Makefile: move some variable definitions to the top Makefile

This commit moves some variable definitions from config.mk
to the top Makefile:

  - HOSTCC, HOSTCFLAGS, HOSTLDFLAGS
  - AS, LD, CC, CPP, etc.
  - SHELL (renamed to CONFIG_SHELL)

I'd like to slim down config.mk file
because it is included from all recursive make.
It is redundant to re-define the variables
every time descending into sub directories.
We should rather define them at the top Makefile
and export them.

U-Boot makefiles has been used "SHELL" variable to store shell
chosen for the user, whereas Linux Kernel uses "CONFIG_SHELL".

We should never use "SHELL" variable because it is
a special variable for GNU Make.
Changing SHELL may cause unpredictable side effects
whose root cause is usually difficult to find.
We should use a generic variable name "CONFIG_SHELL".

We should not use the syntax as follows either:

    rm -f $(obj)tools/env/{fw_printenv,fw_setenv}

This depends on "bash" although GNU Make generally
invokes "sh" to run the each rule.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

Makefile

@@ -161,6 +161,73 @@ ifeq ($(HOSTARCH),$(ARCH))
 CROSS_COMPILE ?=
 endif
 
+# SHELL used by kbuild
+CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
+	  else if [ -x /bin/bash ]; then echo /bin/bash; \
+	  else echo sh; fi ; fi)
+
+HOSTCC       = gcc
+HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
+
+ifeq ($(HOSTOS),cygwin)
+HOSTCFLAGS	+= -ansi
+endif
+
+# Mac OS X / Darwin's C preprocessor is Apple specific.  It
+# generates numerous errors and warnings.  We want to bypass it
+# and use GNU C's cpp.	To do this we pass the -traditional-cpp
+# option to the compiler.  Note that the -traditional-cpp flag
+# DOES NOT have the same semantics as GNU C's flag, all it does
+# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
+#
+# Apple's linker is similar, thanks to the new 2 stage linking
+# multiple symbol definitions are treated as errors, hence the
+# -multiply_defined suppress option to turn off this error.
+#
+ifeq ($(HOSTOS),darwin)
+# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
+DARWIN_MAJOR_VERSION	= $(shell sw_vers -productVersion | cut -f 1 -d '.')
+DARWIN_MINOR_VERSION	= $(shell sw_vers -productVersion | cut -f 2 -d '.')
+
+os_x_before	= $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
+	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
+
+# Snow Leopards build environment has no longer restrictions as described above
+HOSTCC       = $(call os_x_before, 10, 5, "cc", "gcc")
+HOSTCFLAGS  += $(call os_x_before, 10, 4, "-traditional-cpp")
+HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")
+endif
+
+# Make variables (CC, etc...)
+
+AS		= $(CROSS_COMPILE)as
+# Always use GNU ld
+ifneq ($(shell $(CROSS_COMPILE)ld.bfd -v 2> /dev/null),)
+LD		= $(CROSS_COMPILE)ld.bfd
+else
+LD		= $(CROSS_COMPILE)ld
+endif
+CC		= $(CROSS_COMPILE)gcc
+CPP		= $(CC) -E
+AR		= $(CROSS_COMPILE)ar
+NM		= $(CROSS_COMPILE)nm
+LDR		= $(CROSS_COMPILE)ldr
+STRIP		= $(CROSS_COMPILE)strip
+OBJCOPY		= $(CROSS_COMPILE)objcopy
+OBJDUMP		= $(CROSS_COMPILE)objdump
+AWK		= awk
+RANLIB		= $(CROSS_COMPILE)RANLIB
+DTC		= dtc
+CHECK		= sparse
+
+CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
+		  -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
+
+export CONFIG_SHELL HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE AS LD CC
+export CPP AR NM LDR STRIP OBJCOPY OBJDUMP
+export MAKE AWK
+export DTC CHECK CHECKFLAGS
+
 # load other configuration
 include $(TOPDIR)/config.mk
 
