1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 ifneq ($(O),) 2 ifneq ($(O),)
3 ifeq ($(origin O), command line) 3 ifeq ($(origin O), command line)
4 $(if $(shell cd $(PWD); test -d $(O) | !! 4 dummy := $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
5 ABSOLUTE_O := $(shell cd $(PWD); cd $( 5 ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd)
6 OUTPUT := $(ABSOLUTE_O)/$(if $(subdir) 6 OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
7 COMMAND_O := O=$(ABSOLUTE_O) 7 COMMAND_O := O=$(ABSOLUTE_O)
8 ifeq ($(objtree),) 8 ifeq ($(objtree),)
9 objtree := $(O) 9 objtree := $(O)
10 endif 10 endif
11 endif 11 endif
12 endif 12 endif
13 13
14 # check that the output directory actually exi 14 # check that the output directory actually exists
15 ifneq ($(OUTPUT),) 15 ifneq ($(OUTPUT),)
16 OUTDIR := $(shell cd $(OUTPUT) && pwd) 16 OUTDIR := $(shell cd $(OUTPUT) && pwd)
17 $(if $(OUTDIR),, $(error output directory "$(O 17 $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
18 endif 18 endif
19 19
20 # 20 #
21 # Include saner warnings here, which can catch 21 # Include saner warnings here, which can catch bugs:
22 # 22 #
23 EXTRA_WARNINGS := -Wbad-function-cast 23 EXTRA_WARNINGS := -Wbad-function-cast
24 EXTRA_WARNINGS += -Wdeclaration-after-statemen 24 EXTRA_WARNINGS += -Wdeclaration-after-statement
25 EXTRA_WARNINGS += -Wformat-security 25 EXTRA_WARNINGS += -Wformat-security
26 EXTRA_WARNINGS += -Wformat-y2k 26 EXTRA_WARNINGS += -Wformat-y2k
27 EXTRA_WARNINGS += -Winit-self 27 EXTRA_WARNINGS += -Winit-self
28 EXTRA_WARNINGS += -Wmissing-declarations 28 EXTRA_WARNINGS += -Wmissing-declarations
29 EXTRA_WARNINGS += -Wmissing-prototypes 29 EXTRA_WARNINGS += -Wmissing-prototypes
30 EXTRA_WARNINGS += -Wnested-externs 30 EXTRA_WARNINGS += -Wnested-externs
31 EXTRA_WARNINGS += -Wno-system-headers 31 EXTRA_WARNINGS += -Wno-system-headers
32 EXTRA_WARNINGS += -Wold-style-definition 32 EXTRA_WARNINGS += -Wold-style-definition
33 EXTRA_WARNINGS += -Wpacked 33 EXTRA_WARNINGS += -Wpacked
34 EXTRA_WARNINGS += -Wredundant-decls 34 EXTRA_WARNINGS += -Wredundant-decls
>> 35 EXTRA_WARNINGS += -Wshadow
35 EXTRA_WARNINGS += -Wstrict-prototypes 36 EXTRA_WARNINGS += -Wstrict-prototypes
36 EXTRA_WARNINGS += -Wswitch-default 37 EXTRA_WARNINGS += -Wswitch-default
37 EXTRA_WARNINGS += -Wswitch-enum 38 EXTRA_WARNINGS += -Wswitch-enum
38 EXTRA_WARNINGS += -Wundef 39 EXTRA_WARNINGS += -Wundef
39 EXTRA_WARNINGS += -Wwrite-strings 40 EXTRA_WARNINGS += -Wwrite-strings
40 EXTRA_WARNINGS += -Wformat 41 EXTRA_WARNINGS += -Wformat
41 EXTRA_WARNINGS += -Wno-type-limits !! 42
>> 43 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
42 44
43 # Makefiles suck: This macro sets a default va 45 # Makefiles suck: This macro sets a default value of $(2) for the
44 # variable named by $(1), unless the variable 46 # variable named by $(1), unless the variable has been set by
45 # environment or command line. This is necessa 47 # environment or command line. This is necessary for CC and AR
46 # because make sets default values, so the sim 48 # because make sets default values, so the simpler ?= approach
47 # won't work as expected. 49 # won't work as expected.
