diff options
Diffstat (limited to 'Rules.mak')
| -rw-r--r-- | Rules.mak | 36 |
1 files changed, 34 insertions, 2 deletions
@@ -81,7 +81,8 @@ CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS))) #GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp") WARNINGS=-Wall -Wstrict-prototypes -Wshadow -CFLAGS=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir) +CFLAGS+=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir) + ARFLAGS=cru @@ -125,6 +126,8 @@ endif CFLAGS+=$(call check_gcc,-funsigned-char,) +CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,) + #-------------------------------------------------------- # Arch specific compiler optimization stuff should go here. # Unless you want to override the defaults, do not set anything @@ -133,15 +136,38 @@ CFLAGS+=$(call check_gcc,-funsigned-char,) # use '-Os' optimization if available, else use -O2 OPTIMIZATION:=$(call check_gcc,-Os,-O2) +ifeq ($(CONFIG_BUILD_AT_ONCE),y) +# gcc 2.95 exits with 0 for "unrecognized option" +ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0) + OPTIMIZATION+=$(call check_gcc,-combine,) +endif +OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,) +PROG_CFLAGS+=$(call check_gcc,-fwhole-program,) +endif # CONFIG_BUILD_AT_ONCE + # Some nice architecture specific optimizations ifeq ($(strip $(TARGET_ARCH)),arm) OPTIMIZATION+=-fstrict-aliasing + OPTIMIZATION+=$(call check_gcc,-msingle-pic-base,) endif ifeq ($(strip $(TARGET_ARCH)),i386) OPTIMIZATION+=$(call check_gcc,-march=i386,) +# gcc-4.0 and older seem to suffer from these +ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0) OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,) OPTIMIZATION+=$(call check_gcc,-falign-functions=0 -falign-jumps=0 -falign-loops=0,\ -malign-functions=0 -malign-jumps=0 -malign-loops=0) +endif # gcc-4.0 and older + +# gcc-4.1 and beyond seem to benefit from these +ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0) + # turn off flags which hurt -Os + OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,) + OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,) + OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,) + + OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,) +endif # gcc-4.1 and beyond endif OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer @@ -173,11 +199,17 @@ ifeq ($(strip $(CONFIG_DEBUG)),y) STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging else CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG - LDFLAGS += -Wl,-warn-common + LDFLAGS += -Wl,-warn-common -Wl,--sort-common STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment endif ifeq ($(strip $(CONFIG_STATIC)),y) LDFLAGS += --static +#else +# LIBRARIES += -ldl +endif + +ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y) + CFLAGS_PIC:= -fPIC #-DPIC endif ifeq ($(strip $(CONFIG_SELINUX)),y) |