[1765] | 1 | # ==========================================================================
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| 2 | # Build system
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| 3 | # ==========================================================================
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| 4 |
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| 5 | BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
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[2725] | 6 | export BB_VER
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| 7 | SKIP_STRIP ?= n
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[1765] | 8 |
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| 9 | # -std=gnu99 needed for [U]LLONG_MAX on some systems
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| 10 | CPPFLAGS += $(call cc-option,-std=gnu99,)
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| 11 |
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| 12 | CPPFLAGS += \
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| 13 | -Iinclude -Ilibbb \
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[2725] | 14 | $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
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[1765] | 15 | -include include/autoconf.h \
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| 16 | -D_GNU_SOURCE -DNDEBUG \
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| 17 | $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
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| 18 | -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
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| 19 |
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[2725] | 20 | CFLAGS += $(call cc-option,-Wall,)
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| 21 | CFLAGS += $(call cc-option,-Wshadow,)
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| 22 | CFLAGS += $(call cc-option,-Wwrite-strings,)
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| 23 | CFLAGS += $(call cc-option,-Wundef,)
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| 24 | CFLAGS += $(call cc-option,-Wstrict-prototypes,)
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| 25 | CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
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| 26 | CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,)
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| 27 | CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
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[3232] | 28 | CFLAGS += $(call cc-option,-Wno-format-security,)
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[2725] | 29 | # warn about C99 declaration after statement
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| 30 | CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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| 31 | # If you want to add more -Wsomething above, make sure that it is
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| 32 | # still possible to build bbox without warnings.
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[1765] | 33 |
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| 34 | ifeq ($(CONFIG_WERROR),y)
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| 35 | CFLAGS += $(call cc-option,-Werror,)
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[2725] | 36 | ## TODO:
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| 37 | ## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
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| 38 | ## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
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| 39 | ## and no easy way to convince it to shut the hell up.
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| 40 | ## We have a lot of such things all over the place.
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| 41 | ## Classic *(off_t*)(void*)ptr does not work,
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| 42 | ## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
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| 43 | ## stuff in macros. This would obfuscate the code too much.
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| 44 | ## Maybe try __attribute__((__may_alias__))?
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| 45 | #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
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[1765] | 46 | endif
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| 47 | # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
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| 48 | CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
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| 49 |
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[2725] | 50 | CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
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[1765] | 51 | # -fno-guess-branch-probability: prohibit pseudo-random guessing
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| 52 | # of branch probabilities (hopefully makes bloatcheck more stable):
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| 53 | CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
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| 54 | CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
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| 55 | CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
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[3232] | 56 | # Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary):
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| 57 | CFLAGS += $(call cc-option,-fno-unwind-tables,)
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| 58 | CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
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[1765] | 59 |
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| 60 | # FIXME: These warnings are at least partially to be concerned about and should
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| 61 | # be fixed..
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[2725] | 62 | #CFLAGS += $(call cc-option,-Wconversion,)
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[1765] | 63 |
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[2725] | 64 | ifneq ($(CONFIG_DEBUG),y)
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[3232] | 65 | CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
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[2725] | 66 | else
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| 67 | CFLAGS += $(call cc-option,-g,)
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| 68 | #CFLAGS += "-D_FORTIFY_SOURCE=2"
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| 69 | ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
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| 70 | CFLAGS += $(call cc-option,-O0,)
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| 71 | else
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[3232] | 72 | CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
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[1765] | 73 | endif
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[2725] | 74 | endif
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[1765] | 75 |
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[2725] | 76 | # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
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| 77 | ARCH_FPIC ?= -fpic
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| 78 | ARCH_FPIE ?= -fpie
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| 79 | ARCH_PIE ?= -pie
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| 80 |
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[3232] | 81 | # Usage: $(eval $(call pkg_check_modules,VARIABLE-PREFIX,MODULES))
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| 82 | define pkg_check_modules
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| 83 | $(1)_CFLAGS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --cflags $(2))
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| 84 | $(1)_LIBS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --libs $(2))
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| 85 | endef
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| 86 |
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[2725] | 87 | ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
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| 88 | # on i386: 14% smaller libbusybox.so
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| 89 | # (code itself is 9% bigger, we save on relocs/PLT/GOT)
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| 90 | CFLAGS += $(ARCH_FPIC)
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| 91 | # and another 4% reduction of libbusybox.so:
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| 92 | # (external entry points must be marked EXTERNALLY_VISIBLE)
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| 93 | CFLAGS += $(call cc-option,-fvisibility=hidden)
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| 94 | endif
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| 95 |
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[1765] | 96 | ifeq ($(CONFIG_STATIC),y)
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[2725] | 97 | CFLAGS_busybox += -static
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[3232] | 98 | PKG_CONFIG_FLAGS += --static
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[1765] | 99 | endif
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| 100 |
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[2725] | 101 | ifeq ($(CONFIG_PIE),y)
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| 102 | CFLAGS_busybox += $(ARCH_PIE)
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| 103 | CFLAGS += $(ARCH_FPIE)
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| 104 | endif
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[1765] | 105 |
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[2725] | 106 | ifneq ($(CONFIG_EXTRA_CFLAGS),)
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| 107 | CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
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| 108 | #"))
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| 109 | endif
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| 110 |
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[3232] | 111 | # Note: both "" (string consisting of two quote chars) and empty string
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| 112 | # are possible, and should be skipped below.
