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 | SKIP_STRIP = n
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7 |
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8 | # -std=gnu99 needed for [U]LLONG_MAX on some systems
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9 | CPPFLAGS += $(call cc-option,-std=gnu99,)
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10 |
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11 | CPPFLAGS += \
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12 | -Iinclude -Ilibbb \
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13 | $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) -I$(srctree)/libbb \
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14 | -include include/autoconf.h \
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15 | -D_GNU_SOURCE -DNDEBUG \
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16 | $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
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17 | -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
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18 |
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19 | # flag checks are grouped together to speed the checks up a bit..
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20 | CFLAGS += $(call cc-option,-Wall -Wshadow -Wwrite-strings,)
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21 | CFLAGS += $(call cc-option,-Wundef -Wstrict-prototypes,)
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22 | # If you want to add "-Wmissing-prototypes -Wmissing-declarations" above
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23 | # (or anything else for that matter) make sure that it is still possible
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24 | # to build bbox without warnings. Current offender: find.c:alloc_action().
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25 | # Looks more like gcc bug: gcc will warn on it with or without prototype.
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26 | # But still, warning-free compile is a must, or else we will drown
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27 | # in warnings pretty soon.
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28 |
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29 | ifeq ($(CONFIG_WERROR),y)
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30 | CFLAGS += $(call cc-option,-Werror,)
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31 | else
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32 | # for development, warn a little bit about unused results..
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33 | CPPFLAGS += -D_FORTIFY_SOURCE=2
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34 | endif
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35 | # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
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36 | CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
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37 |
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38 | # gcc emits bogus "no prev proto" warning on find.c:alloc_action()
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39 | ifneq ($(CONFIG_WERROR),y)
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40 | CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
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41 | endif
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42 |
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43 | CFLAGS += $(call cc-option,-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
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44 | # -fno-guess-branch-probability: prohibit pseudo-random guessing
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45 | # of branch probabilities (hopefully makes bloatcheck more stable):
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46 | CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
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47 | CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
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48 | CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
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49 |
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50 | # FIXME: These warnings are at least partially to be concerned about and should
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51 | # be fixed..
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52 | #CFLAGS+=$(call cc-option,-Wconversion,)
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53 |
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54 | ifeq ($(CONFIG_DEBUG),y)
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55 | CFLAGS += $(call cc-option,-g)
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56 | endif
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57 |
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58 | ifeq ($(CONFIG_STATIC),y)
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59 | LDFLAGS += -static
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60 | endif
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61 |
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62 | BBOX_LIB_LIST = m crypt
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63 |
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64 | ifeq ($(CONFIG_PAM),y)
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65 | BBOX_LIB_LIST += pam pam_misc
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66 | endif
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67 |
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68 | ifeq ($(CONFIG_SELINUX),y)
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69 | BBOX_LIB_LIST += selinux sepol
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70 | endif
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71 |
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72 | ifeq ($(CONFIG_EFENCE),y)
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73 | BBOX_LIB_LIST += efence
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74 | endif
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75 |
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76 | ifeq ($(CONFIG_DMALLOC),y)
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77 | BBOX_LIB_LIST += dmalloc
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78 | endif
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79 |
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80 | # For scripts/trylink
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81 | export BBOX_LIB_LIST
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82 |
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83 | #LDFLAGS += -nostdlib
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84 |
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85 | LDFLAGS_ELF2FLT = -Wl,-elf2flt
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86 | ifneq (,$(findstring $(LDFLAGS_ELF2FLT),$(LDFLAGS)))
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87 | SKIP_STRIP = y
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88 | endif
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89 |
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90 | # Busybox is a stack-fatty so make sure we increase default size
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91 | # TODO: use "make stksizes" to find & fix big stack users
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92 | # (we stole scripts/checkstack.pl from the kernel... thanks guys!)
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93 | FLTFLAGS += -s 20000
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