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 += -Wstrict-prototypes 35 EXTRA_WARNINGS += -Wstrict-prototypes
36 EXTRA_WARNINGS += -Wswitch-default 36 EXTRA_WARNINGS += -Wswitch-default
37 EXTRA_WARNINGS += -Wswitch-enum 37 EXTRA_WARNINGS += -Wswitch-enum
38 EXTRA_WARNINGS += -Wundef 38 EXTRA_WARNINGS += -Wundef
39 EXTRA_WARNINGS += -Wwrite-strings 39 EXTRA_WARNINGS += -Wwrite-strings
40 EXTRA_WARNINGS += -Wformat 40 EXTRA_WARNINGS += -Wformat
41 EXTRA_WARNINGS += -Wno-type-limits 41 EXTRA_WARNINGS += -Wno-type-limits
42 42
43 # Makefiles suck: This macro sets a default va 43 # Makefiles suck: This macro sets a default value of $(2) for the
44 # variable named by $(1), unless the variable 44 # variable named by $(1), unless the variable has been set by
45 # environment or command line. This is necessa 45 # environment or command line. This is necessary for CC and AR
46 # because make sets default values, so the sim 46 # because make sets default values, so the simpler ?= approach
47 # won't work as expected. 47 # won't work as expected.
48 define allow-override 48 define allow-override
49 $(if $(or $(findstring environment,$(origin 49 $(if $(or $(findstring environment,$(origin $(1))),\
50 $(findstring command line,$(origin 50 $(findstring command line,$(origin $(1)))),,\
51 $(eval $(1) = $(2))) 51 $(eval $(1) = $(2)))
52 endef 52 endef
53 53
54 ifneq ($(LLVM),) 54 ifneq ($(LLVM),)
55 ifneq ($(filter %/,$(LLVM)),) 55 ifneq ($(filter %/,$(LLVM)),)
56 LLVM_PREFIX := $(LLVM) 56 LLVM_PREFIX := $(LLVM)
57 else ifneq ($(filter -%,$(LLVM)),) 57 else ifneq ($(filter -%,$(LLVM)),)
58 LLVM_SUFFIX := $(LLVM) 58 LLVM_SUFFIX := $(LLVM)
59 endif 59 endif
60 60
61 $(call allow-override,CC,$(LLVM_PREFIX)clang$( 61 $(call allow-override,CC,$(LLVM_PREFIX)clang$(LLVM_SUFFIX))
62 $(call allow-override,AR,$(LLVM_PREFIX)llvm-ar 62 $(call allow-override,AR,$(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX))
63 $(call allow-override,LD,$(LLVM_PREFIX)ld.lld$ 63 $(call allow-override,LD,$(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX))
64 $(call allow-override,CXX,$(LLVM_PREFIX)clang+ 64 $(call allow-override,CXX,$(LLVM_PREFIX)clang++$(LLVM_SUFFIX))
65 $(call allow-override,STRIP,$(LLVM_PREFIX)llvm 65 $(call allow-override,STRIP,$(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX))
66 else 66 else
67 # Allow setting various cross-compile vars or 67 # Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
68 $(call allow-override,CC,$(CROSS_COMPILE)gcc) 68 $(call allow-override,CC,$(CROSS_COMPILE)gcc)
69 $(call allow-override,AR,$(CROSS_COMPILE)ar) 69 $(call allow-override,AR,$(CROSS_COMPILE)ar)
70 $(call allow-override,LD,$(CROSS_COMPILE)ld) 70 $(call allow-override,LD,$(CROSS_COMPILE)ld)
71 $(call allow-override,CXX,$(CROSS_COMPILE)g++) 71 $(call allow-override,CXX,$(CROSS_COMPILE)g++)
72 $(call allow-override,STRIP,$(CROSS_COMPILE)st 72 $(call allow-override,STRIP,$(CROSS_COMPILE)strip)
73 endif 73 endif
74 74
75 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/ 75 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
76 76
77 ifneq ($(LLVM),) 77 ifneq ($(LLVM),)
78 HOSTAR ?= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) 78 HOSTAR ?= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
79 HOSTCC ?= $(LLVM_PREFIX)clang$(LLVM_SUFFIX) 79 HOSTCC ?= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
