docs/depmod: and example of depmod in shell/sed/awk...

[oweals/busybox.git] / Makefile.flags

diff --git a/Makefile.flags b/Makefile.flags
index 39c544e607a915e5b1c5b0d9e58e8315645877b1..9525889c66b47ca717701d6b9a0c8cafad3fad61 100644 (file)
--- a/Makefile.flags
+++ b/Makefile.flags
@@ -1,19 +1,95 @@
 # ==========================================================================
-# Building
+# Build system
 # ==========================================================================
 
 BB_VER = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
+export BB_VER
+SKIP_STRIP = n
 
-CPPFLAGS       += \
-               -Iinclude -Ilibbb \
-               $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) -I$(srctree)/libbb \
-               -include include/autoconf.h \
-               -D_GNU_SOURCE -DNDEBUG \
-               -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 \
-               -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP \
-               -Wall -Wstrict-prototypes -Wshadow -Werror \
-               -funsigned-char -fno-builtin-strlen -finline-limit=0 -static-libgcc \
-               -Os -march=i386 -mpreferred-stack-boundary=2 \
-               -falign-functions=1 -falign-jumps=1 -falign-loops=1 \
-               -fomit-frame-pointer -ffunction-sections -fdata-sections \
-               -funsigned-char -fno-builtin-strlen \
+# -std=gnu99 needed for [U]LLONG_MAX on some systems
+CPPFLAGS += $(call cc-option,-std=gnu99,)
+
+CPPFLAGS += \
+       -Iinclude -Ilibbb \
+       $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include -I$(srctree)/libbb) \
+       -include include/autoconf.h \
+       -D_GNU_SOURCE -DNDEBUG \
+       $(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64) \
+       -D"BB_VER=KBUILD_STR($(BB_VER))" -DBB_BT=AUTOCONF_TIMESTAMP
+
+CFLAGS += $(call cc-option,-Wall,)
+CFLAGS += $(call cc-option,-Wshadow,)
+CFLAGS += $(call cc-option,-Wwrite-strings,)
+CFLAGS += $(call cc-option,-Wundef,)
+CFLAGS += $(call cc-option,-Wstrict-prototypes,)
+CFLAGS += $(call cc-option,-Wunused -Wunused-parameter,)
+CFLAGS += $(call cc-option,-Wmissing-prototypes -Wmissing-declarations,)
+# warn about C99 declaration after statement
+CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
+# If you want to add more -Wsomething above, make sure that it is
+# still possible to build bbox without warnings.
+
+ifeq ($(CONFIG_WERROR),y)
+CFLAGS += $(call cc-option,-Werror,)
+endif
+# gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action()
+CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition)
+
+CFLAGS += $(call cc-option,-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,)
+# -fno-guess-branch-probability: prohibit pseudo-random guessing
+# of branch probabilities (hopefully makes bloatcheck more stable):
+CFLAGS += $(call cc-option,-fno-guess-branch-probability,)
+CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,)
+CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,)
+
+# FIXME: These warnings are at least partially to be concerned about and should
+# be fixed..
+#CFLAGS+=$(call cc-option,-Wconversion,)
+
+ifeq ($(CONFIG_DEBUG),y)
+CFLAGS += $(call cc-option,-g)
+endif
+
+ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
+# on i386: 14% smaller libbusybox.so
+# (code itself is 9% bigger, we save on relocs/PLT/GOT)
+CFLAGS += -fpic
+# and another 4% reduction of libbusybox.so:
+# (external entry points must be marked EXTERNALLY_VISIBLE)
+CFLAGS += $(call cc-option,-fvisibility=hidden)
+endif
+
+ifeq ($(CONFIG_STATIC),y)
+LDFLAGS += -static
+endif
+
+LDLIBS += m crypt
+
+ifeq ($(CONFIG_PAM),y)
+LDLIBS += pam pam_misc
+endif
+
+ifeq ($(CONFIG_SELINUX),y)
+LDLIBS += selinux sepol
+endif
+
+ifeq ($(CONFIG_EFENCE),y)
+LDLIBS += efence
+endif
+
+ifeq ($(CONFIG_DMALLOC),y)
+LDLIBS += dmalloc
+endif
+
+#LDFLAGS += -nostdlib
+
+LDFLAGS_ELF2FLT = -Wl,-elf2flt
+ifneq (,$(findstring $(LDFLAGS_ELF2FLT),$(LDFLAGS)))
+SKIP_STRIP = y
+endif
+
+# Busybox is a stack-fatty so make sure we increase default size
+# TODO: use "make stksizes" to find & fix big stack users
+# (we stole scripts/checkstack.pl from the kernel... thanks guys!)
+# Reduced from 20k to 16k in 1.9.0.
+FLTFLAGS += -s 16000