48 define allow-override 50 define allow-override
49 $(if $(or $(findstring environment,$(origin 51 $(if $(or $(findstring environment,$(origin $(1))),\
50 $(findstring command line,$(origin 52 $(findstring command line,$(origin $(1)))),,\
51 $(eval $(1) = $(2))) 53 $(eval $(1) = $(2)))
52 endef 54 endef
53 55
54 ifneq ($(LLVM),) <<
55 ifneq ($(filter %/,$(LLVM)),) <<
56 LLVM_PREFIX := $(LLVM) <<
57 else ifneq ($(filter -%,$(LLVM)),) <<
58 LLVM_SUFFIX := $(LLVM) <<
59 endif <<
60 <<
61 $(call allow-override,CC,$(LLVM_PREFIX)clang$( <<
62 $(call allow-override,AR,$(LLVM_PREFIX)llvm-ar <<
63 $(call allow-override,LD,$(LLVM_PREFIX)ld.lld$ <<
64 $(call allow-override,CXX,$(LLVM_PREFIX)clang+ <<
65 $(call allow-override,STRIP,$(LLVM_PREFIX)llvm <<
66 else <<
67 # Allow setting various cross-compile vars or 56 # Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
68 $(call allow-override,CC,$(CROSS_COMPILE)gcc) 57 $(call allow-override,CC,$(CROSS_COMPILE)gcc)
69 $(call allow-override,AR,$(CROSS_COMPILE)ar) 58 $(call allow-override,AR,$(CROSS_COMPILE)ar)
70 $(call allow-override,LD,$(CROSS_COMPILE)ld) 59 $(call allow-override,LD,$(CROSS_COMPILE)ld)
71 $(call allow-override,CXX,$(CROSS_COMPILE)g++) 60 $(call allow-override,CXX,$(CROSS_COMPILE)g++)
72 $(call allow-override,STRIP,$(CROSS_COMPILE)st 61 $(call allow-override,STRIP,$(CROSS_COMPILE)strip)
73 endif <<
74 <<
75 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/ <<
76 62
77 ifneq ($(LLVM),) 63 ifneq ($(LLVM),)
78 HOSTAR ?= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) !! 64 HOSTAR ?= llvm-ar
79 HOSTCC ?= $(LLVM_PREFIX)clang$(LLVM_SUFFIX) !! 65 HOSTCC ?= clang
80 HOSTLD ?= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) !! 66 HOSTLD ?= ld.lld
81 else 67 else
82 HOSTAR ?= ar 68 HOSTAR ?= ar
83 HOSTCC ?= gcc 69 HOSTCC ?= gcc
84 HOSTLD ?= ld 70 HOSTLD ?= ld
85 endif 71 endif
86 72
87 # Some tools require Clang, LLC and/or LLVM ut <<
88 CLANG ?= clang <<
89 LLC ?= llc <<
90 LLVM_CONFIG ?= llvm-config <<
91 LLVM_OBJCOPY ?= llvm-objcopy <<
92 LLVM_STRIP ?= llvm-strip <<
93 <<
94 ifeq ($(CC_NO_CLANG), 1) 73 ifeq ($(CC_NO_CLANG), 1)
95 EXTRA_WARNINGS += -Wstrict-aliasing=3 74 EXTRA_WARNINGS += -Wstrict-aliasing=3
96 !! 75 endif
97 else ifneq ($(CROSS_COMPILE),) <<
98 # Allow userspace to override CLANG_CROSS_FLAG <<
99 # sysroots and flags or to avoid the GCC call <<
100 ifeq ($(CLANG_CROSS_FLAGS),) <<
101 CLANG_CROSS_FLAGS := --target=$(notdir $(CROSS <<
102 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CRO <<
103 ifneq ($(GCC_TOOLCHAIN_DIR),) <<
104 CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_ <<
105 CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS <<
106 CLANG_CROSS_FLAGS += --gcc-toolchain=$(realpat <<
107 endif # GCC_TOOLCHAIN_DIR <<
108 endif # CLANG_CROSS_FLAGS <<
109 CFLAGS += $(CLANG_CROSS_FLAGS) <<
110 AFLAGS += $(CLANG_CROSS_FLAGS) <<
111 else <<
112 CLANG_CROSS_FLAGS := <<
113 endif # CROSS_COMPILE <<
114 76
115 # Hack to avoid type-punned warnings on old sy 77 # Hack to avoid type-punned warnings on old systems such as RHEL5:
116 # We should be changing CFLAGS and checking gc 78 # We should be changing CFLAGS and checking gcc version, but this
117 # will do for now and keep the above -Wstrict- 79 # will do for now and keep the above -Wstrict-aliasing=3 in place
118 # in newer systems. 80 # in newer systems.