80 HOSTLD ?= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) 80 HOSTLD ?= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
81 else 81 else
82 HOSTAR ?= ar 82 HOSTAR ?= ar
83 HOSTCC ?= gcc 83 HOSTCC ?= gcc
84 HOSTLD ?= ld 84 HOSTLD ?= ld
85 endif 85 endif
86 86
87 # Some tools require Clang, LLC and/or LLVM ut 87 # Some tools require Clang, LLC and/or LLVM utils
88 CLANG ?= clang 88 CLANG ?= clang
89 LLC ?= llc 89 LLC ?= llc
90 LLVM_CONFIG ?= llvm-config 90 LLVM_CONFIG ?= llvm-config
91 LLVM_OBJCOPY ?= llvm-objcopy 91 LLVM_OBJCOPY ?= llvm-objcopy
92 LLVM_STRIP ?= llvm-strip 92 LLVM_STRIP ?= llvm-strip
93 93
94 ifeq ($(CC_NO_CLANG), 1) 94 ifeq ($(CC_NO_CLANG), 1)
95 EXTRA_WARNINGS += -Wstrict-aliasing=3 95 EXTRA_WARNINGS += -Wstrict-aliasing=3
96 96
97 else ifneq ($(CROSS_COMPILE),) 97 else ifneq ($(CROSS_COMPILE),)
98 # Allow userspace to override CLANG_CROSS_FLAG 98 # Allow userspace to override CLANG_CROSS_FLAGS to specify their own
99 # sysroots and flags or to avoid the GCC call 99 # sysroots and flags or to avoid the GCC call in pure Clang builds.
100 ifeq ($(CLANG_CROSS_FLAGS),) 100 ifeq ($(CLANG_CROSS_FLAGS),)
101 CLANG_CROSS_FLAGS := --target=$(notdir $(CROSS 101 CLANG_CROSS_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
102 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CRO 102 GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)gcc 2>/dev/null))
103 ifneq ($(GCC_TOOLCHAIN_DIR),) 103 ifneq ($(GCC_TOOLCHAIN_DIR),)
104 CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_ 104 CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
105 CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS 105 CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS_COMPILE)gcc -print-sysroot)
106 CLANG_CROSS_FLAGS += --gcc-toolchain=$(realpat 106 CLANG_CROSS_FLAGS += --gcc-toolchain=$(realpath $(GCC_TOOLCHAIN_DIR)/..)
107 endif # GCC_TOOLCHAIN_DIR 107 endif # GCC_TOOLCHAIN_DIR
108 endif # CLANG_CROSS_FLAGS 108 endif # CLANG_CROSS_FLAGS
109 CFLAGS += $(CLANG_CROSS_FLAGS) 109 CFLAGS += $(CLANG_CROSS_FLAGS)
110 AFLAGS += $(CLANG_CROSS_FLAGS) 110 AFLAGS += $(CLANG_CROSS_FLAGS)
111 else 111 else
112 CLANG_CROSS_FLAGS := 112 CLANG_CROSS_FLAGS :=
113 endif # CROSS_COMPILE 113 endif # CROSS_COMPILE
114 114
115 # Hack to avoid type-punned warnings on old sy 115 # Hack to avoid type-punned warnings on old systems such as RHEL5:
116 # We should be changing CFLAGS and checking gc 116 # We should be changing CFLAGS and checking gcc version, but this
117 # will do for now and keep the above -Wstrict- 117 # will do for now and keep the above -Wstrict-aliasing=3 in place
118 # in newer systems. 118 # in newer systems.
119 # Needed for the __raw_cmpxchg in tools/arch/x 119 # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
120 # 120 #
121 # See https://lore.kernel.org/lkml/9a874849061 121 # See https://lore.kernel.org/lkml/9a8748490611281710g78402fbeh8ff7fcc162dbcbca@mail.gmail.com/
122 # and https://gcc.gnu.org/gcc-4.8/changes.html 122 # and https://gcc.gnu.org/gcc-4.8/changes.html,
123 # that takes into account Linus's comments (se 123 # that takes into account Linus's comments (search for Wshadow) for the reasoning about
124 # -Wshadow not being interesting before gcc 4. 124 # -Wshadow not being interesting before gcc 4.8.
