[3320] | 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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| 6 | export BB_VER
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| 7 | SKIP_STRIP ?= n
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| 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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| 14 | $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
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| 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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| 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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| 28 | # warn about C99 declaration after statement
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| 29 | CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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| 30 | # If you want to add more -Wsomething above, make sure that it is
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| 31 | # still possible to build bbox without warnings.
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| 32 |
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| 33 | ifeq ($(CONFIG_WERROR),y)
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| 34 | CFLAGS += $(call cc-option,-Werror,)
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| 35 | ## TODO:
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| 36 | ## gcc version 4.4.0 20090506 (Red Hat 4.4.0-4) (GCC) is a PITA:
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| 37 | ## const char *ptr; ... off_t v = *(off_t*)ptr; -> BOOM
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| 38 | ## and no easy way to convince it to shut the hell up.
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| 39 | ## We have a lot of such things all over the place.
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| 40 | ## Classic *(off_t*)(void*)ptr does not work,
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| 41 | ## and I am unwilling to do crazy gcc specific ({ void *ppp = ...; })
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| 42 | ## stuff in macros. This would obfuscate the code too much.
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| 43 | ## Maybe try __attribute__((__may_alias__))?
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| 44 | #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
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| 45 | endif
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| 46 | # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
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| 47 | CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
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| 48 |
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| 49 | CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
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| 50 | # -fno-guess-branch-probability: prohibit pseudo-random guessing
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| 51 | # of branch probabilities (hopefully makes bloatcheck more stable):
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| 52 | CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
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| 53 | CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
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| 54 | CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
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| 55 |
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| 56 | # FIXME: These warnings are at least partially to be concerned about and should
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| 57 | # be fixed..
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| 58 | #CFLAGS += $(call cc-option,-Wconversion,)
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| 59 |
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| 60 | ifneq ($(CONFIG_DEBUG),y)
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| 61 | CFLAGS += $(call cc-option,-Os,)
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| 62 | else
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| 63 | CFLAGS += $(call cc-option,-g,)
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| 64 | #CFLAGS += "-D_FORTIFY_SOURCE=2"
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| 65 | ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
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| 66 | CFLAGS += $(call cc-option,-O0,)
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| 67 | else
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| 68 | CFLAGS += $(call cc-option,-Os,)
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| 69 | endif
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| 70 | endif
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| 71 |
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| 72 | # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
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| 73 | ARCH_FPIC ?= -fpic
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| 74 | ARCH_FPIE ?= -fpie
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| 75 | ARCH_PIE ?= -pie
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| 76 |
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| 77 | ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
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| 78 | # on i386: 14% smaller libbusybox.so
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| 79 | # (code itself is 9% bigger, we save on relocs/PLT/GOT)
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| 80 | CFLAGS += $(ARCH_FPIC)
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| 81 | # and another 4% reduction of libbusybox.so:
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| 82 | # (external entry points must be marked EXTERNALLY_VISIBLE)
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| 83 | CFLAGS += $(call cc-option,-fvisibility=hidden)
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| 84 | endif
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| 85 |
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| 86 | ifeq ($(CONFIG_STATIC),y)
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| 87 | CFLAGS_busybox += -static
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| 88 | endif
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| 89 |
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| 90 | ifeq ($(CONFIG_PIE),y)
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| 91 | CFLAGS_busybox += $(ARCH_PIE)
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| 92 | CFLAGS += $(ARCH_FPIE)
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| 93 | endif
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| 94 |
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| 95 | ifneq ($(CONFIG_EXTRA_CFLAGS),)
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| 96 | CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
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| 97 | #"))
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| 98 | endif
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| 99 |
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| 100 | LDLIBS += m crypt
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| 101 |
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| 102 | ifeq ($(CONFIG_PAM),y)
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| 103 | LDLIBS += pam pam_misc
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| 104 | endif
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| 105 |
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| 106 | ifeq ($(CONFIG_SELINUX),y)
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| 107 | LDLIBS += selinux sepol
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| 108 | endif
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| 109 |
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| 110 | ifeq ($(CONFIG_EFENCE),y)
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| 111 | LDLIBS += efence
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| 112 | endif
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| 113 |
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| 114 | ifeq ($(CONFIG_DMALLOC),y)
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| 115 | LDLIBS += dmalloc
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| 116 | endif
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| 117 |
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| 118 | # If a flat binary should be built, CFLAGS_busybox="-elf2flt"
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| 119 | # env var should be set for make invocation.
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| 120 | # Here we check whether CFLAGS_busybox indeed contains that flag.
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| 121 | # (For historical reasons, we also check LDFLAGS, which doesn't
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| 122 | # seem to be entirely correct variable to put "-elf2flt" into).
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| 123 | W_ELF2FLT = -elf2flt
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| 124 | ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
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| 125 | SKIP_STRIP = y
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| 126 | endif
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| 127 |
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| 128 | # Busybox is a stack-fatty so make sure we increase default size
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| 129 | # TODO: use "make stksizes" to find & fix big stack users
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| 130 | # (we stole scripts/checkstack.pl from the kernel... thanks guys!)
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| 131 | # Reduced from 20k to 16k in 1.9.0.
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| 132 | FLTFLAGS += -s 16000
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