[1765] | 1 | # ==========================================================================
|
---|
| 2 | # Build system
|
---|
| 3 | # ==========================================================================
|
---|
| 4 |
|
---|
| 5 | BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
|
---|
[2725] | 6 | export BB_VER
|
---|
| 7 | SKIP_STRIP ?= n
|
---|
[1765] | 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 \
|
---|
[2725] | 14 | $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
|
---|
[1765] | 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 |
|
---|
[2725] | 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,-Wunused-function -Wunused-value,)
|
---|
| 27 | CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
|
---|
[3232] | 28 | CFLAGS += $(call cc-option,-Wno-format-security,)
|
---|
[2725] | 29 | # warn about C99 declaration after statement
|
---|
| 30 | CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
|
---|
| 31 | # If you want to add more -Wsomething above, make sure that it is
|
---|
| 32 | # still possible to build bbox without warnings.
|
---|
[1765] | 33 |
|
---|
| 34 | ifeq ($(CONFIG_WERROR),y)
|
---|
| 35 | CFLAGS += $(call cc-option,-Werror,)
|
---|
[2725] | 36 | ## TODO:
|
---|
| 37 | ## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
|
---|
| 38 | ## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
|
---|
| 39 | ## and no easy way to convince it to shut the hell up.
|
---|
| 40 | ## We have a lot of such things all over the place.
|
---|
| 41 | ## Classic *(off_t*)(void*)ptr does not work,
|
---|
| 42 | ## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
|
---|
| 43 | ## stuff in macros. This would obfuscate the code too much.
|
---|
| 44 | ## Maybe try __attribute__((__may_alias__))?
|
---|
| 45 | #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
|
---|
[1765] | 46 | endif
|
---|
| 47 | # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
|
---|
| 48 | CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
|
---|
| 49 |
|
---|
[2725] | 50 | CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
|
---|
[1765] | 51 | # -fno-guess-branch-probability: prohibit pseudo-random guessing
|
---|
| 52 | # of branch probabilities (hopefully makes bloatcheck more stable):
|
---|
| 53 | CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
|
---|
| 54 | CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
|
---|
| 55 | CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
|
---|
[3232] | 56 | # Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary):
|
---|
| 57 | CFLAGS += $(call cc-option,-fno-unwind-tables,)
|
---|
| 58 | CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
|
---|
[3621] | 59 | # No automatic printf->puts,putchar conversions
|
---|
| 60 | # (try disabling this and comparing assembly, it's instructive)
|
---|
| 61 | CFLAGS += $(call cc-option,-fno-builtin-printf,)
|
---|
[1765] | 62 |
|
---|
| 63 | # FIXME: These warnings are at least partially to be concerned about and should
|
---|
| 64 | # be fixed..
|
---|
[2725] | 65 | #CFLAGS += $(call cc-option,-Wconversion,)
|
---|
[1765] | 66 |
|
---|
[2725] | 67 | ifneq ($(CONFIG_DEBUG),y)
|
---|
[3232] | 68 | CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
|
---|
[2725] | 69 | else
|
---|
| 70 | CFLAGS += $(call cc-option,-g,)
|
---|
| 71 | #CFLAGS += "-D_FORTIFY_SOURCE=2"
|
---|
| 72 | ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
|
---|
| 73 | CFLAGS += $(call cc-option,-O0,)
|
---|
| 74 | else
|
---|
[3232] | 75 | CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
|
---|
[1765] | 76 | endif
|
---|
[2725] | 77 | endif
|
---|
[3621] | 78 | ifeq ($(CONFIG_DEBUG_SANITIZE),y)
|
---|
| 79 | CFLAGS += $(call cc-option,-fsanitize=address,)
|
---|
| 80 | CFLAGS += $(call cc-option,-fsanitize=leak,)
|
---|
| 81 | CFLAGS += $(call cc-option,-fsanitize=undefined,)
|
---|
| 82 | endif
|
---|
[1765] | 83 |
|
---|
[2725] | 84 | # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
|
---|
| 85 | ARCH_FPIC ?= -fpic
|
---|
| 86 | ARCH_FPIE ?= -fpie
|
---|
| 87 | ARCH_PIE ?= -pie
|
---|
| 88 |
|
---|
[3232] | 89 | # Usage: $(eval $(call pkg_check_modules,VARIABLE-PREFIX,MODULES))
|
---|
| 90 | define pkg_check_modules
|
---|
| 91 | $(1)_CFLAGS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --cflags $(2))
|
---|
| 92 | $(1)_LIBS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --libs $(2))
|
---|
| 93 | endef
|
---|
| 94 |
|
---|
[2725] | 95 | ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
|
---|
| 96 | # on i386: 14% smaller libbusybox.so
|
---|
| 97 | # (code itself is 9% bigger, we save on relocs/PLT/GOT)
|
---|
| 98 | CFLAGS += $(ARCH_FPIC)
|
---|
| 99 | # and another 4% reduction of libbusybox.so:
|
---|
| 100 | # (external entry points must be marked EXTERNALLY_VISIBLE)
|
---|
| 101 | CFLAGS += $(call cc-option,-fvisibility=hidden)
|
---|
| 102 | endif
|
---|
| 103 |
|
---|
[1765] | 104 | ifeq ($(CONFIG_STATIC),y)
|
---|
[2725] | 105 | CFLAGS_busybox += -static
|
---|
[3232] | 106 | PKG_CONFIG_FLAGS += --static
|
---|
[1765] | 107 | endif
|
---|
| 108 |
|
---|
[2725] | 109 | ifeq ($(CONFIG_PIE),y)
|
---|
| 110 | CFLAGS_busybox += $(ARCH_PIE)
|
---|
| 111 | CFLAGS += $(ARCH_FPIE)
|
---|
| 112 | endif
|
---|
[1765] | 113 |
|
---|
[2725] | 114 | ifneq ($(CONFIG_EXTRA_CFLAGS),)
|
---|
| 115 | CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
|
---|
| 116 | #"))
|
---|
| 117 | endif
|
---|
| 118 |
|
---|
[3232] | 119 | # Note: both "" (string consisting of two quote chars) and empty string
|
---|
| 120 | # are possible, and should be skipped below.
