tags/mkinitrd-6_2_0/Makefile.flags

# ==========================================================================
# Build system
# ==========================================================================

BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
export BB_VER
SKIP_STRIP = n

# -std=gnu99 needed for [U]LLONG_MAX on some systems
CPPFLAGS += $(call cc-option,-std=gnu99,)

CPPFLAGS += \
	-Iinclude -Ilibbb \
	$(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
	-include include/autoconf.h \
	-D_GNU_SOURCE -DNDEBUG \
	$(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
	-D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP

CFLAGS += $(call cc-option,-Wall,)
CFLAGS += $(call cc-option,-Wshadow,)
CFLAGS += $(call cc-option,-Wwrite-strings,)
CFLAGS += $(call cc-option,-Wundef,)
CFLAGS += $(call cc-option,-Wstrict-prototypes,)
CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
# warn about C99 declaration after statement
CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
# If you want to add more -Wsomething above, make sure that it is
# still possible to build bbox without warnings.

ifeq ($(CONFIG_WERROR),y)
CFLAGS += $(call cc-option,-Werror,)
endif
# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)

CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
# -fno-guess-branch-probability: prohibit pseudo-random guessing
# of branch probabilities (hopefully makes bloatcheck more stable):
CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)

# FIXME: These warnings are at least partially to be concerned about and should
# be fixed..
#CFLAGS += $(call cc-option,-Wconversion,)

ifneq ($(CONFIG_DEBUG),y)
CFLAGS += $(call cc-option,-Os,)
else
CFLAGS += $(call cc-option,-g,)
#CFLAGS += "-D_FORTIFY_SOURCE=2"
ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
CFLAGS += $(call cc-option,-O0,)
else
CFLAGS += $(call cc-option,-Os,)
endif
endif

# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
ARCH_FPIC ?= -fpic
ARCH_FPIE ?= -fpie
ARCH_PIE ?= -pie

ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
# on i386: 14% smaller libbusybox.so
# (code itself is 9% bigger, we save on relocs/PLT/GOT)
CFLAGS += $(ARCH_FPIC)
# and another 4% reduction of libbusybox.so:
# (external entry points must be marked EXTERNALLY_VISIBLE)
CFLAGS += $(call cc-option,-fvisibility=hidden)
endif

ifeq ($(CONFIG_STATIC),y)
CFLAGS_busybox += -static
endif

ifeq ($(CONFIG_PIE),y)
CFLAGS_busybox += $(ARCH_PIE)
CFLAGS += $(ARCH_FPIE)
endif

LDLIBS += m crypt

ifeq ($(CONFIG_PAM),y)
LDLIBS += pam pam_misc
endif

ifeq ($(CONFIG_SELINUX),y)
LDLIBS += selinux sepol
endif

ifeq ($(CONFIG_EFENCE),y)
LDLIBS += efence
endif

ifeq ($(CONFIG_DMALLOC),y)
LDLIBS += dmalloc
endif

# If a flat binary should be built, CFLAGS_busybox="-Wl,-elf2flt"
# env var should be set for make invocation.
# Here we check whether CFLAGS_busybox indeed contains that flag.
# (For historical reasons, we also check LDFLAGS, which doesn't
# seem to be entirely correct variable to put "-Wl,-elf2flt" into).
W_ELF2FLT = -Wl,-elf2flt
ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
SKIP_STRIP = y
endif

