu.org/gcc-4.8/changes.html, |
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# that takes into account Linus's comments (search for Wshadow) for the reasoning about |
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# -Wshadow not being interesting before gcc 4.8. |
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ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3 |
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EXTRA_WARNINGS += -fno-strict-aliasing |
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EXTRA_WARNINGS += -Wno-shadow |
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else |
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EXTRA_WARNINGS += -Wshadow |
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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_CLANG = @echo ' CLANG '$@; |
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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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QUIET_GENSKEL = @echo ' GENSKEL '$@; |
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descend = \ |
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+@echo ' DESCEND '$(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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QUIET_UNINST = @printf ' UNINST %s\n' $1; |
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endif |
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endif |
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pound := \#
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