diff options
Diffstat (limited to 'tools/scripts/Makefile.include')
| -rw-r--r-- | tools/scripts/Makefile.include | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include new file mode 100644 index 000000000..a3f99ef6b --- /dev/null +++ b/tools/scripts/Makefile.include @@ -0,0 +1,150 @@ +# SPDX-License-Identifier: GPL-2.0 +ifneq ($(O),) +ifeq ($(origin O), command line) + dummy := $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),) + ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd) + OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/) + COMMAND_O := O=$(ABSOLUTE_O) +ifeq ($(objtree),) + objtree := $(O) +endif +endif +endif + +# check that the output directory actually exists +ifneq ($(OUTPUT),) +OUTDIR := $(shell cd $(OUTPUT) && pwd) +$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist)) +endif + +# +# Include saner warnings here, which can catch bugs: +# +EXTRA_WARNINGS := -Wbad-function-cast +EXTRA_WARNINGS += -Wdeclaration-after-statement +EXTRA_WARNINGS += -Wformat-security +EXTRA_WARNINGS += -Wformat-y2k +EXTRA_WARNINGS += -Winit-self +EXTRA_WARNINGS += -Wmissing-declarations +EXTRA_WARNINGS += -Wmissing-prototypes +EXTRA_WARNINGS += -Wnested-externs +EXTRA_WARNINGS += -Wno-system-headers +EXTRA_WARNINGS += -Wold-style-definition +EXTRA_WARNINGS += -Wpacked +EXTRA_WARNINGS += -Wredundant-decls +EXTRA_WARNINGS += -Wstrict-prototypes +EXTRA_WARNINGS += -Wswitch-default +EXTRA_WARNINGS += -Wswitch-enum +EXTRA_WARNINGS += -Wundef +EXTRA_WARNINGS += -Wwrite-strings +EXTRA_WARNINGS += -Wformat + +# Makefiles suck: This macro sets a default value of $(2) for the +# variable named by $(1), unless the variable has been set by +# environment or command line. This is necessary for CC and AR +# because make sets default values, so the simpler ?= approach +# won't work as expected. +define allow-override + $(if $(or $(findstring environment,$(origin $(1))),\ + $(findstring command line,$(origin $(1)))),,\ + $(eval $(1) = $(2))) +endef + +ifneq ($(LLVM),) +$(call allow-override,CC,clang) +$(call allow-override,AR,llvm-ar) +$(call allow-override,LD,ld.lld) +$(call allow-override,CXX,clang++) +$(call allow-override,STRIP,llvm-strip) +else +# Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix. +$(call allow-override,CC,$(CROSS_COMPILE)gcc) +$(call allow-override,AR,$(CROSS_COMPILE)ar) +$(call allow-override,LD,$(CROSS_COMPILE)ld) +$(call allow-override,CXX,$(CROSS_COMPILE)g++) +$(call allow-override,STRIP,$(CROSS_COMPILE)strip) +endif + +CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?) + +ifneq ($(LLVM),) +HOSTAR ?= llvm-ar +HOSTCC ?= clang +HOSTLD ?= ld.lld +else +HOSTAR ?= ar +HOSTCC ?= gcc +HOSTLD ?= ld +endif + +ifeq ($(CC_NO_CLANG), 1) +EXTRA_WARNINGS += -Wstrict-aliasing=3 +endif + +# Hack to avoid type-punned warnings on old systems such as RHEL5: +# We should be changing CFLAGS and checking gcc version, but this +# will do for now and keep the above -Wstrict-aliasing=3 in place +# in newer systems. +# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h +# +# See https://lkml.org/lkml/2006/11/28/253 and https://gcc.gnu.org/gcc-4.8/changes.html, +# that takes into account Linus's comments (search for Wshadow) for the reasoning about +# -Wshadow not being interesting before gcc 4.8. + +ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3 +EXTRA_WARNINGS += -fno-strict-aliasing +EXTRA_WARNINGS += -Wno-shadow +else +EXTRA_WARNINGS += -Wshadow +endif + +ifneq ($(findstring $(MAKEFLAGS), w),w) +PRINT_DIR = --no-print-directory +else +NO_SUBDIR = : +endif + +ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) + silent=1 +endif + +# +# Define a callable command for descending to a new directory +# +# Call by doing: $(call descend,directory[,target]) +# +descend = \ + +mkdir -p $(OUTPUT)$(1) && \ + $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) + +QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir +QUIET_SUBDIR1 = + +ifneq ($(silent),1) + ifneq ($(V),1) + QUIET_CC = @echo ' CC '$@; + QUIET_CC_FPIC = @echo ' CC FPIC '$@; + QUIET_CLANG = @echo ' CLANG '$@; + QUIET_AR = @echo ' AR '$@; + QUIET_LINK = @echo ' LINK '$@; + QUIET_MKDIR = @echo ' MKDIR '$@; + QUIET_GEN = @echo ' GEN '$@; + QUIET_SUBDIR0 = +@subdir= + QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ + echo ' SUBDIR '$$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 := \# |