1 # SPDX-License-Identifier: GPL-2.0
2 ifneq ($(O),)
3 ifeq ($(origin O), command line)
4 $(if $(shell cd $(PWD); test -d $(O) |
5 ABSOLUTE_O := $(shell cd $(PWD); cd $(
6 OUTPUT := $(ABSOLUTE_O)/$(if $(subdir)
7 COMMAND_O := O=$(ABSOLUTE_O)
8 ifeq ($(objtree),)
9 objtree := $(O)
10 endif
11 endif
12 endif
13
14 # check that the output directory actually exi
15 ifneq ($(OUTPUT),)
16 OUTDIR := $(shell cd $(OUTPUT) && pwd)
17 $(if $(OUTDIR),, $(error output directory "$(O
18 endif
19
20 #
21 # Include saner warnings here, which can catch
22 #
23 EXTRA_WARNINGS := -Wbad-function-cast
24 EXTRA_WARNINGS += -Wdeclaration-after-statemen
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 EXTRA_WARNINGS += -Wno-type-limits
42
43 # Makefiles suck: This macro sets a default va
44 # variable named by $(1), unless the variable
45 # environment or command line. This is necessa
46 # because make sets default values, so the sim
47 # won't work as expected.
48 define allow-override
49 $(if $(or $(findstring environment,$(origin
50 $(findstring command line,$(origin
51 $(eval $(1) = $(2)))
52 endef
53
54 ifneq ($(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
68 $(call allow-override,CC,$(CROSS_COMPILE)gcc)
69 $(call allow-override,AR,$(CROSS_COMPILE)ar)
70 $(call allow-override,LD,$(CROSS_COMPILE)ld)
71 $(call allow-override,CXX,$(CROSS_COMPILE)g++)
72 $(call allow-override,STRIP,$(CROSS_COMPILE)st
73 endif
74
75 CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/
76
77 ifneq ($(LLVM),)
78 HOSTAR ?= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
79 HOSTCC ?= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
80 HOSTLD ?= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
81 else
82 HOSTAR ?= ar
83 HOSTCC ?= gcc
84 HOSTLD ?= ld
85 endif
86
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 ($(CC_NO_CLANG), 1)
95 EXTRA_WARNINGS += -Wstrict-aliasing=3
96
97 else ifneq ($(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 += $(CLANG_CROSS_FLAGS)
111 else
112 CLANG_CROSS_FLAGS :=
113 endif # CROSS_COMPILE
114
115 # Hack to avoid type-punned warnings on old sy
116 # We should be changing CFLAGS and checking gc
117 # will do for now and keep the above -Wstrict-
118 # in newer systems.
119 # Needed for the __raw_cmpxchg in tools/arch/x
120 #
121 # See https://lore.kernel.org/lkml/9a874849061
122 # and https://gcc.gnu.org/gcc-4.8/changes.html
123 # that takes into account Linus's comments (se
124 # -Wshadow not being interesting before gcc 4.
125
126 ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make
127 EXTRA_WARNINGS += -fno-strict-aliasing
128 EXTRA_WARNINGS += -Wno-shadow
129 else
130 EXTRA_WARNINGS += -Wshadow
131 endif
132
133 ifneq ($(findstring $(MAKEFLAGS), w),w)
134 PRINT_DIR = --no-print-directory
135 else
136 NO_SUBDIR = :
137 endif
138
139 # If the user is running make -s (silent mode)
140 # make-4.0 (and later) keep single letter opti
141 ifeq ($(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
149 endif
150
151 #
152 # Define a callable command for descending to
153 #
154 # Call by doing: $(call descend,directory[,tar
155 #
156 descend = \
157 +mkdir -p $(OUTPUT)$(1) && \
158 $(MAKE) $(COMMAND_O) subdir=$(if $(sub
159
160 QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # sp
161 QUIET_SUBDIR1 =
162
163 ifneq ($(silent),1)
164 ifneq ($(V),1)
165 QUIET_CC = @echo ' CC '$@;
166 QUIET_CC_FPIC = @echo ' CC FPIC '$@;
167 QUIET_CLANG = @echo ' CLANG '$@;
168 QUIET_AR = @echo ' AR '$@;
169 QUIET_LINK = @echo ' LINK '$@;
170 QUIET_MKDIR = @echo ' MKDIR '$@;
171 QUIET_GEN = @echo ' GEN '$@;
172 QUIET_SUBDIR0 = +@subdir=
173 QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
174 echo ' SUBDIR '$$s
175 $(MAKE) $(PRINT_DIR)
176 QUIET_FLEX = @echo ' FLEX '$@;
177 QUIET_BISON = @echo ' BISON '$@;
178 QUIET_GENSKEL = @echo ' GENSKEL '$@;
179
180 descend = \
181 +@echo ' DESCEND '$(1
182 mkdir -p $(OUTPUT)$(1) && \
183 $(MAKE) $(COMMAND_O) subdir=$(
184
185 QUIET_CLEAN = @printf ' CLEAN %s
186 QUIET_INSTALL = @printf ' INSTALL %s
187 QUIET_UNINST = @printf ' UNINST %s
188 endif
189 endif
190
191 pound := \#
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