# Busybox is a stack-fatty so make sure we increase default size
# TODO: use "make stksizes" to find & fix big stack users
# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
# Reduced from 20k to 16k in 1.9.0.
FLTFLAGS += -s 16000
1	niro	532	# ==========================================================================
2			# Build system
3			# ==========================================================================
4
5			BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
6	niro	816	export BB_VER
7			SKIP_STRIP = n
8	niro	532
9			# -std=gnu99 needed for [U]LLONG_MAX on some systems
10	niro	816	CPPFLAGS += $(call cc-option,-std=gnu99,)
11	niro	532
12			CPPFLAGS += \
13			-Iinclude -Ilibbb \
14	niro	816	$(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
15	niro	532	-include include/autoconf.h \
16			-D_GNU_SOURCE -DNDEBUG \
17			$(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
18			-D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
19
20	niro	816	CFLAGS += $(call cc-option,-Wall,)
21			CFLAGS += $(call cc-option,-Wshadow,)
22			CFLAGS += $(call cc-option,-Wwrite-strings,)
23			CFLAGS += $(call cc-option,-Wundef,)
24			CFLAGS += $(call cc-option,-Wstrict-prototypes,)
25			CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
26			CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
27			# warn about C99 declaration after statement
28			CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
29			# If you want to add more -Wsomething above, make sure that it is
30			# still possible to build bbox without warnings.
31	niro	532
32	niro	816	ifeq ($(CONFIG_WERROR),y)
33			CFLAGS += $(call cc-option,-Werror,)
34	niro	532	endif
35	niro	816	# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
36			CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
37	niro	532
38	niro	816	CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
39			# -fno-guess-branch-probability: prohibit pseudo-random guessing
40			# of branch probabilities (hopefully makes bloatcheck more stable):
41			CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
42			CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
43			CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
44
45			# FIXME: These warnings are at least partially to be concerned about and should
46			# be fixed..
47			#CFLAGS += $(call cc-option,-Wconversion,)
48
49			ifneq ($(CONFIG_DEBUG),y)
50			CFLAGS += $(call cc-option,-Os,)
51			else
52			CFLAGS += $(call cc-option,-g,)
53			#CFLAGS += "-D_FORTIFY_SOURCE=2"
54			ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
55			CFLAGS += $(call cc-option,-O0,)
56			else
57			CFLAGS += $(call cc-option,-Os,)
58			endif
59			endif
60
61			# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
62			ARCH_FPIC ?= -fpic
63			ARCH_FPIE ?= -fpie
64			ARCH_PIE ?= -pie
65
66			ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
67			# on i386: 14% smaller libbusybox.so
68			# (code itself is 9% bigger, we save on relocs/PLT/GOT)
69			CFLAGS += $(ARCH_FPIC)
70			# and another 4% reduction of libbusybox.so:
71			# (external entry points must be marked EXTERNALLY_VISIBLE)
72			CFLAGS += $(call cc-option,-fvisibility=hidden)
73			endif
74
75	niro	532	ifeq ($(CONFIG_STATIC),y)
76	niro	816	CFLAGS_busybox += -static
77	niro	532	endif
78	niro	816
79			ifeq ($(CONFIG_PIE),y)
80			CFLAGS_busybox += $(ARCH_PIE)
81			CFLAGS += $(ARCH_FPIE)
82			endif
83
84			LDLIBS += m crypt
85
86			ifeq ($(CONFIG_PAM),y)
87			LDLIBS += pam pam_misc
88			endif
89
90			ifeq ($(CONFIG_SELINUX),y)
91			LDLIBS += selinux sepol
92			endif
93
94			ifeq ($(CONFIG_EFENCE),y)
95			LDLIBS += efence
96			endif
97
98			ifeq ($(CONFIG_DMALLOC),y)
99			LDLIBS += dmalloc
100			endif
101
102			# If a flat binary should be built, CFLAGS_busybox="-Wl,-elf2flt"
103			# env var should be set for make invocation.
104			# Here we check whether CFLAGS_busybox indeed contains that flag.
105			# (For historical reasons, we also check LDFLAGS, which doesn't
106			# seem to be entirely correct variable to put "-Wl,-elf2flt" into).
107			W_ELF2FLT = -Wl,-elf2flt
108			ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
109			SKIP_STRIP = y
110			endif
111
112			# Busybox is a stack-fatty so make sure we increase default size
113			# TODO: use "make stksizes" to find & fix big stack users
114			# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
115			# Reduced from 20k to 16k in 1.9.0.
116			FLTFLAGS += -s 16000