source: branches/3.2/mindi-busybox/Makefile.flags @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 6.4 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,)
28CFLAGS += $(call cc-option,-Wno-format-security,)
29# warn about C99 declaration after statement
30CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
31# If you want to add more -Wsomething above, make sure that it is
32# still possible to build bbox without warnings.
33
34ifeq ($(CONFIG_WERROR),y)
35CFLAGS += $(call cc-option,-Werror,)
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)
46endif
47# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
48CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
49
50CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
51# -fno-guess-branch-probability: prohibit pseudo-random guessing
52# of branch probabilities (hopefully makes bloatcheck more stable):
53CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
54CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
55CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
56# Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary):
57CFLAGS += $(call cc-option,-fno-unwind-tables,)
58CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
59
60# FIXME: These warnings are at least partially to be concerned about and should
61# be fixed..
62#CFLAGS += $(call cc-option,-Wconversion,)
63
64ifneq ($(CONFIG_DEBUG),y)
65CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
66else
67CFLAGS += $(call cc-option,-g,)
68#CFLAGS += "-D_FORTIFY_SOURCE=2"
69ifeq ($(CONFIG_DEBUG_PESSIMIZE),y)
70CFLAGS += $(call cc-option,-O0,)
71else
72CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,))
73endif
74endif
75
76# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)...
77ARCH_FPIC ?= -fpic
78ARCH_FPIE ?= -fpie
79ARCH_PIE ?= -pie
80
81# Usage: $(eval $(call pkg_check_modules,VARIABLE-PREFIX,MODULES))
82define pkg_check_modules
83$(1)_CFLAGS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --cflags $(2))
84$(1)_LIBS := $(shell $(PKG_CONFIG) $(PKG_CONFIG_FLAGS) --libs $(2))
85endef
86
87ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
88# on i386: 14% smaller libbusybox.so
89# (code itself is 9% bigger, we save on relocs/PLT/GOT)
90CFLAGS += $(ARCH_FPIC)
91# and another 4% reduction of libbusybox.so:
92# (external entry points must be marked EXTERNALLY_VISIBLE)
93CFLAGS += $(call cc-option,-fvisibility=hidden)
94endif
95
96ifeq ($(CONFIG_STATIC),y)
97CFLAGS_busybox += -static
98PKG_CONFIG_FLAGS += --static
99endif
100
101ifeq ($(CONFIG_PIE),y)
102CFLAGS_busybox += $(ARCH_PIE)
103CFLAGS += $(ARCH_FPIE)
104endif
105
106ifneq ($(CONFIG_EXTRA_CFLAGS),)
107CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS)))
108#"))
109endif
110
111# Note: both "" (string consisting of two quote chars) and empty string
112# are possible, and should be skipped below.
113ifneq ($(subst "",,$(CONFIG_SYSROOT)),)
114CFLAGS += --sysroot=$(CONFIG_SYSROOT)
115export SYSROOT=$(CONFIG_SYSROOT)
116endif
117
118# Android has no separate crypt library
119# gcc-4.2.1 fails if we try to feed C source on stdin:
120#  echo 'int main(void){return 0;}' | $(CC) $(CFLAGS) -lcrypt -o /dev/null -xc -
121# fall back to using a temp file:
122CRYPT_AVAILABLE := $(shell echo 'int main(void){return 0;}' >crypttest.c; $(CC) $(CFLAGS) -lcrypt -o /dev/null crypttest.c >/dev/null 2>&1 && echo "y"; rm crypttest.c)
123ifeq ($(CRYPT_AVAILABLE),y)
124LDLIBS += m crypt
125else
126LDLIBS += m
127endif
128
129ifeq ($(CONFIG_PAM),y)
130# libpam uses libpthread, so for static builds busybox must be linked to
131# libpthread. On some platforms that requires an explicit -lpthread, so
132# it should be in LDLIBS. For non-static builds, scripts/trylink will
133# take care of removing -lpthread if possible. (Not bothering to check
134# CONFIG_STATIC because even in a non-static build it could be that the
135# only libpam available is libpam.a, so -lpthread could still be
136# needed.)
137LDLIBS += pam pam_misc pthread
138endif
139
140ifeq ($(CONFIG_SELINUX),y)
141SELINUX_PC_MODULES = libselinux libsepol
142$(eval $(call pkg_check_modules,SELINUX,$(SELINUX_PC_MODULES)))
143CPPFLAGS += $(SELINUX_CFLAGS)
144LDLIBS += $(if $(SELINUX_LIBS),$(SELINUX_LIBS:-l%=%),$(SELINUX_PC_MODULES:lib%=%))
145endif
146
147ifeq ($(CONFIG_EFENCE),y)
148LDLIBS += efence
149endif
150
151ifeq ($(CONFIG_DMALLOC),y)
152LDLIBS += dmalloc
153endif
154
155# If a flat binary should be built, CFLAGS_busybox="-elf2flt"
156# env var should be set for make invocation.
157# Here we check whether CFLAGS_busybox indeed contains that flag.
158# (For historical reasons, we also check LDFLAGS, which doesn't
159# seem to be entirely correct variable to put "-elf2flt" into).
160W_ELF2FLT = -elf2flt
161ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox)))
162SKIP_STRIP = y
163endif
164
165ifneq ($(CONFIG_EXTRA_LDFLAGS),)
166EXTRA_LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS)))
167#"))
168endif
169
170ifneq ($(CONFIG_EXTRA_LDLIBS),)
171LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS)))
172#"))
173endif
174
175# Busybox is a stack-fatty so make sure we increase default size
176# TODO: use "make stksizes" to find & fix big stack users
177# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
178# Reduced from 20k to 16k in 1.9.0.
179FLTFLAGS += -s 16000
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