summaryrefslogtreecommitdiffstats
path: root/tools/scripts/Makefile.include
blob: ff527ac065cf8b2b5ce99a70c4d6b3969c07ba64 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
# SPDX-License-Identifier: GPL-2.0
ifneq ($(O),)
ifeq ($(origin O), command line)
	dummy := $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
	ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd)
	OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
	COMMAND_O := O=$(ABSOLUTE_O)
ifeq ($(objtree),)
	objtree := $(O)
endif
endif
endif

# check that the output directory actually exists
ifneq ($(OUTPUT),)
OUTDIR := $(shell cd $(OUTPUT) && pwd)
$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
endif

#
# Include saner warnings here, which can catch bugs:
#
EXTRA_WARNINGS := -Wbad-function-cast
EXTRA_WARNINGS += -Wdeclaration-after-statement
EXTRA_WARNINGS += -Wformat-security
EXTRA_WARNINGS += -Wformat-y2k
EXTRA_WARNINGS += -Winit-self
EXTRA_WARNINGS += -Wmissing-declarations
EXTRA_WARNINGS += -Wmissing-prototypes
EXTRA_WARNINGS += -Wnested-externs
EXTRA_WARNINGS += -Wno-system-headers
EXTRA_WARNINGS += -Wold-style-definition
EXTRA_WARNINGS += -Wpacked
EXTRA_WARNINGS += -Wredundant-decls
EXTRA_WARNINGS += -Wstrict-prototypes
EXTRA_WARNINGS += -Wswitch-default
EXTRA_WARNINGS += -Wswitch-enum
EXTRA_WARNINGS += -Wundef
EXTRA_WARNINGS += -Wwrite-strings
EXTRA_WARNINGS += -Wformat
EXTRA_WARNINGS += -Wno-type-limits

# Makefiles suck: This macro sets a default value of $(2) for the
# variable named by $(1), unless the variable has been set by
# environment or command line. This is necessary for CC and AR
# because make sets default values, so the simpler ?= approach
# won't work as expected.
define allow-override
  $(if $(or $(findstring environment,$(origin $(1))),\
            $(findstring command line,$(origin $(1)))),,\
    $(eval $(1) = $(2)))
endef

ifneq ($(LLVM),)
ifneq ($(filter %/,$(LLVM)),)
LLVM_PREFIX := $(LLVM)
else ifneq ($(filter -%,$(LLVM)),)
LLVM_SUFFIX := $(LLVM)
endif

$(call allow-override,CC,$(LLVM_PREFIX)clang$(LLVM_SUFFIX))
$(call allow-override,AR,$(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX))
$(call allow-override,LD,$(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX))
$(call allow-override,CXX,$(LLVM_PREFIX)clang++$(LLVM_SUFFIX))
$(call allow-override,STRIP,$(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX))
else
# Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
$(call allow-override,CC,$(CROSS_COMPILE)gcc)
$(call allow-override,AR,$(CROSS_COMPILE)ar)
$(call allow-override,LD,$(CROSS_COMPILE)ld)
$(call allow-override,CXX,$(CROSS_COMPILE)g++)
$(call allow-override,STRIP,$(CROSS_COMPILE)strip)
endif

CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)

ifneq ($(LLVM),)
HOSTAR  ?= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
HOSTCC  ?= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
HOSTLD  ?= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
else
HOSTAR  ?= ar
HOSTCC  ?= gcc
HOSTLD  ?= ld
endif

# Some tools require Clang, LLC and/or LLVM utils
CLANG		?= clang
LLC		?= llc
LLVM_CONFIG	?= llvm-config
LLVM_OBJCOPY	?= llvm-objcopy
LLVM_STRIP	?= llvm-strip

ifeq ($(CC_NO_CLANG), 1)
EXTRA_WARNINGS += -Wstrict-aliasing=3

else ifneq ($(CROSS_COMPILE),)
# Allow userspace to override CLANG_CROSS_FLAGS to specify their own
# sysroots and flags or to avoid the GCC call in pure Clang builds.
ifeq ($(CLANG_CROSS_FLAGS),)
CLANG_CROSS_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)gcc 2>/dev/null))
ifneq ($(GCC_TOOLCHAIN_DIR),)
CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS_COMPILE)gcc -print-sysroot)
CLANG_CROSS_FLAGS += --gcc-toolchain=$(realpath $(GCC_TOOLCHAIN_DIR)/..)
endif # GCC_TOOLCHAIN_DIR
endif # CLANG_CROSS_FLAGS
CFLAGS += $(CLANG_CROSS_FLAGS)
AFLAGS += $(CLANG_CROSS_FLAGS)
else
CLANG_CROSS_FLAGS :=
endif # CROSS_COMPILE

# Hack to avoid type-punned warnings on old systems such as RHEL5:
# We should be changing CFLAGS and checking gcc version, but this
# will do for now and keep the above -Wstrict-aliasing=3 in place
# in newer systems.
# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
#
# See https://lore.kernel.org/lkml/9a8748490611281710g78402fbeh8ff7fcc162dbcbca@mail.gmail.com/
# and https://gcc.gnu.org/gcc-4.8/changes.html,
# that takes into account Linus's comments (search for Wshadow) for the reasoning about
# -Wshadow not being interesting before gcc 4.8.

ifneq ($(filter 3.%,$(MAKE_VERSION)),)  # make-3
EXTRA_WARNINGS += -fno-strict-aliasing
EXTRA_WARNINGS += -Wno-shadow
else
EXTRA_WARNINGS += -Wshadow
endif

ifneq ($(findstring $(MAKEFLAGS), w),w)
PRINT_DIR = --no-print-directory
else
NO_SUBDIR = :
endif

ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  silent=1
endif

#
# Define a callable command for descending to a new directory
#
# Call by doing: $(call descend,directory[,target])
#
descend = \
	+mkdir -p $(OUTPUT)$(1) && \
	$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)

QUIET_SUBDIR0  = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
QUIET_SUBDIR1  =

ifneq ($(silent),1)
  ifneq ($(V),1)
	QUIET_CC       = @echo '  CC      '$@;
	QUIET_CC_FPIC  = @echo '  CC FPIC '$@;
	QUIET_CLANG    = @echo '  CLANG   '$@;
	QUIET_AR       = @echo '  AR      '$@;
	QUIET_LINK     = @echo '  LINK    '$@;
	QUIET_MKDIR    = @echo '  MKDIR   '$@;
	QUIET_GEN      = @echo '  GEN     '$@;
	QUIET_SUBDIR0  = +@subdir=
	QUIET_SUBDIR1  = ;$(NO_SUBDIR) \
			  echo '  SUBDIR  '$$subdir; \
			 $(MAKE) $(PRINT_DIR) -C $$subdir
	QUIET_FLEX     = @echo '  FLEX    '$@;
	QUIET_BISON    = @echo '  BISON   '$@;
	QUIET_GENSKEL  = @echo '  GENSKEL '$@;

	descend = \
		+@echo	       '  DESCEND '$(1); \
		mkdir -p $(OUTPUT)$(1) && \
		$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)

	QUIET_CLEAN    = @printf '  CLEAN   %s\n' $1;
	QUIET_INSTALL  = @printf '  INSTALL %s\n' $1;
	QUIET_UNINST   = @printf '  UNINST  %s\n' $1;
  endif
endif

pound := \#