- add target hosttools (see make help)

- rename check_gcc to check_cc and pass the CC to use as arg#1; peruse check_cc for HOSTCFLAGS
- add and use check_strip
- add checks for {,no-}whole-archive and {start,end}-group LD flags

1 files changed, 116 insertions, 55 deletions

diff --git a/Rules.mak b/Rules.mak
index ebd09edb3..cce41dcb9 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -31,7 +31,8 @@ BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
 # to something more interesting...  Target architecture is determined
 # by asking the CC compiler what arch it compiles things for, so unless
 # your compiler is broken, you should not need to specify TARGET_ARCH
-CROSS           =$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
+CROSS          =$(strip $(subst ",, $(strip $(CROSS_COMPILER_PREFIX))))
+# be gentle to vi coloring.. "))
 CC             = $(CROSS)gcc
 AR             = $(CROSS)ar
 AS             = $(CROSS)as
@@ -41,16 +42,13 @@ STRIP          = $(CROSS)strip
 ELF2FLT        = $(CROSS)elf2flt
 CPP            = $(CC) -E
 SED           ?= sed
+BZIP2         ?= bzip2
 
 
 # What OS are you compiling busybox for?  This allows you to include
 # OS specific things, syscall overrides, etc.
 TARGET_OS=linux
 
-# Select the compiler needed to build binaries for your development system
-HOSTCC    = gcc
-HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
-
 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 LC_ALL:= C
 
@@ -71,7 +69,7 @@ CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
 #LDFLAGS+=-nostdlib
 #LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
 #CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
-#GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
+#GCCINCDIR:=$(shell gcc -print-search-dirs | $(SED) -ne "s/install: \(.*\)/\1include/gp")
 
 # This must bind late because srcdir is reset for every source subdirectory.
 INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
@@ -79,11 +77,6 @@ CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
 CFLAGS+=$(CHECKED_CFLAGS)
 ARFLAGS=cru
 
-# Warnings
-
-CFLAGS += -Wall -Wstrict-prototypes -Wshadow
-LDFLAGS += $(call check_ld,--warn-common,)
-
 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
 # get the CC MAJOR/MINOR version
 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
@@ -92,7 +85,7 @@ CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | t
 #--------------------------------------------------------
 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
 ifeq ($(strip $(TARGET_ARCH)),)
-TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
+TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
 		-e 's/i.86/i386/' \
 		-e 's/sparc.*/sparc/' \
 		-e 's/arm.*/arm/g' \
@@ -107,27 +100,90 @@ TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
 endif
 
 # A nifty macro to make testing gcc features easier, but note that everything
-# that uses this _must_ use := or it will be re-evaluated for every file.
+# that uses this _must_ use := or it will be re-evaluated everytime it is
+# referenced.
 ifeq ($(strip $(V)),2)
-VERBOSE_CHECK_GCC=echo check_gcc $(1) >> /dev/stderr;
+VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
 endif
-check_gcc=$(shell \
-	$(VERBOSE_CHECK_GCC)\
-	if [ "$(1)" != "" ]; then \
-		if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
-		then echo "$(1)"; else echo "$(2)"; fi \
+check_cc=$(shell \
+	$(VERBOSE_CHECK_CC) \
+	if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
+		echo "int i;" > ./conftest.c; \
+		if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
+		then echo "$(2)"; else echo "$(3)"; fi ; \
+		rm -f conftest.c conftest.o; \
 	fi)
 
 # A not very robust macro to check for available ld flags
+ifeq ($(strip $(V)),2)
+VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
+endif
 check_ld=$(shell \
-	if [ "x$(1)" != "x" ]; then \
-		$(LD) --help | grep -q "\$(1)" && echo "-Wl,$(1)" ; \
+	$(VERBOSE_CHECK_LD) \
+	if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
+		$(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
+		echo "-Wl,$(2)" ; \
 	fi)
 
+# A not very robust macro to check for available strip flags
+ifeq ($(strip $(V)),2)
+VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
+endif
+check_strip=$(shell \
+	$(VERBOSE_CHECK_STRIP) \
+	if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
+		echo "int i;" > ./conftest.c ; \
+		$(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
+		$(1) $(2) conftest.o > /dev/null 2>&1 && \
+		echo "$(1) $(2)" || echo "$(3)"; \
+		rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
+	fi)
+
+
+
+# Select the compiler needed to build binaries for your development system
+HOSTCC     = gcc
+HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
+HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
+HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
+HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
+
+LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
+	$(CC) -c -o conftest.o conftest.c ; \
+	echo "int main(void){return 0;}" > conftest_main.c ; \
+	$(CC) -c -o conftest_main.o conftest_main.c ; \
+	$(AR) $(ARFLAGS) conftest.a conftest.o ; \
+	$(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
+	 conftest_main.o -o conftest > /dev/null 2>&1 \
+	 && echo "-Wl,--whole-archive" ; \
+	rm conftest_main.o conftest_main.c conftest.o conftest.c \
+	 conftest.a conftest > /dev/null 2>&1 ; )
+ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
+LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
+endif
+
+LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
+	$(CC) -c -o conftest.o conftest.c ; \
+	echo "int main(void){return bar();}" > conftest_main.c ; \
+	$(CC) -c -o conftest_main.o conftest_main.c ; \
+	$(AR) $(ARFLAGS) conftest.a conftest.o ; \
+	$(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
+	 -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
+	echo rm conftest_main.o conftest_main.c conftest.o conftest.c \
+	 conftest.a conftest > /dev/null 2>&1 ; )
+ifneq ($(findstring start-group,$(LD_START_GROUP)),)
+LD_END_GROUP:= -Wl,--end-group
+endif
+
+CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
+
 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
-CHECKED_CFLAGS:=$(call check_gcc,-funsigned-char,)
-CHECKED_CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
-CHECKED_CFLAGS+=$(call check_gcc,-fno-builtin-strlen)
+CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-mmax-stack-frame=256,)
+CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen)
 
