Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
9e4a6648 | 2 | ifneq ($(O),) |
bf35182f | 3 | ifeq ($(origin O), command line) |
be40920f MH |
4 | dummy := $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),) |
5 | ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd) | |
bf35182f | 6 | OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/) |
c883122a | 7 | COMMAND_O := O=$(ABSOLUTE_O) |
bf35182f DH |
8 | ifeq ($(objtree),) |
9 | objtree := $(O) | |
10 | endif | |
98d89bfd | 11 | endif |
9e4a6648 | 12 | endif |
98d89bfd | 13 | |
98d89bfd | 14 | # check that the output directory actually exists |
9e4a6648 | 15 | ifneq ($(OUTPUT),) |
16f8259c | 16 | OUTDIR := $(shell cd $(OUTPUT) && pwd) |
98d89bfd BP |
17 | $(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist)) |
18 | endif | |
19 | ||
20 | # | |
21 | # Include saner warnings here, which can catch bugs: | |
22 | # | |
d8caf3eb BP |
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 | |
d8caf3eb BP |
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 | |
d1d1a2cd | 41 | EXTRA_WARNINGS += -Wno-type-limits |
98d89bfd | 42 | |
7ed1c190 MK |
43 | # Makefiles suck: This macro sets a default value of $(2) for the |
44 | # variable named by $(1), unless the variable has been set by | |
45 | # environment or command line. This is necessary for CC and AR | |
46 | # because make sets default values, so the simpler ?= approach | |
47 | # won't work as expected. | |
48 | define allow-override | |
49 | $(if $(or $(findstring environment,$(origin $(1))),\ | |
50 | $(findstring command line,$(origin $(1)))),,\ | |
51 | $(eval $(1) = $(2))) | |
52 | endef | |
53 | ||
f62700ce | 54 | ifneq ($(LLVM),) |
e9c28192 NC |
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$(LLVM_SUFFIX)) | |
62 | $(call allow-override,AR,$(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)) | |
63 | $(call allow-override,LD,$(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)) | |
64 | $(call allow-override,CXX,$(LLVM_PREFIX)clang++$(LLVM_SUFFIX)) | |
65 | $(call allow-override,STRIP,$(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)) | |
f62700ce | 66 | else |
7ed1c190 MK |
67 | # Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix. |
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)strip) | |
f62700ce YS |
73 | endif |
74 | ||
75 | CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?) | |
7ed1c190 | 76 | |
c8a950d0 | 77 | ifneq ($(LLVM),) |
e9c28192 NC |
78 | HOSTAR ?= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) |
79 | HOSTCC ?= $(LLVM_PREFIX)clang$(LLVM_SUFFIX) | |
80 | HOSTLD ?= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) | |
c8a950d0 JPB |
81 | else |
82 | HOSTAR ?= ar | |
83 | HOSTCC ?= gcc | |
84 | HOSTLD ?= ld | |
85 | endif | |
86 | ||
211a741c SD |
87 | # Some tools require Clang, LLC and/or LLVM utils |
88 | CLANG ?= clang | |
89 | LLC ?= llc | |
90 | LLVM_CONFIG ?= llvm-config | |
91 | LLVM_OBJCOPY ?= llvm-objcopy | |
92 | LLVM_STRIP ?= llvm-strip | |
93 | ||
3866058e | 94 | ifeq ($(CC_NO_CLANG), 1) |
093b75ef | 95 | EXTRA_WARNINGS += -Wstrict-aliasing=3 |
cebdb737 JPB |
96 | |
97 | else ifneq ($(CROSS_COMPILE),) | |
7fd9fd46 AR |
98 | # Allow userspace to override CLANG_CROSS_FLAGS to specify their own |
99 | # sysroots and flags or to avoid the GCC call in pure Clang builds. | |
100 | ifeq ($(CLANG_CROSS_FLAGS),) | |
cebdb737 | 101 | CLANG_CROSS_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%)) |
b7892f7d | 102 | GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)gcc 2>/dev/null)) |