119 # Needed for the __raw_cmpxchg in tools/arch/x 81 # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
120 # <<
121 # See https://lore.kernel.org/lkml/9a874849061 <<
122 # and https://gcc.gnu.org/gcc-4.8/changes.html <<
123 # that takes into account Linus's comments (se <<
124 # -Wshadow not being interesting before gcc 4. <<
125 <<
126 ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make 82 ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
127 EXTRA_WARNINGS += -fno-strict-aliasing 83 EXTRA_WARNINGS += -fno-strict-aliasing
128 EXTRA_WARNINGS += -Wno-shadow <<
129 else <<
130 EXTRA_WARNINGS += -Wshadow <<
131 endif 84 endif
132 85
133 ifneq ($(findstring $(MAKEFLAGS), w),w) 86 ifneq ($(findstring $(MAKEFLAGS), w),w)
134 PRINT_DIR = --no-print-directory 87 PRINT_DIR = --no-print-directory
135 else 88 else
136 NO_SUBDIR = : 89 NO_SUBDIR = :
137 endif 90 endif
138 91
139 # If the user is running make -s (silent mode) !! 92 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
140 # make-4.0 (and later) keep single letter opti <<
141 ifeq ($(filter 3.%,$(MAKE_VERSION)),) <<
142 short-opts := $(firstword -$(MAKEFLAGS)) <<
143 else <<
144 short-opts := $(filter-out --%,$(MAKEFLAGS)) <<
145 endif <<
146 <<
147 ifneq ($(findstring s,$(short-opts)),) <<
148 silent=1 93 silent=1
149 endif 94 endif
150 95
151 # 96 #
152 # Define a callable command for descending to 97 # Define a callable command for descending to a new directory
153 # 98 #
154 # Call by doing: $(call descend,directory[,tar 99 # Call by doing: $(call descend,directory[,target])
155 # 100 #
156 descend = \ 101 descend = \
157 +mkdir -p $(OUTPUT)$(1) && \ 102 +mkdir -p $(OUTPUT)$(1) && \
158 $(MAKE) $(COMMAND_O) subdir=$(if $(sub 103 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
159 104
160 QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # sp 105 QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
161 QUIET_SUBDIR1 = 106 QUIET_SUBDIR1 =
162 107
163 ifneq ($(silent),1) 108 ifneq ($(silent),1)
164 ifneq ($(V),1) 109 ifneq ($(V),1)
165 QUIET_CC = @echo ' CC '$@; !! 110 QUIET_CC = @echo ' CC '$@;
166 QUIET_CC_FPIC = @echo ' CC FPIC '$@; !! 111 QUIET_CC_FPIC = @echo ' CC FPIC '$@;
167 QUIET_CLANG = @echo ' CLANG '$@; !! 112 QUIET_AR = @echo ' AR '$@;
168 QUIET_AR = @echo ' AR '$@; !! 113 QUIET_LINK = @echo ' LINK '$@;
169 QUIET_LINK = @echo ' LINK '$@; !! 114 QUIET_MKDIR = @echo ' MKDIR '$@;
170 QUIET_MKDIR = @echo ' MKDIR '$@; !! 115 QUIET_GEN = @echo ' GEN '$@;
171 QUIET_GEN = @echo ' GEN '$@; <<
172 QUIET_SUBDIR0 = +@subdir= 116 QUIET_SUBDIR0 = +@subdir=
173 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ 117 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
174 echo ' SUBDIR '$$s !! 118 echo ' SUBDIR '$$subdir; \
175 $(MAKE) $(PRINT_DIR) 119 $(MAKE) $(PRINT_DIR) -C $$subdir
176 QUIET_FLEX = @echo ' FLEX '$@; !! 120 QUIET_FLEX = @echo ' FLEX '$@;
177 QUIET_BISON = @echo ' BISON '$@; !! 121 QUIET_BISON = @echo ' BISON '$@;
178 QUIET_GENSKEL = @echo ' GENSKEL '$@; <<
179 122
180 descend = \ 123 descend = \
181 +@echo ' DESCEND '$(1 !! 124 +@echo ' DESCEND '$(1); \
182 mkdir -p $(OUTPUT)$(1) && \ 125 mkdir -p $(OUTPUT)$(1) && \
183 $(MAKE) $(COMMAND_O) subdir=$( 126 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
184 127
185 QUIET_CLEAN = @printf ' CLEAN %s !! 128 QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
186 QUIET_INSTALL = @printf ' INSTALL %s !! 129 QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
187 QUIET_UNINST = @printf ' UNINST %s !! 130 QUIET_UNINST = @printf ' UNINST %s\n' $1;
188 endif 131 endif
189 endif 132 endif
190 133
191 pound := \# 134 pound := \#
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