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    Contents of /trunk/mkinitrd-magellan/busybox/Makefile.flags

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File size: 4400 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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,-Wunused-function -Wunused-value,)
    27 CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
    28 # warn about C99 declaration after statement
    29 CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
    30 # If you want to add more -Wsomething above, make sure that it is
    31 # still possible to build bbox without warnings.
    32
    33 ifeq ($(CONFIG_WERROR),y)
    34 CFLAGS += $(call cc-option,-Werror,)
    35 ## 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 #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
    44 endif
    45 # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
    46 CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
    47
    48 CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
    49 # -fno-guess-branch-probability: prohibit pseudo-random guessing
    50 # of branch probabilities (hopefully makes bloatcheck more stable):
    51 CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
    52 CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
    53 CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
    54
    55 # FIXME: These warnings are at least partially to be concerned about and should
    56 # be fixed..
    57 #CFLAGS += $(call cc-option,-Wconversion,)
    58
    59 ifneq ($(CONFIG_DEBUG),y)
    60 CFLAGS += $(call cc-option,-Os,)
    61 else
    62 CFLAGS += $(call cc-option,-g,)
    63 #CFLAGS += "-D_FORTIFY_SOURCE=2"
    64 ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
    65 CFLAGS += $(call cc-option,-O0,)
    66 else
    67 CFLAGS += $(call cc-option,-Os,)
    68 endif
    69 endif
    70
    71 # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
    72 ARCH_FPIC ?= -fpic
    73 ARCH_FPIE ?= -fpie
    74 ARCH_PIE ?= -pie
    75
    76 ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
    77 # on i386: 14% smaller libbusybox.so
    78 # (code itself is 9% bigger, we save on relocs/PLT/GOT)
    79 CFLAGS += $(ARCH_FPIC)
    80 # and another 4% reduction of libbusybox.so:
    81 # (external entry points must be marked EXTERNALLY_VISIBLE)
    82 CFLAGS += $(call cc-option,-fvisibility=hidden)
    83 endif
    84
    85 ifeq ($(CONFIG_STATIC),y)
    86 CFLAGS_busybox += -static
    87 endif
    88
    89 ifeq ($(CONFIG_PIE),y)
    90 CFLAGS_busybox += $(ARCH_PIE)
    91 CFLAGS += $(ARCH_FPIE)
    92 endif
    93
    94 ifneq ($(CONFIG_EXTRA_CFLAGS),)
    95 CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
    96 #"))
    97 endif
    98
    99 LDLIBS += m crypt
    100
    101 ifeq ($(CONFIG_PAM),y)
    102 LDLIBS += pam pam_misc
    103 endif
    104
    105 ifeq ($(CONFIG_SELINUX),y)
    106 LDLIBS += selinux sepol
    107 endif
    108
    109 ifeq ($(CONFIG_EFENCE),y)
    110 LDLIBS += efence
    111 endif
    112
    113 ifeq ($(CONFIG_DMALLOC),y)
    114 LDLIBS += dmalloc
    115 endif
    116
    117 # If a flat binary should be built, CFLAGS_busybox="-elf2flt"
    118 # env var should be set for make invocation.
    119 # Here we check whether CFLAGS_busybox indeed contains that flag.
    120 # (For historical reasons, we also check LDFLAGS, which doesn't
    121 # seem to be entirely correct variable to put "-elf2flt" into).
    122 W_ELF2FLT = -elf2flt
    123 ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
    124 SKIP_STRIP = y
    125 endif
    126
    127 # Busybox is a stack-fatty so make sure we increase default size
    128 # TODO: use "make stksizes" to find & fix big stack users
    129 # (we stole scripts/checkstack.pl from the kernel... thanks guys!)
    130 # Reduced from 20k to 16k in 1.9.0.
    131 FLTFLAGS += -s 16000