xref: /openbmc/linux/scripts/Makefile.extrawarn (revision f3539c12)
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# $(call cc-option, -W...) handles gcc -W.. options which
10# are not supported by all versions of the compiler
11# ==========================================================================
12
13ifeq ("$(origin W)", "command line")
14  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
15endif
16
17ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
18warning-  := $(empty)
19
20warning-1 := -Wextra -Wunused -Wno-unused-parameter
21warning-1 += -Wmissing-declarations
22warning-1 += -Wmissing-format-attribute
23warning-1 += $(call cc-option, -Wmissing-prototypes)
24warning-1 += -Wold-style-definition
25warning-1 += $(call cc-option, -Wmissing-include-dirs)
26warning-1 += $(call cc-option, -Wunused-but-set-variable)
27warning-1 += $(call cc-option, -Wunused-const-variable)
28warning-1 += $(call cc-disable-warning, missing-field-initializers)
29warning-1 += $(call cc-disable-warning, sign-compare)
30
31warning-2 := -Waggregate-return
32warning-2 += -Wcast-align
33warning-2 += -Wdisabled-optimization
34warning-2 += -Wnested-externs
35warning-2 += -Wshadow
36warning-2 += $(call cc-option, -Wlogical-op)
37warning-2 += $(call cc-option, -Wmissing-field-initializers)
38warning-2 += $(call cc-option, -Wsign-compare)
39
40warning-3 := -Wbad-function-cast
41warning-3 += -Wcast-qual
42warning-3 += -Wconversion
43warning-3 += -Wpacked
44warning-3 += -Wpadded
45warning-3 += -Wpointer-arith
46warning-3 += -Wredundant-decls
47warning-3 += -Wswitch-default
48warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
49warning-3 += $(call cc-option, -Wvla)
50
51warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
52warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
53warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
54
55ifeq ("$(strip $(warning))","")
56        $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
57endif
58
59KBUILD_CFLAGS += $(warning)
60else
61
62ifeq ($(cc-name),clang)
63KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
64KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
65KBUILD_CFLAGS += $(call cc-disable-warning, format)
66KBUILD_CFLAGS += $(call cc-disable-warning, unknown-warning-option)
67KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
68KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
69KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
70endif
71endif
72