Annotation of /tags/mkinitrd-6_5_2/busybox/Makefile.flags
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Wed Sep 7 18:40:16 2011 UTC (13 years ago) by niro
File size: 4445 byte(s)
Wed Sep 7 18:40:16 2011 UTC (13 years ago) by niro
File size: 4445 byte(s)
tagged 'mkinitrd-6_5_2'
1 | niro | 532 | # ========================================================================== |
2 | # Build system | ||
3 | # ========================================================================== | ||
4 | |||
5 | BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) | ||
6 | niro | 816 | export BB_VER |
7 | SKIP_STRIP = n | ||
8 | niro | 532 | |
9 | # -std=gnu99 needed for [U]LLONG_MAX on some systems | ||
10 | niro | 816 | CPPFLAGS += $(call cc-option,-std=gnu99,) |
11 | niro | 532 | |
12 | CPPFLAGS += \ | ||
13 | -Iinclude -Ilibbb \ | ||
14 | niro | 816 | $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \ |
15 | niro | 532 | -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 | niro | 816 | 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 | niro | 984 | CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,) |
27 | niro | 816 | CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,) |
28 | # warn about C99 declaration after statement | ||
29 | CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) | ||
30 | # If you want to add more -Wsomething above, make sure that it is | ||
31 | # still possible to build bbox without warnings. | ||
32 | niro | 532 | |
33 | niro | 816 | ifeq ($(CONFIG_WERROR),y) |
34 | CFLAGS += $(call cc-option,-Werror,) | ||
35 | niro | 984 | ## 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 | niro | 1123 | ## Maybe try __attribute__((__may_alias__))? |
44 | niro | 984 | #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing) |
45 | niro | 532 | endif |
46 | niro | 816 | # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action() |
47 | CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition) | ||
48 | niro | 532 | |
49 | niro | 816 | CFLAGS += $(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): | ||
52 | CFLAGS += $(call cc-option,-fno-guess-branch-probability,) | ||
53 | CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,) | ||
54 | CFLAGS += $(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 += $(call cc-option,-Wconversion,) | ||
59 | |||
60 | ifneq ($(CONFIG_DEBUG),y) | ||
61 | CFLAGS += $(call cc-option,-Os,) | ||
62 | else | ||
63 | CFLAGS += $(call cc-option,-g,) | ||
64 | #CFLAGS += "-D_FORTIFY_SOURCE=2" | ||
65 | ifeq ($(CONFIG_DEBUG_PESSIMIZE),y) | ||
66 | CFLAGS += $(call cc-option,-O0,) | ||
67 | else | ||
68 | CFLAGS += $(call cc-option,-Os,) | ||
69 | endif | ||
70 | endif | ||
71 | |||
72 | # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)... | ||
73 | ARCH_FPIC ?= -fpic | ||
74 | ARCH_FPIE ?= -fpie | ||
75 | ARCH_PIE ?= -pie | ||
76 | |||
77 | ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y) | ||
78 | # on i386: 14% smaller libbusybox.so | ||
79 | # (code itself is 9% bigger, we save on relocs/PLT/GOT) | ||
80 | CFLAGS += $(ARCH_FPIC) | ||
81 | # and another 4% reduction of libbusybox.so: | ||
82 | # (external entry points must be marked EXTERNALLY_VISIBLE) | ||
83 | CFLAGS += $(call cc-option,-fvisibility=hidden) | ||
84 | endif | ||
85 | |||
86 | niro | 532 | ifeq ($(CONFIG_STATIC),y) |
87 | niro | 816 | CFLAGS_busybox += -static |
88 | niro | 532 | endif |
89 | niro | 816 | |
90 | ifeq ($(CONFIG_PIE),y) | ||
91 | CFLAGS_busybox += $(ARCH_PIE) | ||
92 | CFLAGS += $(ARCH_FPIE) | ||
93 | endif | ||
94 | |||
95 | niro | 984 | ifneq ($(CONFIG_EXTRA_CFLAGS),) |
96 | CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS))) | ||
97 | #")) | ||
98 | endif | ||
99 | |||
100 | niro | 816 | LDLIBS += m crypt |
101 | |||
102 | ifeq ($(CONFIG_PAM),y) | ||
103 | LDLIBS += pam pam_misc | ||
104 | endif | ||
105 | |||
106 | ifeq ($(CONFIG_SELINUX),y) | ||
107 | LDLIBS += selinux sepol | ||
108 | endif | ||
109 | |||
110 | ifeq ($(CONFIG_EFENCE),y) | ||
111 | LDLIBS += efence | ||
112 | endif | ||
113 | |||
114 | ifeq ($(CONFIG_DMALLOC),y) | ||
115 | LDLIBS += dmalloc | ||
116 | endif | ||
117 | |||
118 | niro | 984 | # If a flat binary should be built, CFLAGS_busybox="-elf2flt" |
119 | niro | 816 | # 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 | niro | 984 | # seem to be entirely correct variable to put "-elf2flt" into). |
123 | W_ELF2FLT = -elf2flt | ||
124 | niro | 816 | ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox))) |
125 | SKIP_STRIP = y | ||
126 | endif | ||
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. | ||
132 | FLTFLAGS += -s 16000 |