Contents of /tags/mkinitrd-6_2_1/busybox/Makefile.flags
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Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
File size: 4400 byte(s)
Sun May 30 12:16:23 2010 UTC (14 years, 4 months ago) by niro
File size: 4400 byte(s)
tagged 'mkinitrd-6_2_1'
1 | # ========================================================================== |
2 | # Build system |
3 | # ========================================================================== |
4 | |
5 | BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) |
6 | export BB_VER |
7 | SKIP_STRIP = n |
8 | |
9 | # -std=gnu99 needed for [U]LLONG_MAX on some systems |
10 | CPPFLAGS += $(call cc-option,-std=gnu99,) |
11 | |
12 | CPPFLAGS += \ |
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 | |
20 | 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 | CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,) |
27 | CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,) |
28 | # warn about C99 declaration after statement |
29 | CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) |
30 | # If you want to add more -Wsomething above, make sure that it is |
31 | # still possible to build bbox without warnings. |
32 | |
33 | ifeq ($(CONFIG_WERROR),y) |
34 | CFLAGS += $(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 | #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing) |
44 | endif |
45 | # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action() |
46 | CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition) |
47 | |
48 | CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,) |
49 | # -fno-guess-branch-probability: prohibit pseudo-random guessing |
50 | # of branch probabilities (hopefully makes bloatcheck more stable): |
51 | CFLAGS += $(call cc-option,-fno-guess-branch-probability,) |
52 | CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,) |
53 | CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,) |
54 | |
55 | # FIXME: These warnings are at least partially to be concerned about and should |
56 | # be fixed.. |
57 | #CFLAGS += $(call cc-option,-Wconversion,) |
58 | |
59 | ifneq ($(CONFIG_DEBUG),y) |
60 | CFLAGS += $(call cc-option,-Os,) |
61 | else |
62 | CFLAGS += $(call cc-option,-g,) |
63 | #CFLAGS += "-D_FORTIFY_SOURCE=2" |
64 | ifeq ($(CONFIG_DEBUG_PESSIMIZE),y) |
65 | CFLAGS += $(call cc-option,-O0,) |
66 | else |
67 | CFLAGS += $(call cc-option,-Os,) |
68 | endif |
69 | endif |
70 | |
71 | # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)... |
72 | ARCH_FPIC ?= -fpic |
73 | ARCH_FPIE ?= -fpie |
74 | ARCH_PIE ?= -pie |
75 | |
76 | ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y) |
77 | # on i386: 14% smaller libbusybox.so |
78 | # (code itself is 9% bigger, we save on relocs/PLT/GOT) |
79 | CFLAGS += $(ARCH_FPIC) |
80 | # and another 4% reduction of libbusybox.so: |
81 | # (external entry points must be marked EXTERNALLY_VISIBLE) |
82 | CFLAGS += $(call cc-option,-fvisibility=hidden) |
83 | endif |
84 | |
85 | ifeq ($(CONFIG_STATIC),y) |
86 | CFLAGS_busybox += -static |
87 | endif |
88 | |
89 | ifeq ($(CONFIG_PIE),y) |
90 | CFLAGS_busybox += $(ARCH_PIE) |
91 | CFLAGS += $(ARCH_FPIE) |
92 | endif |
93 | |
94 | ifneq ($(CONFIG_EXTRA_CFLAGS),) |
95 | CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS))) |
96 | #")) |
97 | endif |
98 | |
99 | LDLIBS += m crypt |
100 | |
101 | ifeq ($(CONFIG_PAM),y) |
102 | LDLIBS += pam pam_misc |
103 | endif |
104 | |
105 | ifeq ($(CONFIG_SELINUX),y) |
106 | LDLIBS += selinux sepol |
107 | endif |
108 | |
109 | ifeq ($(CONFIG_EFENCE),y) |
110 | LDLIBS += efence |
111 | endif |
112 | |
113 | ifeq ($(CONFIG_DMALLOC),y) |
114 | LDLIBS += dmalloc |
115 | endif |
116 | |
117 | # If a flat binary should be built, CFLAGS_busybox="-elf2flt" |
118 | # env var should be set for make invocation. |
119 | # Here we check whether CFLAGS_busybox indeed contains that flag. |
120 | # (For historical reasons, we also check LDFLAGS, which doesn't |
121 | # seem to be entirely correct variable to put "-elf2flt" into). |
122 | W_ELF2FLT = -elf2flt |
123 | ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox))) |
124 | SKIP_STRIP = y |
125 | endif |
126 | |
127 | # Busybox is a stack-fatty so make sure we increase default size |
128 | # TODO: use "make stksizes" to find & fix big stack users |
129 | # (we stole scripts/checkstack.pl from the kernel... thanks guys!) |
130 | # Reduced from 20k to 16k in 1.9.0. |
131 | FLTFLAGS += -s 16000 |