tools/scripts/Makefile.include

   1 # SPDX-License-Identifier: GPL-2.0
   2 ifneq ($(O),)
   3 ifeq ($(origin O), command line)
   4         dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
   5         ABSOLUTE_O := $(shell cd $(O) ; pwd)
   6         OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
   7         COMMAND_O := O=$(ABSOLUTE_O)
   8 ifeq ($(objtree),)
   9         objtree := $(O)
  10 endif
  11 endif
  12 endif
  13
  14 # check that the output directory actually exists
  15 ifneq ($(OUTPUT),)
  16 OUTDIR := $(shell cd $(OUTPUT) && pwd)
  17 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
  18 endif
  19
  20 #
  21 # Include saner warnings here, which can catch bugs:
  22 #
  23 EXTRA_WARNINGS := -Wbad-function-cast
  24 EXTRA_WARNINGS += -Wdeclaration-after-statement
  25 EXTRA_WARNINGS += -Wformat-security
  26 EXTRA_WARNINGS += -Wformat-y2k
  27 EXTRA_WARNINGS += -Winit-self
  28 EXTRA_WARNINGS += -Wmissing-declarations
  29 EXTRA_WARNINGS += -Wmissing-prototypes
  30 EXTRA_WARNINGS += -Wnested-externs
  31 EXTRA_WARNINGS += -Wno-system-headers
  32 EXTRA_WARNINGS += -Wold-style-definition
  33 EXTRA_WARNINGS += -Wpacked
  34 EXTRA_WARNINGS += -Wredundant-decls
  35 EXTRA_WARNINGS += -Wshadow
  36 EXTRA_WARNINGS += -Wstrict-prototypes
  37 EXTRA_WARNINGS += -Wswitch-default
  38 EXTRA_WARNINGS += -Wswitch-enum
  39 EXTRA_WARNINGS += -Wundef
  40 EXTRA_WARNINGS += -Wwrite-strings
  41 EXTRA_WARNINGS += -Wformat
  42
  43 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
  44
  45 # Makefiles suck: This macro sets a default value of $(2) for the
  46 # variable named by $(1), unless the variable has been set by
  47 # environment or command line. This is necessary for CC and AR
  48 # because make sets default values, so the simpler ?= approach
  49 # won't work as expected.
  50 define allow-override
  51   $(if $(or $(findstring environment,$(origin $(1))),\
  52             $(findstring command line,$(origin $(1)))),,\
  53     $(eval $(1) = $(2)))
  54 endef
  55
  56 # Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
  57 $(call allow-override,CC,$(CROSS_COMPILE)gcc)
  58 $(call allow-override,AR,$(CROSS_COMPILE)ar)
  59 $(call allow-override,LD,$(CROSS_COMPILE)ld)
  60 $(call allow-override,CXX,$(CROSS_COMPILE)g++)
  61 $(call allow-override,STRIP,$(CROSS_COMPILE)strip)
  62
  63 ifeq ($(CC_NO_CLANG), 1)
  64 EXTRA_WARNINGS += -Wstrict-aliasing=3
  65 endif
  66
  67 # Hack to avoid type-punned warnings on old systems such as RHEL5:
  68 # We should be changing CFLAGS and checking gcc version, but this
  69 # will do for now and keep the above -Wstrict-aliasing=3 in place
  70 # in newer systems.
  71 # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
  72 ifneq ($(filter 3.%,$(MAKE_VERSION)),)  # make-3
  73 EXTRA_WARNINGS += -fno-strict-aliasing
  74 endif
  75
  76 ifneq ($(findstring $(MAKEFLAGS), w),w)
  77 PRINT_DIR = --no-print-directory
  78 else
  79 NO_SUBDIR = :
  80 endif
  81
  82 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  83   silent=1
  84 endif
  85
  86 #
  87 # Define a callable command for descending to a new directory
  88 #
  89 # Call by doing: $(call descend,directory[,target])
  90 #
  91 descend = \
  92         +mkdir -p $(OUTPUT)$(1) && \
  93         $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
  94
  95 QUIET_SUBDIR0  = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
  96 QUIET_SUBDIR1  =
  97
  98 ifneq ($(silent),1)
  99   ifneq ($(V),1)
 100         QUIET_CC       = @echo '  CC       '$@;
 101         QUIET_CC_FPIC  = @echo '  CC FPIC  '$@;
 102         QUIET_AR       = @echo '  AR       '$@;
 103         QUIET_LINK     = @echo '  LINK     '$@;
 104         QUIET_MKDIR    = @echo '  MKDIR    '$@;
 105         QUIET_GEN      = @echo '  GEN      '$@;
 106         QUIET_SUBDIR0  = +@subdir=
 107         QUIET_SUBDIR1  = ;$(NO_SUBDIR) \
 108                           echo '  SUBDIR   '$$subdir; \
 109                          $(MAKE) $(PRINT_DIR) -C $$subdir
 110         QUIET_FLEX     = @echo '  FLEX     '$@;
 111         QUIET_BISON    = @echo '  BISON    '$@;
 112
 113         descend = \
 114                 +@echo         '  DESCEND  '$(1); \
 115                 mkdir -p $(OUTPUT)$(1) && \
 116                 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
 117
 118         QUIET_CLEAN    = @printf '  CLEAN    %s\n' $1;
 119         QUIET_INSTALL  = @printf '  INSTALL  %s\n' $1;
 120         QUIET_UNINST   = @printf '  UNINST   %s\n' $1;
 121   endif
 122 endif