24b2fb1d12974d1507705f475b52aedc81c9be5c
[muen/linux.git] / scripts / Makefile.extrawarn
1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
3 #
4 # make W=... settings
5 #
6 # W=1 - warnings that may be relevant and does not occur too often
7 # W=2 - warnings that occur quite often but may still be relevant
8 # W=3 - the more obscure warnings, can most likely be ignored
9 #
10 # $(call cc-option, -W...) handles gcc -W.. options which
11 # are not supported by all versions of the compiler
12 # ==========================================================================
13
14 KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
15
16 ifeq ("$(origin W)", "command line")
17   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
18 endif
19
20 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
21 warning-  := $(empty)
22
23 warning-1 := -Wextra -Wunused -Wno-unused-parameter
24 warning-1 += -Wmissing-declarations
25 warning-1 += -Wmissing-format-attribute
26 warning-1 += $(call cc-option, -Wmissing-prototypes)
27 warning-1 += -Wold-style-definition
28 warning-1 += $(call cc-option, -Wmissing-include-dirs)
29 warning-1 += $(call cc-option, -Wunused-but-set-variable)
30 warning-1 += $(call cc-option, -Wunused-const-variable)
31 warning-1 += $(call cc-option, -Wpacked-not-aligned)
32 warning-1 += $(call cc-disable-warning, missing-field-initializers)
33 warning-1 += $(call cc-disable-warning, sign-compare)
34
35 warning-2 := -Waggregate-return
36 warning-2 += -Wcast-align
37 warning-2 += -Wdisabled-optimization
38 warning-2 += -Wnested-externs
39 warning-2 += -Wshadow
40 warning-2 += $(call cc-option, -Wlogical-op)
41 warning-2 += $(call cc-option, -Wmissing-field-initializers)
42 warning-2 += $(call cc-option, -Wsign-compare)
43 warning-2 += $(call cc-option, -Wmaybe-uninitialized)
44 warning-2 += $(call cc-option, -Wunused-macros)
45
46 warning-3 := -Wbad-function-cast
47 warning-3 += -Wcast-qual
48 warning-3 += -Wconversion
49 warning-3 += -Wpacked
50 warning-3 += -Wpadded
51 warning-3 += -Wpointer-arith
52 warning-3 += -Wredundant-decls
53 warning-3 += -Wswitch-default
54 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
55
56 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
57 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
58 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
59
60 ifeq ("$(strip $(warning))","")
61         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
62 endif
63
64 KBUILD_CFLAGS += $(warning)
65 else
66
67 ifeq ($(cc-name),clang)
68 KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
69 KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
70 KBUILD_CFLAGS += $(call cc-disable-warning, format)
71 KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
72 KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
73 KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
74 endif
75 endif