Denis Vlasenko | 7d219aa | 2006-10-05 10:17:08 +0000 | [diff] [blame] | 1 | # ========================================================================== |
Denis Vlasenko | da8f43f | 2006-10-09 19:47:38 +0000 | [diff] [blame] | 2 | # Build system |
Denis Vlasenko | 7d219aa | 2006-10-05 10:17:08 +0000 | [diff] [blame] | 3 | # ========================================================================== |
| 4 | |
| 5 | BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) |
Denis Vlasenko | def8898 | 2007-10-07 17:06:01 +0000 | [diff] [blame] | 6 | export BB_VER |
Mike Frysinger | b78d561 | 2010-11-16 09:01:30 -0500 | [diff] [blame] | 7 | SKIP_STRIP ?= n |
Denis Vlasenko | 7d219aa | 2006-10-05 10:17:08 +0000 | [diff] [blame] | 8 | |
Denis Vlasenko | bf11e89 | 2006-11-26 22:17:46 +0000 | [diff] [blame] | 9 | # -std=gnu99 needed for [U]LLONG_MAX on some systems |
Bernhard Reutner-Fischer | 82f8788 | 2007-01-23 11:39:13 +0000 | [diff] [blame] | 10 | CPPFLAGS += $(call cc-option,-std=gnu99,) |
Denis Vlasenko | 9dca07d | 2007-01-27 14:03:15 +0000 | [diff] [blame] | 11 | |
Denis Vlasenko | 7039a66 | 2006-10-08 17:54:47 +0000 | [diff] [blame] | 12 | CPPFLAGS += \ |
| 13 | -Iinclude -Ilibbb \ |
Denis Vlasenko | 4b04f54 | 2008-05-08 16:26:49 +0000 | [diff] [blame] | 14 | $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \ |
Denis Vlasenko | 7039a66 | 2006-10-08 17:54:47 +0000 | [diff] [blame] | 15 | -include include/autoconf.h \ |
| 16 | -D_GNU_SOURCE -DNDEBUG \ |
| 17 | $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \ |
Bernhard Reutner-Fischer | feea1b9 | 2006-12-06 21:51:59 +0000 | [diff] [blame] | 18 | -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP |
| 19 | |
Denis Vlasenko | 5599502 | 2008-05-18 22:28:26 +0000 | [diff] [blame] | 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,) |
Denis Vlasenko | 68404f1 | 2008-03-17 09:00:54 +0000 | [diff] [blame] | 25 | CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,) |
Bernhard Reutner-Fischer | 0d22d17 | 2009-02-18 13:23:46 +0000 | [diff] [blame] | 26 | CFLAGS += $(call cc-option,-Wunused-function -Wunused-value,) |
Denis Vlasenko | e251337 | 2008-05-15 21:44:46 +0000 | [diff] [blame] | 27 | CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,) |
Denis Vlasenko | 5599502 | 2008-05-18 22:28:26 +0000 | [diff] [blame] | 28 | # warn about C99 declaration after statement |
| 29 | CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) |
Denis Vlasenko | e251337 | 2008-05-15 21:44:46 +0000 | [diff] [blame] | 30 | # If you want to add more -Wsomething above, make sure that it is |
| 31 | # still possible to build bbox without warnings. |
Denis Vlasenko | c562bb7 | 2007-01-29 17:08:51 +0000 | [diff] [blame] | 32 | |
Denis Vlasenko | 4bb3189 | 2007-02-01 01:51:36 +0000 | [diff] [blame] | 33 | ifeq ($(CONFIG_WERROR),y) |
| 34 | CFLAGS += $(call cc-option,-Werror,) |
