Merge tag 'for-4.14/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git...
[muen/linux.git] / scripts / Makefile.extrawarn
1 # ==========================================================================
2 #
3 # make W=... settings
4 #
5 # W=1 - warnings that may be relevant and does not occur too often
6 # W=2 - warnings that occur quite often but may still be relevant
7 # W=3 - the more obscure warnings, can most likely be ignored
8 #
9 # $(call cc-option, -W...) handles gcc -W.. options which
10 # are not supported by all versions of the compiler
11 # ==========================================================================
12
13 ifeq ("$(origin W)", "command line")
14   export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
15 endif
16
17 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
18 warning-  := $(empty)
19
20 warning-1 := -Wextra -Wunused -Wno-unused-parameter
21 warning-1 += -Wmissing-declarations
22 warning-1 += -Wmissing-format-attribute
23 warning-1 += $(call cc-option, -Wmissing-prototypes)
24 warning-1 += -Wold-style-definition
25 warning-1 += $(call cc-option, -Wmissing-include-dirs)
26 warning-1 += $(call cc-option, -Wunused-but-set-variable)
27 warning-1 += $(call cc-option, -Wunused-const-variable)
28 warning-1 += $(call cc-disable-warning, missing-field-initializers)
29 warning-1 += $(call cc-disable-warning, sign-compare)
30
31 warning-2 := -Waggregate-return
32 warning-2 += -Wcast-align
33 warning-2 += -Wdisabled-optimization
34 warning-2 += -Wnested-externs
35 warning-2 += -Wshadow
36 warning-2 += $(call cc-option, -Wlogical-op)
37 warning-2 += $(call cc-option, -Wmissing-field-initializers)
38 warning-2 += $(call cc-option, -Wsign-compare)
39 warning-2 += $(call cc-option, -Wmaybe-uninitialized)
40
41 warning-3 := -Wbad-function-cast
42 warning-3 += -Wcast-qual
43 warning-3 += -Wconversion
44 warning-3 += -Wpacked
45 warning-3 += -Wpadded
46 warning-3 += -Wpointer-arith
47 warning-3 += -Wredundant-decls
48 warning-3 += -Wswitch-default
49 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
50 warning-3 += $(call cc-option, -Wvla)
51
52 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
53 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
54 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
55
56 ifeq ("$(strip $(warning))","")
57         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
58 endif
59
60 KBUILD_CFLAGS += $(warning)
61 else
62
63 ifeq ($(cc-name),clang)
64 KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
65 KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
66 KBUILD_CFLAGS += $(call cc-disable-warning, format)
67 KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
68 KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
69 KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
70 endif
71 endif