125 125
126 ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make 126 ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
127 EXTRA_WARNINGS += -fno-strict-aliasing 127 EXTRA_WARNINGS += -fno-strict-aliasing
128 EXTRA_WARNINGS += -Wno-shadow 128 EXTRA_WARNINGS += -Wno-shadow
129 else 129 else
130 EXTRA_WARNINGS += -Wshadow 130 EXTRA_WARNINGS += -Wshadow
131 endif 131 endif
132 132
133 ifneq ($(findstring $(MAKEFLAGS), w),w) 133 ifneq ($(findstring $(MAKEFLAGS), w),w)
134 PRINT_DIR = --no-print-directory 134 PRINT_DIR = --no-print-directory
135 else 135 else
136 NO_SUBDIR = : 136 NO_SUBDIR = :
137 endif 137 endif
138 138
139 # If the user is running make -s (silent mode) 139 # If the user is running make -s (silent mode), suppress echoing of commands
140 # make-4.0 (and later) keep single letter opti 140 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
141 ifeq ($(filter 3.%,$(MAKE_VERSION)),) 141 ifeq ($(filter 3.%,$(MAKE_VERSION)),)
142 short-opts := $(firstword -$(MAKEFLAGS)) 142 short-opts := $(firstword -$(MAKEFLAGS))
143 else 143 else
144 short-opts := $(filter-out --%,$(MAKEFLAGS)) 144 short-opts := $(filter-out --%,$(MAKEFLAGS))
145 endif 145 endif
146 146
147 ifneq ($(findstring s,$(short-opts)),) 147 ifneq ($(findstring s,$(short-opts)),)
148 silent=1 148 silent=1
149 endif 149 endif
150 150
151 # 151 #
152 # Define a callable command for descending to 152 # Define a callable command for descending to a new directory
153 # 153 #
154 # Call by doing: $(call descend,directory[,tar 154 # Call by doing: $(call descend,directory[,target])
155 # 155 #
156 descend = \ 156 descend = \
157 +mkdir -p $(OUTPUT)$(1) && \ 157 +mkdir -p $(OUTPUT)$(1) && \
158 $(MAKE) $(COMMAND_O) subdir=$(if $(sub 158 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
159 159
160 QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # sp 160 QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
161 QUIET_SUBDIR1 = 161 QUIET_SUBDIR1 =
162 162
163 ifneq ($(silent),1) 163 ifneq ($(silent),1)
164 ifneq ($(V),1) 164 ifneq ($(V),1)
165 QUIET_CC = @echo ' CC '$@; 165 QUIET_CC = @echo ' CC '$@;
166 QUIET_CC_FPIC = @echo ' CC FPIC '$@; 166 QUIET_CC_FPIC = @echo ' CC FPIC '$@;
167 QUIET_CLANG = @echo ' CLANG '$@; 167 QUIET_CLANG = @echo ' CLANG '$@;
168 QUIET_AR = @echo ' AR '$@; 168 QUIET_AR = @echo ' AR '$@;
169 QUIET_LINK = @echo ' LINK '$@; 169 QUIET_LINK = @echo ' LINK '$@;
170 QUIET_MKDIR = @echo ' MKDIR '$@; 170 QUIET_MKDIR = @echo ' MKDIR '$@;
171 QUIET_GEN = @echo ' GEN '$@; 171 QUIET_GEN = @echo ' GEN '$@;
172 QUIET_SUBDIR0 = +@subdir= 172 QUIET_SUBDIR0 = +@subdir=
173 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ 173 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
174 echo ' SUBDIR '$$s 174 echo ' SUBDIR '$$subdir; \
175 $(MAKE) $(PRINT_DIR) 175 $(MAKE) $(PRINT_DIR) -C $$subdir
176 QUIET_FLEX = @echo ' FLEX '$@; 176 QUIET_FLEX = @echo ' FLEX '$@;
177 QUIET_BISON = @echo ' BISON '$@; 177 QUIET_BISON = @echo ' BISON '$@;
178 QUIET_GENSKEL = @echo ' GENSKEL '$@; 178 QUIET_GENSKEL = @echo ' GENSKEL '$@;
179 179
180 descend = \ 180 descend = \
181 +@echo ' DESCEND '$(1 181 +@echo ' DESCEND '$(1); \
182 mkdir -p $(OUTPUT)$(1) && \ 182 mkdir -p $(OUTPUT)$(1) && \
183 $(MAKE) $(COMMAND_O) subdir=$( 183 $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
184 184
185 QUIET_CLEAN = @printf ' CLEAN %s 185 QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
186 QUIET_INSTALL = @printf ' INSTALL %s 186 QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
187 QUIET_UNINST = @printf ' UNINST %s 187 QUIET_UNINST = @printf ' UNINST %s\n' $1;
188 endif 188 endif
189 endif 189 endif
190 190
191 pound := \# 191 pound := \#
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