source: branches/3.0/mindi-busybox/Makefile.flags @ 2899

Last change on this file since 2899 was 2725, checked in by bruno, 8 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 4.3 KB
Line 
1# ==========================================================================
2# Build system
3# ==========================================================================
4
5BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
6export BB_VER
7SKIP_STRIP ?= n
8
9# -std=gnu99 needed for [U]LLONG_MAX on some systems
10CPPFLAGS += $(call cc-option,-std=gnu99,)
11
12CPPFLAGS += \
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
20CFLAGS += $(call cc-option,-Wall,)
21CFLAGS += $(call cc-option,-Wshadow,)
22CFLAGS += $(call cc-option,-Wwrite-strings,)
23CFLAGS += $(call cc-option,-Wundef,)
24CFLAGS += $(call cc-option,-Wstrict-prototypes,)
25CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
26CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,)
27CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
28# warn about C99 declaration after statement
29CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
30# If you want to add more -Wsomething above, make sure that it is
31# still possible to build bbox without warnings.
32
33ifeq ($(CONFIG_WERROR),y)
34CFLAGS += $(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## Maybe try __attribute__((__may_alias__))?
44#CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing)
45endif
46# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
47CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
48
49CFLAGS += $(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):
52CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
53CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
54CFLAGS += $(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 += $(call cc-option,-Wconversion,)
59
60ifneq ($(CONFIG_DEBUG),y)
61CFLAGS += $(call cc-option,-Os,)
62else
63CFLAGS += $(call cc-option,-g,)
64#CFLAGS += "-D_FORTIFY_SOURCE=2"
65ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
66CFLAGS += $(call cc-option,-O0,)
67else
68CFLAGS += $(call cc-option,-Os,)
69endif
70endif
71
72# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
73ARCH_FPIC ?= -fpic
74ARCH_FPIE ?= -fpie
75ARCH_PIE ?= -pie
76
77ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
78# on i386: 14% smaller libbusybox.so
79# (code itself is 9% bigger, we save on relocs/PLT/GOT)
80CFLAGS += $(ARCH_FPIC)
81# and another 4% reduction of libbusybox.so:
82# (external entry points must be marked EXTERNALLY_VISIBLE)
83CFLAGS += $(call cc-option,-fvisibility=hidden)
84endif
85
86ifeq ($(CONFIG_STATIC),y)
87CFLAGS_busybox += -static
88endif
89
90ifeq ($(CONFIG_PIE),y)
91CFLAGS_busybox += $(ARCH_PIE)
92CFLAGS += $(ARCH_FPIE)
93endif
94
95ifneq ($(CONFIG_EXTRA_CFLAGS),)
96CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
97#"))
98endif
99
100LDLIBS += m crypt
101
102ifeq ($(CONFIG_PAM),y)
103LDLIBS += pam pam_misc
104endif
105
106ifeq ($(CONFIG_SELINUX),y)
107LDLIBS += selinux sepol
108endif
109
110ifeq ($(CONFIG_EFENCE),y)
111LDLIBS += efence
112endif
113
114ifeq ($(CONFIG_DMALLOC),y)
115LDLIBS += dmalloc
116endif
117
118# If a flat binary should be built, CFLAGS_busybox="-elf2flt"
119# 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# seem to be entirely correct variable to put "-elf2flt" into).
123W_ELF2FLT = -elf2flt
124ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
125SKIP_STRIP = y
126endif
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.
132FLTFLAGS += -s 16000
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