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