Denys Vlasenko | dc3d893 | 2009-08-22 02:34:10 +0200 | [diff] [blame] | 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. |
Dan Fandrich | 1821d18 | 2010-02-04 04:04:56 +0100 | [diff] [blame] | 43 | ## Maybe try __attribute__((__may_alias__))? |
Denys Vlasenko | dc3d893 | 2009-08-22 02:34:10 +0200 | [diff] [blame] | 44 | #CFLAGS += $(call cc-ifversion, -eq, 0404, -fno-strict-aliasing) |
Denis Vlasenko | 4bb3189 | 2007-02-01 01:51:36 +0000 | [diff] [blame] | 45 | endif |
Denis Vlasenko | c562bb7 | 2007-01-29 17:08:51 +0000 | [diff] [blame] | 46 | # 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 | |
Denis Vlasenko | bd8390a | 2008-06-12 20:23:03 +0000 | [diff] [blame] | 49 | CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,) |
Denis Vlasenko | e0eebc1 | 2007-01-27 13:44:53 +0000 | [diff] [blame] | 50 | # -fno-guess-branch-probability: prohibit pseudo-random guessing |
Denis Vlasenko | 9dca07d | 2007-01-27 14:03:15 +0000 | [diff] [blame] | 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,) |
Denis Vlasenko | e0eebc1 | 2007-01-27 13:44:53 +0000 | [diff] [blame] | 54 | CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,) |
Bernhard Reutner-Fischer | 82f8788 | 2007-01-23 11:39:13 +0000 | [diff] [blame] | 55 | |
Bernhard Reutner-Fischer | fdcd7c4 | 2007-01-22 17:50:21 +0000 | [diff] [blame] | 56 | # FIXME: These warnings are at least partially to be concerned about and should |
| 57 | # be fixed.. |
Bernhard Reutner-Fischer | e6ce824 | 2008-08-05 19:06:35 +0000 | [diff] [blame] | 58 | #CFLAGS += $(call cc-option,-Wconversion,) |
Bernhard Reutner-Fischer | 9729e65 | 2006-12-13 17:44:24 +0000 | [diff] [blame] | 59 | |
Denis Vlasenko | bd8390a | 2008-06-12 20:23:03 +0000 | [diff] [blame] | 60 | ifneq ($(CONFIG_DEBUG),y) |
Wolfgang Denk | 91b77c3 | 2011-05-01 14:00:27 +0200 | [diff] [blame] | 61 | CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,)) |
Denis Vlasenko | bd8390a | 2008-06-12 20:23:03 +0000 | [diff] [blame] | 62 | else |
| 63 | CFLAGS += $(call cc-option,-g,) |
Bernhard Reutner-Fischer | e6ce824 | 2008-08-05 19:06:35 +0000 | [diff] [blame] | 64 | #CFLAGS += "-D_FORTIFY_SOURCE=2" |
Denis Vlasenko | bd8390a | 2008-06-12 20:23:03 +0000 | [diff] [blame] | 65 | ifeq ($(CONFIG_DEBUG_PESSIMIZE),y) |
| 66 | CFLAGS += $(call cc-option,-O0,) |
| 67 | else |
Wolfgang Denk | 91b77c3 | 2011-05-01 14:00:27 +0200 | [diff] [blame] | 68 | CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,)) |
Denis Vlasenko | bd8390a | 2008-06-12 20:23:03 +0000 | [diff] [blame] | 69 | endif |
Bernhard Reutner-Fischer | 9729e65 | 2006-12-13 17:44:24 +0000 | [diff] [blame] | 70 | endif |
| 71 | |
Denis Vlasenko | 1da86d2 | 2008-06-04 11:28:24 +0000 | [diff] [blame] | 72 | # If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)... |
| 73 | ARCH_FPIC ?= -fpic |
