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 += -Wstrict-prototypes
  36 EXTRA_WARNINGS += -Wswitch-default
  37 EXTRA_WARNINGS += -Wswitch-enum
  38 EXTRA_WARNINGS += -Wundef
  39 EXTRA_WARNINGS += -Wwrite-strings
  40 EXTRA_WARNINGS += -Wformat
  41
  42 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
  43
  44 # Makefiles suck: This macro sets a default value of $(2) for the
  45 # variable named by $(1), unless the variable has been set by
  46 # environment or command line. This is necessary for CC and AR
  47 # because make sets default values, so the simpler ?= approach
  48 # won't work as expected.
  49 define allow-override
  50   $(if $(or $(findstring environment,$(origin $(1))),\
  51             $(findstring command line,$(origin $(1)))),,\
  52     $(eval $(1) = $(2)))
  53 endef
  54
  55 # Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
  56 $(call allow-override,CC,$(CROSS_COMPILE)gcc)
  57 $(call allow-override,AR,$(CROSS_COMPILE)ar)
  58 $(call allow-override,LD,$(CROSS_COMPILE)ld)
  59 $(call allow-override,CXX,$(CROSS_COMPILE)g++)
  60 $(call allow-override,STRIP,$(CROSS_COMPILE)strip)
  61
  62 ifeq ($(CC_NO_CLANG), 1)
  63 EXTRA_WARNINGS += -Wstrict-aliasing=3
  64 endif
  65
  66 # Hack to avoid type-punned warnings on old systems such as RHEL5:
  67 # We should be changing CFLAGS and checking gcc version, but this
  68 # will do for now and keep the above -Wstrict-aliasing=3 in place
  69 # in newer systems.
  70 # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
  71 #
  72 # See https://lkml.org/lkml/2006/11/28/253 and https://gcc.gnu.org/gcc-4.8/changes.html,
  73 # that takes into account Linus's comments (search for Wshadow) for the reasoning about
  74 # -Wshadow not being interesting before gcc 4.8.
  75
  76 ifneq ($(filter 3.%,$(MAKE_VERSION)),)  # make-3
  77 EXTRA_WARNINGS += -fno-strict-aliasing
  78 EXTRA_WARNINGS += -Wno-shadow
  79 else
  80 EXTRA_WARNINGS += -Wshadow
  81 endif
  82
  83 ifneq ($(findstring $(MAKEFLAGS), w),w)
  84 PRINT_DIR = --no-print-directory
  85 else
  86 NO_SUBDIR = :
  87 endif
  88
  89 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  90   silent=1
  91 endif
  92
  93 #
  94 # Define a callable command for descending to a new directory
  95 #
  96 # Call by doing: $(call descend,directory[,target])
  97 #
  98 descend = \
  99         +mkdir -p $(OUTPUT)$(1) && \
 100         $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
 101
 102 QUIET_SUBDIR0  = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
 103 QUIET_SUBDIR1  =
 104
 105 ifneq ($(silent),1)
 106   ifneq ($(V),1)
 107         QUIET_CC       = @echo '  CC       '$@;
 108         QUIET_CC_FPIC  = @echo '  CC FPIC  '$@;
 109         QUIET_AR       = @echo '  AR       '$@;
 110         QUIET_LINK     = @echo '  LINK     '$@;
 111         QUIET_MKDIR    = @echo '  MKDIR    '$@;
 112         QUIET_GEN      = @echo '  GEN      '$@;
 113         QUIET_SUBDIR0  = +@subdir=
 114         QUIET_SUBDIR1  = ;$(NO_SUBDIR) \
 115                           echo '  SUBDIR   '$$subdir; \
 116                          $(MAKE) $(PRINT_DIR) -C $$subdir
 117         QUIET_FLEX     = @echo '  FLEX     '$@;
 118         QUIET_BISON    = @echo '  BISON    '$@;
 119
 120         descend = \
 121                 +@echo         '  DESCEND  '$(1); \
 122                 mkdir -p $(OUTPUT)$(1) && \
 123                 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
 124
 125         QUIET_CLEAN    = @printf '  CLEAN    %s\n' $1;
 126         QUIET_INSTALL  = @printf '  INSTALL  %s\n' $1;
 127         QUIET_UNINST   = @printf '  UNINST   %s\n' $1;
 128   endif
 129 endif
 130
 131 pound := \#