mkinitrd-magellan/busybox/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	# ==========================================================================
2	# Build system
3	# ==========================================================================
4
5	BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
6	export BB_VER
7	SKIP_STRIP = n
8
9	# -std=gnu99 needed for [U]LLONG_MAX on some systems
10	CPPFLAGS += $(call cc-option,-std=gnu99,)
11
12	CPPFLAGS += \
13	-Iinclude -Ilibbb \
14	$(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
15	-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	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 += $(call cc-option,-Wdeclaration-after-statement,)
29	# If you want to add more -Wsomething above, make sure that it is
30	# still possible to build bbox without warnings.
31
32	ifeq ($(CONFIG_WERROR),y)
33	CFLAGS += $(call cc-option,-Werror,)
34	endif
35	# 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
38	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 += $(call cc-option,-fvisibility=hidden)
73	endif
74
75	ifeq ($(CONFIG_STATIC),y)
76	CFLAGS_busybox += -static
77	endif
78
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