@@ -788,27 +855,28 @@ clean:
 	       $(obj)examples/standalone/interrupt			  \
 	       $(obj)examples/standalone/mem_to_mem_idma2intr		  \
 	       $(obj)examples/standalone/sched				  \
-	       $(obj)examples/standalone/smc911{11,x}_eeprom		  \
+	       $(addprefix $(obj)examples/standalone/, smc91111_eeprom smc911x_eeprom) \
 	       $(obj)examples/standalone/test_burst			  \
 	       $(obj)examples/standalone/timer
-	@rm -f $(obj)examples/api/demo{,.bin}
+	@rm -f $(addprefix $(obj)examples/api/, demo demo.bin)
 	@rm -f $(obj)tools/bmp_logo	   $(obj)tools/easylogo/easylogo  \
 	       $(obj)tools/env/fw_printenv				  \
 	       $(obj)tools/envcrc					  \
-	       $(obj)tools/gdb/{gdbcont,gdbsend}			  \
+	       $(addprefix $(obj)tools/gdb/, gdbcont gdbsend)		  \
 	       $(obj)tools/gen_eth_addr    $(obj)tools/img2srec		  \
-	       $(obj)tools/dump{env,}image		  \
+	       $(obj)tools/dumpimage					  \
-	       $(obj)tools/mk{env,}image   $(obj)tools/mpc86x_clk	  \
+	       $(addprefix $(obj)tools/, mkenvimage mkimage)		  \
-	       $(obj)tools/mk{$(BOARD),exynos}spl			  \
+	       $(obj)tools/mpc86x_clk					  \
+	       $(addprefix $(obj)tools/, mk$(BOARD)spl mkexynosspl)	  \
 	       $(obj)tools/mxsboot					  \
 	       $(obj)tools/ncb		   $(obj)tools/ubsha1		  \
 	       $(obj)tools/kernel-doc/docproc				  \
 	       $(obj)tools/proftool
-	@rm -f $(obj)board/cray/L1/{bootscript.c,bootscript.image}	  \
+	@rm -f $(addprefix $(obj)board/cray/L1/, bootscript.c bootscript.image) \
 	       $(obj)board/matrix_vision/*/bootscript.img		  \
 	       $(obj)spl/board/samsung/$(BOARD)/tools/mk$(BOARD)spl	  \
 	       $(obj)u-boot.lds						  \
-	       $(obj)arch/blackfin/cpu/init.{lds,elf}
+	       $(addprefix $(obj)arch/blackfin/cpu/, init.lds init.elf)
 	@rm -f $(obj)include/bmp_logo.h
 	@rm -f $(obj)include/bmp_logo_data.h
 	@rm -f $(obj)lib/asm-offsets.s
@@ -843,11 +911,11 @@ clobber:	tidy
 	@rm -f $(obj)u-boot.dtb
 	@rm -f $(obj)u-boot.sb
 	@rm -f $(obj)u-boot.spr
-	@rm -f $(obj)nand_spl/{u-boot.{lds,lst},System.map}
+	@rm -f $(addprefix $(obj)nand_spl/, u-boot.lds u-boot.lst System.map)
-	@rm -f $(obj)nand_spl/{u-boot-nand_spl.lds,u-boot-spl,u-boot-spl.map}
+	@rm -f $(addprefix $(obj)nand_spl/, u-boot-nand_spl.lds u-boot-spl u-boot-spl.map)
-	@rm -f $(obj)spl/{u-boot-spl,u-boot-spl.bin,u-boot-spl.map}
+	@rm -f $(addprefix $(obj)spl/, u-boot-spl u-boot-spl.bin u-boot-spl.map)
 	@rm -f $(obj)spl/u-boot-spl.lds
-	@rm -f $(obj)tpl/{u-boot-tpl,u-boot-tpl.bin,u-boot-tpl.map}
+	@rm -f $(addprefix $(obj)tpl/, u-boot-tpl u-boot-tpl.bin u-boot-tpl.map)
 	@rm -f $(obj)tpl/u-boot-spl.lds
 	@rm -f $(obj)MLO MLO.byteswap
 	@rm -f $(obj)SPL
@@ -856,7 +924,7 @@ clobber:	tidy
 	@rm -fr $(obj)include/generated
 	@[ ! -d $(obj)nand_spl ] || find $(obj)nand_spl -name "*" -type l -print | xargs rm -f
 	@rm -f $(obj)dts/*.tmp
-	@rm -f $(obj)spl/u-boot-spl{,-pad}.ais
+	@rm -f $(addprefix $(obj)spl/, u-boot-spl.ais, u-boot-spl-pad.ais)
 
 mrproper \
 distclean:	clobber unconfig

config.mk

@@ -6,13 +6,6 @@
 #
 #########################################################################
 