 # Preemptively pin this too.
 PROG_CFLAGS:=
@@ -139,26 +195,26 @@ PROG_CFLAGS:=
 # for OPTIMIZATION...
 
 # use '-Os' optimization if available, else use -O2
-OPTIMIZATION:=$(call check_gcc,-Os,-O2)
+OPTIMIZATION:=$(call check_cc,$(CC),-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)
-	CFLAGS_COMBINE:=$(call check_gcc,--combine,)
+	CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
 endif
-OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
-OPTIMIZATION+=$(call check_gcc,-fgcse-after-reload,)
+OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
+OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
 # This prevents us from using -fwhole-program when we build the lib
-PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
+PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
 endif # CONFIG_BUILD_LIBBUSYBOX
 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,)
+LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
+#LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
+#LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
+#LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
 
 
 # Some nice architecture specific optimizations
@@ -166,25 +222,25 @@ ifeq ($(strip $(TARGET_ARCH)),arm)
 	OPTIMIZATION+=-fstrict-aliasing
 endif
 ifeq ($(strip $(TARGET_ARCH)),i386)
-	OPTIMIZATION+=$(call check_gcc,-march=i386,)
+	OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
 # gcc-4.0 and older seem to benefit 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=1 -falign-jumps=1 -falign-loops=1,\
+	OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
+	OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
 		-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_cc,$(CC),-fno-tree-loop-optimize,)
+	OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
+	OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
 
-	OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,)
+	OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
 endif # gcc-4.1 and beyond
 endif
-OPTIMIZATION+=$(call check_gcc,-fomit-frame-pointer,)
+OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
 
 #
 #--------------------------------------------------------
@@ -215,7 +271,7 @@ ifeq ($(strip $(CONFIG_DEBUG)),y)
     CFLAGS +=-g
 else
     CFLAGS +=-DNDEBUG
-    LDFLAGS += $(call check_ld,--sort-common,)
+    CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
 endif
 
 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
@@ -224,27 +280,26 @@ endif
 
 # warn a bit more verbosely for non-release versions
 ifneq ($(EXTRAVERSION),)
-    CHECKED_CFLAGS+=$(call check_gcc,-Wstrict-prototypes,)
-    CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-prototypes,)
-    CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-declarations,)
-    CHECKED_CFLAGS+=$(call check_gcc,-Wunused,)
-    CHECKED_CFLAGS+=$(call check_gcc,-Winit-self,)
-    CHECKED_CFLAGS+=$(call check_gcc,-Wshadow,)
-    CHECKED_CFLAGS+=$(call check_gcc,-Wcast-align,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
+    CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
 endif
-STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
+STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
 ifeq ($(strip $(CONFIG_STATIC)),y)
-    PROG_CFLAGS += $(call check_gcc,-static,)
+    PROG_CFLAGS += $(call check_cc,$(CC),-static,)
 endif
-CFLAGS_SHARED := $(call check_gcc,-shared,)
+CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
 LIB_CFLAGS+=$(CFLAGS_SHARED)
 
 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
-    CFLAGS_PIC:= $(call check_gcc,-fPIC,)
+    CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
     LIB_CFLAGS+=$(CFLAGS_PIC)
 endif
 
-
 ifeq ($(strip $(CONFIG_SELINUX)),y)
     LIBRARIES += -lselinux
 endif
@@ -253,6 +308,10 @@ ifeq ($(strip $(PREFIX)),)
     PREFIX:=`pwd`/_install
 endif
 
+#ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
+#    CFLAGS += -D__need_getopt
+#endif
+
 # Additional complications due to support for pristine source dir.
 # Include files in the build directory should take precedence over
 # the copy in top_srcdir, both during the compilation phase and the
@@ -261,7 +320,9 @@ endif
 
 
 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
-CFLAGS    += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
+CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
+LDFLAGS += $(CHECKED_LDFLAGS)
+
 ifdef BB_INIT_SCRIPT
     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 endif