cebdb737 JPB |
103 | ifneq ($(GCC_TOOLCHAIN_DIR),) |
104 | CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) | |
105 | CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS_COMPILE)gcc -print-sysroot) | |
106 | CLANG_CROSS_FLAGS += --gcc-toolchain=$(realpath $(GCC_TOOLCHAIN_DIR)/..) | |
107 | endif # GCC_TOOLCHAIN_DIR | |
7fd9fd46 | 108 | endif # CLANG_CROSS_FLAGS |
cebdb737 JPB |
109 | CFLAGS += $(CLANG_CROSS_FLAGS) |
110 | AFLAGS += $(CLANG_CROSS_FLAGS) | |
111 | endif # CROSS_COMPILE | |
093b75ef | 112 | |
3337e682 ACM |
113 | # Hack to avoid type-punned warnings on old systems such as RHEL5: |
114 | # We should be changing CFLAGS and checking gcc version, but this | |
115 | # will do for now and keep the above -Wstrict-aliasing=3 in place | |
116 | # in newer systems. | |
117 | # Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h | |
39e7317e | 118 | # |
c9491aad KC |
119 | # See https://lore.kernel.org/lkml/9a8748490611281710g78402fbeh8ff7fcc162dbcbca@mail.gmail.com/ |
120 | # and https://gcc.gnu.org/gcc-4.8/changes.html, | |
39e7317e ACM |
121 | # that takes into account Linus's comments (search for Wshadow) for the reasoning about |
122 | # -Wshadow not being interesting before gcc 4.8. | |
123 | ||
3337e682 ACM |
124 | ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3 |
125 | EXTRA_WARNINGS += -fno-strict-aliasing | |
39e7317e ACM |
126 | EXTRA_WARNINGS += -Wno-shadow |
127 | else | |
128 | EXTRA_WARNINGS += -Wshadow | |
3337e682 ACM |
129 | endif |
130 | ||
98d89bfd BP |
131 | ifneq ($(findstring $(MAKEFLAGS), w),w) |
132 | PRINT_DIR = --no-print-directory | |
133 | else | |
134 | NO_SUBDIR = : | |
135 | endif | |
136 | ||
6f0fa58e | 137 | ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) |
e572d088 JP |
138 | silent=1 |
139 | endif | |
e572d088 | 140 | |
ca9dfc6c DH |
141 | # |
142 | # Define a callable command for descending to a new directory | |
143 | # | |
144 | # Call by doing: $(call descend,directory[,target]) | |
145 | # | |
146 | descend = \ | |
bf35182f | 147 | +mkdir -p $(OUTPUT)$(1) && \ |
2b73f65d | 148 | $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) |
ca9dfc6c | 149 | |
bf35182f | 150 | QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir |
98d89bfd BP |
151 | QUIET_SUBDIR1 = |
152 | ||
e572d088 | 153 | ifneq ($(silent),1) |
65fb0992 | 154 | ifneq ($(V),1) |
c6de37dd KC |
155 | QUIET_CC = @echo ' CC '$@; |
156 | QUIET_CC_FPIC = @echo ' CC FPIC '$@; | |
157 | QUIET_CLANG = @echo ' CLANG '$@; | |
158 | QUIET_AR = @echo ' AR '$@; | |
159 | QUIET_LINK = @echo ' LINK '$@; | |
160 | QUIET_MKDIR = @echo ' MKDIR '$@; | |
161 | QUIET_GEN = @echo ' GEN '$@; | |
98d89bfd | 162 | QUIET_SUBDIR0 = +@subdir= |
65fb0992 | 163 | QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ |
c6de37dd | 164 | echo ' SUBDIR '$$subdir; \ |
98d89bfd | 165 | $(MAKE) $(PRINT_DIR) -C $$subdir |
c6de37dd KC |
166 | QUIET_FLEX = @echo ' FLEX '$@; |
167 | QUIET_BISON = @echo ' BISON '$@; | |
168 | QUIET_GENSKEL = @echo ' GENSKEL '$@; | |
bf35182f DH |
169 | |
170 | descend = \ | |
c6de37dd | 171 | +@echo ' DESCEND '$(1); \ |
bf35182f | 172 | mkdir -p $(OUTPUT)$(1) && \ |
2b73f65d | 173 | $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2) |
b7248def | 174 | |
c6de37dd KC |
175 | QUIET_CLEAN = @printf ' CLEAN %s\n' $1; |
176 | QUIET_INSTALL = @printf ' INSTALL %s\n' $1; | |
177 | QUIET_UNINST = @printf ' UNINST %s\n' $1; | |
65fb0992 | 178 | endif |
98d89bfd | 179 | endif |
9564a8cf RV |
180 | |
181 | pound := \# |