| 74 | ARCH_FPIE ?= -fpie |
| 75 | ARCH_PIE ?= -pie |
| 76 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 77 | ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y) |
Denis Vlasenko | 8d82cf7 | 2007-10-11 10:02:52 +0000 | [diff] [blame] | 78 | # on i386: 14% smaller libbusybox.so |
| 79 | # (code itself is 9% bigger, we save on relocs/PLT/GOT) |
Denis Vlasenko | 1da86d2 | 2008-06-04 11:28:24 +0000 | [diff] [blame] | 80 | CFLAGS += $(ARCH_FPIC) |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 81 | # and another 4% reduction of libbusybox.so: |
| 82 | # (external entry points must be marked EXTERNALLY_VISIBLE) |
| 83 | CFLAGS += $(call cc-option,-fvisibility=hidden) |
Denis Vlasenko | 8d82cf7 | 2007-10-11 10:02:52 +0000 | [diff] [blame] | 84 | endif |
| 85 | |
Bernhard Reutner-Fischer | c1feac6 | 2007-01-08 16:29:15 +0000 | [diff] [blame] | 86 | ifeq ($(CONFIG_STATIC),y) |
Denis Vlasenko | 1da86d2 | 2008-06-04 11:28:24 +0000 | [diff] [blame] | 87 | CFLAGS_busybox += -static |
| 88 | endif |
| 89 | |
| 90 | ifeq ($(CONFIG_PIE),y) |
| 91 | CFLAGS_busybox += $(ARCH_PIE) |
| 92 | CFLAGS += $(ARCH_FPIE) |
Bernhard Reutner-Fischer | c1feac6 | 2007-01-08 16:29:15 +0000 | [diff] [blame] | 93 | endif |
Denis Vlasenko | d46d3c2 | 2007-02-06 19:28:50 +0000 | [diff] [blame] | 94 | |
Bernhard Reutner-Fischer | f6107c7 | 2009-01-22 13:27:14 +0000 | [diff] [blame] | 95 | ifneq ($(CONFIG_EXTRA_CFLAGS),) |
| 96 | CFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_CFLAGS))) |
| 97 | #")) |
| 98 | endif |
| 99 | |
Denys Vlasenko | e0894f5 | 2011-09-09 18:00:44 +0200 | [diff] [blame] | 100 | ifneq ($(CONFIG_CROSS_COMPILER_PREFIX),"arm-linux-androideabi-") |
Denis Vlasenko | def8898 | 2007-10-07 17:06:01 +0000 | [diff] [blame] | 101 | LDLIBS += m crypt |
Denys Vlasenko | e0894f5 | 2011-09-09 18:00:44 +0200 | [diff] [blame] | 102 | else |
| 103 | # Android libc has no crypt. TODO: make a generic CONFIG_LINK_WITH_CRYPT option? |
| 104 | LDLIBS += m |
| 105 | endif |
Denis Vlasenko | d6e81c7 | 2007-08-21 10:58:18 +0000 | [diff] [blame] | 106 | |
Rob Walker | bf63437 | 2012-03-07 12:25:53 +0100 | [diff] [blame^] | 107 | ifneq ($(CONFIG_SYSROOT),) |
| 108 | CFLAGS += --sysroot=$(CONFIG_SYSROOT) |
| 109 | export SYSROOT=$(CONFIG_SYSROOT) |
| 110 | endif |
| 111 | |
Denis Vlasenko | d6e81c7 | 2007-08-21 10:58:18 +0000 | [diff] [blame] | 112 | ifeq ($(CONFIG_PAM),y) |
Tristan Schmelcher | 5560e1a | 2011-12-05 04:38:58 +0100 | [diff] [blame] | 113 | # libpam uses libpthread, so for static builds busybox must be linked to |
| 114 | # libpthread. On some platforms that requires an explicit -lpthread, so |
| 115 | # it should be in LDLIBS. For non-static builds, scripts/trylink will |
| 116 | # take care of removing -lpthread if possible. (Not bothering to check |
| 117 | # CONFIG_STATIC because even in a non-static build it could be that the |