|
---|
| 121 | ifneq ($(subst "",,$(CONFIG_SYSROOT)),)
|
---|
| 122 | CFLAGS += --sysroot=$(CONFIG_SYSROOT)
|
---|
| 123 | export SYSROOT=$(CONFIG_SYSROOT)
|
---|
| 124 | endif
|
---|
| 125 |
|
---|
| 126 | # Android has no separate crypt library
|
---|
| 127 | # gcc-4.2.1 fails if we try to feed C source on stdin:
|
---|
| 128 | # echo 'int main(void){return 0;}' | $(CC) $(CFLAGS) -lcrypt -o /dev/null -xc -
|
---|
| 129 | # fall back to using a temp file:
|
---|
| 130 | CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >crypttest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null crypttest.c >/dev/null 2>&1 && echo "y"; rm crypttest.c)
|
---|
| 131 | ifeq ($(CRYPT_AVAILABLE),y)
|
---|
[2725] | 132 | LDLIBS += m crypt
|
---|
[3232] | 133 | else
|
---|
| 134 | LDLIBS += m
|
---|
| 135 | endif
|
---|
[2725] | 136 |
|
---|
[3621] | 137 | # libpam may use libpthread, libdl and/or libaudit.
|
---|
| 138 | # On some platforms that requires an explicit -lpthread, -ldl, -laudit.
|
---|
| 139 | # However, on *other platforms* it fails when some of those flags
|
---|
| 140 | # given needlessly. On some systems, crypt needs pthread.
|
---|
| 141 | #
|
---|
| 142 | # I even had a system where a runtime test for pthread
|
---|
| 143 | # (similar to CRYPT_AVAILABLE test above) was not reliable.
|
---|
| 144 | #
|
---|
| 145 | # Do not propagate this mess by adding libraries to CONFIG_PAM/CRYPT_AVAILABLE blocks.
|
---|
| 146 | # Add libraries you need to CONFIG_EXTRA_LDLIBS instead.
|
---|
| 147 |
|
---|
[1765] | 148 | ifeq ($(CONFIG_PAM),y)
|
---|
[3621] | 149 | LDLIBS += pam pam_misc
|
---|
[1765] | 150 | endif
|
---|
| 151 |
|
---|
| 152 | ifeq ($(CONFIG_SELINUX),y)
|
---|
[3232] | 153 | SELINUX_PC_MODULES = libselinux libsepol
|
---|
| 154 | $(eval $(call pkg_check_modules,SELINUX,$(SELINUX_PC_MODULES)))
|
---|
| 155 | CPPFLAGS += $(SELINUX_CFLAGS)
|
---|
| 156 | LDLIBS += $(if $(SELINUX_LIBS),$(SELINUX_LIBS:-l%=%),$(SELINUX_PC_MODULES:lib%=%))
|
---|
[1765] | 157 | endif
|
---|
| 158 |
|
---|
| 159 | ifeq ($(CONFIG_EFENCE),y)
|
---|
[2725] | 160 | LDLIBS += efence
|
---|
[1765] | 161 | endif
|
---|
| 162 |
|
---|
| 163 | ifeq ($(CONFIG_DMALLOC),y)
|
---|
[2725] | 164 | LDLIBS += dmalloc
|
---|
[1765] | 165 | endif
|
---|
| 166 |
|
---|
[2725] | 167 | # If a flat binary should be built, CFLAGS_busybox="-elf2flt"
|
---|
| 168 | # env var should be set for make invocation.
|
---|
| 169 | # Here we check whether CFLAGS_busybox indeed contains that flag.
|
---|
| 170 | # (For historical reasons, we also check LDFLAGS, which doesn't
|
---|
| 171 | # seem to be entirely correct variable to put "-elf2flt" into).
|
---|
| 172 | W_ELF2FLT = -elf2flt
|
---|
| 173 | ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
|
---|
[1765] | 174 | SKIP_STRIP = y
|
---|
| 175 | endif
|
---|
| 176 |
|
---|
[3232] | 177 | ifneq ($(CONFIG_EXTRA_LDFLAGS),)
|
---|
[3621] | 178 | LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
|
---|
[3232] | 179 | #"))
|
---|
| 180 | endif
|
---|
| 181 |
|
---|
| 182 | ifneq ($(CONFIG_EXTRA_LDLIBS),)
|
---|
| 183 | LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS)))
|
---|
| 184 | #"))
|
---|
| 185 | endif
|
---|
| 186 |
|
---|
[1765] | 187 | # Busybox is a stack-fatty so make sure we increase default size
|
---|
| 188 | # TODO: use "make stksizes" to find & fix big stack users
|
---|
| 189 | # (we stole scripts/checkstack.pl from the kernel... thanks guys!)
|
---|
[2725] | 190 | # Reduced from 20k to 16k in 1.9.0.
|
---|
| 191 | FLTFLAGS += -s 16000
|
---|