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,-Wunused-function -Wunused-value,)
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,)
## TODO:
## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
## and no easy way to convince it to shut the hell up.
## We have a lot of such things all over the place.
## Classic *(off_t*)(void*)ptr does not work,
## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
## stuff in macros. This would obfuscate the code too much.
## Maybe try __attribute__((__may_alias__))?
#CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
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

ifneq ($(CONFIG_EXTRA_CFLAGS),)
CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
#"))
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="-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 "-elf2flt" into).
W_ELF2FLT = -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	niro	984	CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,)
27	niro	816	CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
28			# warn about C99 declaration after statement
29			CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
30			# If you want to add more -Wsomething above, make sure that it is
31			# still possible to build bbox without warnings.
32	niro	532
33	niro	816	ifeq ($(CONFIG_WERROR),y)
34			CFLAGS += $(call cc-option,-Werror,)
35	niro	984	## TODO:
36			## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
37			## const char ptr; ... off_t v = (off_t*)ptr; -> BOOM
38			## and no easy way to convince it to shut the hell up.
39			## We have a lot of such things all over the place.
40			## Classic (off_t)(void*)ptr does not work,
41			## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
42			## stuff in macros. This would obfuscate the code too much.
43	niro	1123	## Maybe try __attribute__((__may_alias__))?
44	niro	984	#CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
45	niro	532	endif
46	niro	816	# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
47			CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
48	niro	532
49	niro	816	CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
50			# -fno-guess-branch-probability: prohibit pseudo-random guessing
51			# of branch probabilities (hopefully makes bloatcheck more stable):
52			CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
53			CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
54			CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
55
56			# FIXME: These warnings are at least partially to be concerned about and should
57			# be fixed..
58			#CFLAGS += $(call cc-option,-Wconversion,)
59
60			ifneq ($(CONFIG_DEBUG),y)
61			CFLAGS += $(call cc-option,-Os,)
62			else
63			CFLAGS += $(call cc-option,-g,)
64			#CFLAGS += "-D_FORTIFY_SOURCE=2"
65			ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
66			CFLAGS += $(call cc-option,-O0,)
67			else
68			CFLAGS += $(call cc-option,-Os,)
69			endif
70			endif
71
72			# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
73			ARCH_FPIC ?= -fpic
74			ARCH_FPIE ?= -fpie
75			ARCH_PIE ?= -pie
76
77			ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
78			# on i386: 14% smaller libbusybox.so
79			# (code itself is 9% bigger, we save on relocs/PLT/GOT)
80			CFLAGS += $(ARCH_FPIC)
81			# and another 4% reduction of libbusybox.so:
82			# (external entry points must be marked EXTERNALLY_VISIBLE)
83			CFLAGS += $(call cc-option,-fvisibility=hidden)
84			endif
85
86	niro	532	ifeq ($(CONFIG_STATIC),y)
87	niro	816	CFLAGS_busybox += -static
88	niro	532	endif
89	niro	816
90			ifeq ($(CONFIG_PIE),y)
91			CFLAGS_busybox += $(ARCH_PIE)
92			CFLAGS += $(ARCH_FPIE)
93			endif
94
95	niro	984	ifneq ($(CONFIG_EXTRA_CFLAGS),)
96			CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
97			#"))
98			endif
99
100	niro	816	LDLIBS += m crypt
101
102			ifeq ($(CONFIG_PAM),y)
103			LDLIBS += pam pam_misc
104			endif
105
106			ifeq ($(CONFIG_SELINUX),y)
107			LDLIBS += selinux sepol
108			endif
109
110			ifeq ($(CONFIG_EFENCE),y)
111			LDLIBS += efence
112			endif
113
114			ifeq ($(CONFIG_DMALLOC),y)
115			LDLIBS += dmalloc
116			endif
117
118	niro	984	# If a flat binary should be built, CFLAGS_busybox="-elf2flt"
119	niro	816	# env var should be set for make invocation.
120			# Here we check whether CFLAGS_busybox indeed contains that flag.
121			# (For historical reasons, we also check LDFLAGS, which doesn't
122	niro	984	# seem to be entirely correct variable to put "-elf2flt" into).
123			W_ELF2FLT = -elf2flt
124	niro	816	ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
125			SKIP_STRIP = y
126			endif
127
128			# Busybox is a stack-fatty so make sure we increase default size
129			# TODO: use "make stksizes" to find & fix big stack users
130			# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
131			# Reduced from 20k to 16k in 1.9.0.
132			FLTFLAGS += -s 16000