-# Set shell to bash if possible, otherwise fall back to sh
-SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
-	else if [ -x /bin/bash ]; then echo /bin/bash; \
-	else echo sh; fi; fi)
-
-export	SHELL
-
 ifeq ($(CURDIR),$(SRCTREE))
 dir :=
 else
@@ -54,44 +47,6 @@ PLATFORM_RELFLAGS =
 PLATFORM_CPPFLAGS =
 PLATFORM_LDFLAGS =
 
-#########################################################################
-
-HOSTCFLAGS	= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
-		  $(HOSTCPPFLAGS)
-
-#
-# Mac OS X / Darwin's C preprocessor is Apple specific.  It
-# generates numerous errors and warnings.  We want to bypass it
-# and use GNU C's cpp.	To do this we pass the -traditional-cpp
-# option to the compiler.  Note that the -traditional-cpp flag
-# DOES NOT have the same semantics as GNU C's flag, all it does
-# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
-#
-# Apple's linker is similar, thanks to the new 2 stage linking
-# multiple symbol definitions are treated as errors, hence the
-# -multiply_defined suppress option to turn off this error.
-#
-
-ifeq ($(HOSTOS),darwin)
-# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
-DARWIN_MAJOR_VERSION	= $(shell sw_vers -productVersion | cut -f 1 -d '.')
-DARWIN_MINOR_VERSION	= $(shell sw_vers -productVersion | cut -f 2 -d '.')
-
-os_x_before	= $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
-	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
-
-# Snow Leopards build environment has no longer restrictions as described above
-HOSTCC		 = $(call os_x_before, 10, 5, "cc", "gcc")
-HOSTCFLAGS	+= $(call os_x_before, 10, 4, "-traditional-cpp")
-HOSTLDFLAGS	+= $(call os_x_before, 10, 5, "-multiply_defined suppress")
-else
-HOSTCC		= gcc
-endif
-
-ifeq ($(HOSTOS),cygwin)
-HOSTCFLAGS	+= -ansi
-endif
-
 #########################################################################
 #
 # Option checker, gcc version (courtesy linux kernel) to ensure
@@ -117,30 +72,9 @@ endif
 
 # cc-version
 # Usage gcc-ver := $(call cc-version)
-cc-version = $(shell $(SHELL) $(SRCTREE)/scripts/gcc-version.sh $(CC))
+cc-version = $(shell $(CONFIG_SHELL) $(SRCTREE)/scripts/gcc-version.sh $(CC))
-binutils-version = $(shell $(SHELL) $(SRCTREE)/scripts/binutils-version.sh $(AS))
+binutils-version = $(shell $(CONFIG_SHELL) $(SRCTREE)/scripts/binutils-version.sh $(AS))
-dtc-version = $(shell $(SHELL) $(SRCTREE)/scripts/dtc-version.sh $(DTC))
+dtc-version = $(shell $(CONFIG_SHELL) $(SRCTREE)/scripts/dtc-version.sh $(DTC))
-
-#
-# Include the make variables (CC, etc...)
-#
-AS	= $(CROSS_COMPILE)as
-
-# Always use GNU ld
-LD	= $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
-		then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)
-
-CC	= $(CROSS_COMPILE)gcc
-CPP	= $(CC) -E
-AR	= $(CROSS_COMPILE)ar
-NM	= $(CROSS_COMPILE)nm
-LDR	= $(CROSS_COMPILE)ldr
-STRIP	= $(CROSS_COMPILE)strip
-OBJCOPY = $(CROSS_COMPILE)objcopy
-OBJDUMP = $(CROSS_COMPILE)objdump
-RANLIB	= $(CROSS_COMPILE)RANLIB
-DTC	= dtc
-CHECK	= sparse
 
 #########################################################################
 
@@ -286,10 +220,6 @@ ifneq ($(CONFIG_SPL_TEXT_BASE),)
 LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
 endif
 
-# Linus' kernel sanity checking tool
-CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-		  -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
-
 # Location of a usable BFD library, where we define "usable" as
 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 # - When cross-compiling: the root of the cross-environment
@@ -315,6 +245,4 @@ endif
 
 #########################################################################
 
-export	HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE \
-	AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 export	CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS