diff options
| author | Denis Vlasenko | 2008-06-04 11:28:24 +0000 |
|---|---|---|
| committer | Denis Vlasenko | 2008-06-04 11:28:24 +0000 |
| commit | 1da86d2f40f304d78b2ae4aac3b590b19adc7ce3 (patch) | |
| tree | 6f2a87934ad24c0e640c6313d56d2e28d1e81185 /Makefile.flags | |
| parent | 1e93f3c5859aeebcca7c0480de2bd038defe8b1c (diff) | |
| download | busybox-1da86d2f40f304d78b2ae4aac3b590b19adc7ce3.zip busybox-1da86d2f40f304d78b2ae4aac3b590b19adc7ce3.tar.gz | |
build system: add PIE build option
Diffstat (limited to 'Makefile.flags')
| -rw-r--r-- | Makefile.flags | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/Makefile.flags b/Makefile.flags index 9525889..1cfda26 100644 --- a/Makefile.flags +++ b/Makefile.flags @@ -50,17 +50,31 @@ ifeq ($(CONFIG_DEBUG),y) CFLAGS += $(call cc-option,-g) endif +# If arch/$(ARCH)/Makefile did not override it (with, say, -fPIC)... +ARCH_FPIC ?= -fpic +ARCH_FPIE ?= -fpie +ARCH_PIE ?= -pie + ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y) # on i386: 14% smaller libbusybox.so # (code itself is 9% bigger, we save on relocs/PLT/GOT) -CFLAGS += -fpic +CFLAGS += $(ARCH_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 +CFLAGS_busybox += -static +endif + +ifeq ($(CONFIG_PIE),y) +CFLAGS_busybox += $(ARCH_PIE) +CFLAGS += $(ARCH_FPIE) +# No switch() jump tables. Code growth +1k, binary size down -12k +# due to reduced number of code pointers. +# (TODO: make overridable: some arches may want to not do this) +CFLAGS += $(call cc-option,-fno-jump-tables) endif LDLIBS += m crypt @@ -81,8 +95,6 @@ ifeq ($(CONFIG_DMALLOC),y) LDLIBS += dmalloc endif -#LDFLAGS += -nostdlib - LDFLAGS_ELF2FLT = -Wl,-elf2flt ifneq (,$(findstring $(LDFLAGS_ELF2FLT),$(LDFLAGS))) SKIP_STRIP = y |