aboutsummaryrefslogtreecommitdiff
path: root/Rules.mak
diff options
context:
space:
mode:
authorGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-01-15 14:04:57 +0000
committerGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-01-15 14:04:57 +0000
commit7ca61b6f3379bf66b446617b8834d92c13b366dd (patch)
treec0aaacfeb97a9bc74e73f8ff36ecbf1fd173808b /Rules.mak
parent8c9daa12dcb4c1aa8f0f475896c9cfbcfb38370d (diff)
downloadbusybox-7ca61b6f3379bf66b446617b8834d92c13b366dd.tar.gz
busybox-7ca61b6f3379bf66b446617b8834d92c13b366dd.tar.bz2
- shared libbusybox.
- IMA compilation option (aka IPO, IPA,..) Please holler if i broke something..
Diffstat (limited to 'Rules.mak')
-rw-r--r--Rules.mak36
1 files changed, 34 insertions, 2 deletions
diff --git a/Rules.mak b/Rules.mak
index b142ee41f..df3c22e7d 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -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)