x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments
[muen/linux.git] / scripts / Makefile.extrawarn
1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
3 # make W=... settings
4 #
5 # There are four warning groups enabled by W=1, W=2, W=3, and W=e
6 # They are independent, and can be combined like W=12 or W=123e.
7 # ==========================================================================
8
9 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
10
11 # backward compatibility
12 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
13
14 ifeq ("$(origin W)", "command line")
15   KBUILD_EXTRA_WARN := $(W)
16 endif
17
18 export KBUILD_EXTRA_WARN
19
20 #
21 # W=1 - warnings which may be relevant and do not occur too often
22 #
23 ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
24
25 KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter
26 KBUILD_CFLAGS += -Wmissing-declarations
27 KBUILD_CFLAGS += -Wmissing-format-attribute
28 KBUILD_CFLAGS += -Wmissing-prototypes
29 KBUILD_CFLAGS += -Wold-style-definition
30 KBUILD_CFLAGS += -Wmissing-include-dirs
31 KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable)
32 KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
33 KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned)
34 KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
35 # The following turn off the warnings enabled by -Wextra
36 KBUILD_CFLAGS += -Wno-missing-field-initializers
37 KBUILD_CFLAGS += -Wno-sign-compare
38 KBUILD_CFLAGS += -Wno-type-limits
39 KBUILD_CFLAGS += -Wno-shift-negative-value
40
41 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
42
43 else
44
45 # Some diagnostics enabled by default are noisy.
46 # Suppress them by using -Wno... except for W=1.
47
48 ifdef CONFIG_CC_IS_CLANG
49 KBUILD_CFLAGS += -Wno-initializer-overrides
50 KBUILD_CFLAGS += -Wno-sign-compare
51 KBUILD_CFLAGS += -Wno-format-zero-length
52 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
53 KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare
54 KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access)
55 endif
56
57 endif
58
59 #
60 # W=2 - warnings which occur quite often but may still be relevant
61 #
62 ifneq ($(findstring 2, $(KBUILD_EXTRA_WARN)),)
63
64 KBUILD_CFLAGS += -Wdisabled-optimization
65 KBUILD_CFLAGS += -Wshadow
66 KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
67 KBUILD_CFLAGS += -Wmissing-field-initializers
68 KBUILD_CFLAGS += -Wtype-limits
69 KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
70 KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
71
72 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
73
74 endif
75
76 #
77 # W=3 - more obscure warnings, can most likely be ignored
78 #
79 ifneq ($(findstring 3, $(KBUILD_EXTRA_WARN)),)
80
81 KBUILD_CFLAGS += -Wbad-function-cast
82 KBUILD_CFLAGS += -Wcast-align
83 KBUILD_CFLAGS += -Wcast-qual
84 KBUILD_CFLAGS += -Wconversion
85 KBUILD_CFLAGS += -Wpacked
86 KBUILD_CFLAGS += -Wpadded
87 KBUILD_CFLAGS += -Wpointer-arith
88 KBUILD_CFLAGS += -Wredundant-decls
89 KBUILD_CFLAGS += -Wsign-compare
90 KBUILD_CFLAGS += -Wswitch-default
91 KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat)
92
93 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3
94
95 endif
96
97 #
98 # W=e - error out on warnings
99 #
100 ifneq ($(findstring e, $(KBUILD_EXTRA_WARN)),)
101
102 KBUILD_CFLAGS += -Werror
103
104 endif