| 118 | # only libpam available is libpam.a, so -lpthread could still be |
| 119 | # needed.) |
| 120 | LDLIBS += pam pam_misc pthread |
Denis Vlasenko | d6e81c7 | 2007-08-21 10:58:18 +0000 | [diff] [blame] | 121 | endif |
| 122 | |
Denis Vlasenko | d46d3c2 | 2007-02-06 19:28:50 +0000 | [diff] [blame] | 123 | ifeq ($(CONFIG_SELINUX),y) |
Denis Vlasenko | 76a6b23 | 2007-10-07 17:05:42 +0000 | [diff] [blame] | 124 | LDLIBS += selinux sepol |
Denis Vlasenko | d46d3c2 | 2007-02-06 19:28:50 +0000 | [diff] [blame] | 125 | endif |
Bernhard Reutner-Fischer | 58a275b | 2007-03-28 15:00:27 +0000 | [diff] [blame] | 126 | |
| 127 | ifeq ($(CONFIG_EFENCE),y) |
Denis Vlasenko | 76a6b23 | 2007-10-07 17:05:42 +0000 | [diff] [blame] | 128 | LDLIBS += efence |
Bernhard Reutner-Fischer | 58a275b | 2007-03-28 15:00:27 +0000 | [diff] [blame] | 129 | endif |
| 130 | |
| 131 | ifeq ($(CONFIG_DMALLOC),y) |
Denis Vlasenko | 76a6b23 | 2007-10-07 17:05:42 +0000 | [diff] [blame] | 132 | LDLIBS += dmalloc |
Bernhard Reutner-Fischer | 58a275b | 2007-03-28 15:00:27 +0000 | [diff] [blame] | 133 | endif |
| 134 | |
Mike Frysinger | dec37b3 | 2009-03-12 07:56:49 +0000 | [diff] [blame] | 135 | # If a flat binary should be built, CFLAGS_busybox="-elf2flt" |
Denis Vlasenko | 401de64 | 2008-06-06 16:11:12 +0000 | [diff] [blame] | 136 | # env var should be set for make invocation. |
| 137 | # Here we check whether CFLAGS_busybox indeed contains that flag. |
| 138 | # (For historical reasons, we also check LDFLAGS, which doesn't |
Mike Frysinger | dec37b3 | 2009-03-12 07:56:49 +0000 | [diff] [blame] | 139 | # seem to be entirely correct variable to put "-elf2flt" into). |
| 140 | W_ELF2FLT = -elf2flt |
Denis Vlasenko | 401de64 | 2008-06-06 16:11:12 +0000 | [diff] [blame] | 141 | ifneq (,$(findstring $(W_ELF2FLT),$(LDFLAGS) $(CFLAGS_busybox))) |
Mike Frysinger | 5b5bcf2 | 2007-06-19 15:58:02 +0000 | [diff] [blame] | 142 | SKIP_STRIP = y |
| 143 | endif |
| 144 | |
Rob Walker | bf63437 | 2012-03-07 12:25:53 +0100 | [diff] [blame^] | 145 | ifneq ($(CONFIG_EXTRA_LDFLAGS),) |
| 146 | EXTRA_LDFLAGS += $(strip $(subst ",,$(CONFIG_EXTRA_LDFLAGS))) |
| 147 | #")) |
| 148 | endif |
| 149 | |
| 150 | ifneq ($(CONFIG_EXTRA_LDLIBS),) |
| 151 | LDLIBS += $(strip $(subst ",,$(CONFIG_EXTRA_LDLIBS))) |
| 152 | #")) |
| 153 | endif |
| 154 | |
Mike Frysinger | c7b10dc | 2007-04-05 21:10:59 +0000 | [diff] [blame] | 155 | # Busybox is a stack-fatty so make sure we increase default size |
Denis Vlasenko | 931de89 | 2007-06-21 12:43:45 +0000 | [diff] [blame] | 156 | # TODO: use "make stksizes" to find & fix big stack users |
| 157 | # (we stole scripts/checkstack.pl from the kernel... thanks guys!) |
Denis Vlasenko | fcfb5c0 | 2007-12-24 12:16:24 +0000 | [diff] [blame] | 158 | # Reduced from 20k to 16k in 1.9.0. |
| 159 | FLTFLAGS += -s 16000 |