Define SECTION=* and SECTION_IS_* when compiling

The linker scripts are passed through the preprocessor so that
they can distinguish between RO and RW images. This change makes
the same macros available when compiling, so that code can
contain directives like

  #ifdef SECTION_IS_RO

or

  #define FW_SIZE_(section) CONFIG_##section##_SIZE
  #define FW_SIZE(section) FW_SIZE_(section)

  int size = FW_SIZE(SECTION);

BUG=none
BRANCH=none
TEST=make buildall

Nothing uses this yet, so there's no change to the images.

Change-Id: I6e03cd07c134f4b86aeddd9d516b74bbdb95b8a8
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/301255
Reviewed-by: Randall Spangler <rspangler@chromium.org>

Makefile.rules

@@ -26,18 +26,13 @@ _dir_create := $(foreach d,$(dirs),$(shell [ -d $(out)/$(BLD)/$(d) ] || \
 _dir_y_create := $(foreach d,$(dirs-y),$(shell [ -d $(out)/$(BLD)/$(d) ] || \
 	    mkdir -p $(out)/RO/$(d); mkdir -p $(out)/RW/$(d)))
 
-section = $(subst .,,$(suffix $(1)))
-section_is = $(subst .,,SECTION_IS_$(suffix $(1)))
-
 # Decrease verbosity unless you pass V=1
 quiet = $(if $(V),,@echo '  $(2)' $(subst $(out)/,,$@) ; )$(cmd_$(1))
 silent = $(if $(V),,1>/dev/null)
 silent_err = $(if $(V),,2>/dev/null)
 
 # commands to build all targets
-cmd_lds = $(CPP) -P -C -MMD -MF $@.d -MT $@ $(CPPFLAGS) \
-          -D$(call section_is,$*) \
-          -DSECTION=$(call section,$*) $< -o $@
+cmd_lds = $(CPP) -P -C -MMD -MF $@.d -MT $@ $(CPPFLAGS) $< -o $@
 # Allow obj_to_bin to be overridden by board or chip specific commands
 cmd_obj_to_bin ?= $(OBJCOPY) --gap-fill=0xff -O binary $^ $(out)/$*.bin.tmp
 cmd_flat_to_obj = $(CC) -T $(out)/firmware_image.lds -nostdlib $(CPPFLAGS) \

Makefile.toolchain

@@ -42,7 +42,8 @@ CFLAGS_DEFINE=-DOUTDIR=$(out)/$(BLD) -DCHIP=$(CHIP) -DBOARD_TASKFILE=$(_tsk_lst_
               -DCHIP_VARIANT_$(UC_CHIP_VARIANT) -DCHIP_FAMILY_$(UC_CHIP_FAMILY) \
 	      -DFINAL_OUTDIR=$(out)
 CPPFLAGS=$(CFLAGS_DEFINE) $(CFLAGS_INCLUDE) $(CFLAGS_TEST) \
-	 $(EXTRA_CFLAGS) $(CFLAGS_COVERAGE) $(LATE_CFLAGS_DEFINE)
+	 $(EXTRA_CFLAGS) $(CFLAGS_COVERAGE) $(LATE_CFLAGS_DEFINE) \
+	-DSECTION_IS_$(BLD) -DSECTION=$(BLD)
 CFLAGS=$(CPPFLAGS) $(CFLAGS_CPU) $(CFLAGS_DEBUG) $(CFLAGS_WARN) $(CFLAGS_y)
 CFLAGS+= -ffunction-sections -fshort-wchar
 CFLAGS+= -fno-delete-null-pointer-checks -fconserve-stack