removed warning "comparison between signed and unsigned".

[oweals/busybox.git] / Rules.mak

diff --git a/Rules.mak b/Rules.mak
index b3ebeac1fee6436bd2a2cc8010bca10fdd0c81e7..d1995de815d90621c83aa261db7d1e06ae631672 100644 (file)
--- a/Rules.mak
+++ b/Rules.mak
@@ -14,8 +14,8 @@ endif
 PROG      := busybox
 MAJOR_VERSION   :=1
 MINOR_VERSION   :=1
-SUBLEVEL_VERSION:=0
-EXTRAVERSION    :=-pre1
+SUBLEVEL_VERSION:=1
+EXTRAVERSION    :=-pre0
 VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
 
@@ -81,9 +81,16 @@ 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$(srcdir) -funsigned-char
+CFLAGS+=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
+
 ARFLAGS=cru
 
+
+# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
+# get the CC MAJOR/MINOR version
+CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
+CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
+
 #--------------------------------------------------------
 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
 ifeq ($(strip $(TARGET_ARCH)),)
@@ -108,6 +115,19 @@ check_gcc=$(shell \
                then echo "$(1)"; else echo "$(2)"; fi \
        fi)
 
+# A not very robust macro to check for available ld flags
+check_ld=$(shell \
+       if [ "x$(1)" != "x" ]; then \
+               $(LD) --help | grep -q \\$(1) && echo "-Wl,$(1)$(2)" ; \
+       fi)
+
+# A not very robust macro to check for available as flags
+check_as=$(shell \
+       if [ "x$(1)" != "x" ]; then \
+               $(AS) --help | grep -q "\\$(1)" && echo "-Wa,$(1)$(2)" ; \
+       fi)
+
+
 # Setup some shortcuts so that silent mode is silent like it should be
 ifeq ($(subst s,,$(MAKEFLAGS)),$(MAKEFLAGS))
 export MAKE_IS_SILENT=n
@@ -117,6 +137,10 @@ export MAKE_IS_SILENT=y
 SECHO=-@false
 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
@@ -125,17 +149,45 @@ endif
 # 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 $$?)),0)
+       OPTIMIZATION+=$(call check_gcc,--combine,)
+endif
+OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
+PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
+endif # CONFIG_BUILD_AT_ONCE
+
+LIB_LDFLAGS:=$(call check_ld,--enable-new-dtags,)
+#LIB_LDFLAGS+=$(call check_ld,--reduce-memory-overheads,)
+#LIB_LDFLAGS+=$(call check_ld,--as-needed,)
+#LIB_LDFLAGS+=$(call check_ld,--warn-shared-textrel,)
+
+
 # Some nice architecture specific optimizations
 ifeq ($(strip $(TARGET_ARCH)),arm)
        OPTIMIZATION+=-fstrict-aliasing
 endif
 ifeq ($(strip $(TARGET_ARCH)),i386)
        OPTIMIZATION+=$(call check_gcc,-march=i386,)
+# gcc-4.0 and older seem to suffer from these
+ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),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:=$(OPTIMIZATION) -fomit-frame-pointer
+OPTIMIZATIONS:=$(OPTIMIZATION) $(call check_gcc,-fomit-frame-pointer,)
 
 #
 #--------------------------------------------------------
@@ -161,15 +213,22 @@ else
 endif
 ifeq ($(strip $(CONFIG_DEBUG)),y)
     CFLAGS  +=$(WARNINGS) -g -D_GNU_SOURCE
-    LDFLAGS +=-Wl,-warn-common
+    LDFLAGS += $(call check_ld,-warn-common,)
     STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
 else
     CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
-    LDFLAGS += -Wl,-warn-common
+    LDFLAGS += $(call check_ld,-warn-common,)
+    LDFLAGS += $(call check_ld,--sort-common,)
     STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
 endif
 ifeq ($(strip $(CONFIG_STATIC)),y)
-    LDFLAGS += --static
+    LDFLAGS += $(call check_ld,--static,)
+#else
+#    LIBRARIES += -ldl
+endif
+
+ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
+    CFLAGS_PIC:= $(call check_gcc,-fPIC,)
 endif
 
 ifeq ($(strip $(CONFIG_SELINUX)),y)
@@ -197,4 +256,16 @@ endif
 # have a chance of winning.
 CFLAGS += $(CFLAGS_EXTRA)
 
+#------------------------------------------------------------
+# Installation options
+ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
+INSTALL_OPTS=--hardlinks
+endif
+ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
+INSTALL_OPTS=--symlinks
+endif
+ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
+INSTALL_OPTS=
+endif
+
 .PHONY: dummy