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| 113 | ifneq ($(subst "",,$(CONFIG_SYSROOT)),)
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| 114 | CFLAGS += --sysroot=$(CONFIG_SYSROOT)
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| 115 | export SYSROOT=$(CONFIG_SYSROOT)
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| 116 | endif
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| 117 |
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| 118 | # Android has no separate crypt library
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| 119 | # gcc-4.2.1 fails if we try to feed C source on stdin:
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| 120 | # echo 'int main(void){return 0;}' | $(CC) $(CFLAGS) -lcrypt -o /dev/null -xc -
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| 121 | # fall back to using a temp file:
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| 122 | CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >crypttest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null crypttest.c >/dev/null 2>&1 && echo "y"; rm crypttest.c)
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| 123 | ifeq ($(CRYPT_AVAILABLE),y)
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[2725] | 124 | LDLIBS += m crypt
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[3232] | 125 | else
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| 126 | LDLIBS += m
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| 127 | endif
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[2725] | 128 |
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[1765] | 129 | ifeq ($(CONFIG_PAM),y)
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[3232] | 130 | # libpam uses libpthread, so for static builds busybox must be linked to
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| 131 | # libpthread. On some platforms that requires an explicit -lpthread, so
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| 132 | # it should be in LDLIBS. For non-static builds, scripts/trylink will
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| 133 | # take care of removing -lpthread if possible. (Not bothering to check
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| 134 | # CONFIG_STATIC because even in a non-static build it could be that the
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| 135 | # only libpam available is libpam.a, so -lpthread could still be
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| 136 | # needed.)
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| 137 | LDLIBS += pam pam_misc pthread
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[1765] | 138 | endif
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| 139 |
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| 140 | ifeq ($(CONFIG_SELINUX),y)
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[3232] | 141 | SELINUX_PC_MODULES = libselinux libsepol
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| 142 | $(eval $(call pkg_check_modules,SELINUX,$(SELINUX_PC_MODULES)))
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| 143 | CPPFLAGS += $(SELINUX_CFLAGS)
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| 144 | LDLIBS += $(if $(SELINUX_LIBS),$(SELINUX_LIBS:-l%=%),$(SELINUX_PC_MODULES:lib%=%))
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[1765] | 145 | endif
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| 146 |
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| 147 | ifeq ($(CONFIG_EFENCE),y)
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[2725] | 148 | LDLIBS += efence
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[1765] | 149 | endif
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| 150 |
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| 151 | ifeq ($(CONFIG_DMALLOC),y)
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[2725] | 152 | LDLIBS += dmalloc
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[1765] | 153 | endif
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| 154 |
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[2725] | 155 | # If a flat binary should be built, CFLAGS_busybox="-elf2flt"
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| 156 | # env var should be set for make invocation.
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| 157 | # Here we check whether CFLAGS_busybox indeed contains that flag.
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| 158 | # (For historical reasons, we also check LDFLAGS, which doesn't
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| 159 | # seem to be entirely correct variable to put "-elf2flt" into).
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| 160 | W_ELF2FLT = -elf2flt
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| 161 | ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
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[1765] | 162 | SKIP_STRIP = y
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| 163 | endif
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| 164 |
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[3232] | 165 | ifneq ($(CONFIG_EXTRA_LDFLAGS),)
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| 166 | EXTRA_LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
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| 167 | #"))
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| 168 | endif
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| 169 |
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| 170 | ifneq ($(CONFIG_EXTRA_LDLIBS),)
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| 171 | LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS)))
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| 172 | #"))
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| 173 | endif
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| 174 |
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[1765] | 175 | # Busybox is a stack-fatty so make sure we increase default size
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| 176 | # TODO: use "make stksizes" to find & fix big stack users
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| 177 | # (we stole scripts/checkstack.pl from the kernel... thanks guys!)
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[2725] | 178 | # Reduced from 20k to 16k in 1.9.0.
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| 179 | FLTFLAGS += -s 16000
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