# Rules for compilation of C, C++ and assembler sources using GNU
# toolchain.

# Interface to other rules:

# Input variables:
# LIB_DIR - directory where compiled libraries are stored
# OBJS_DIR - directory where intermediate files (.o, .map, ...) are stored
# INCLUDE_DIR - where includes can be found
# from config.omk or Makefile.omk
# CROSS_COMPILE - 
# TARGET_ARCH, DEBUG, OPTIMIZE, DEFS - forms CFLAGS
# from base: SOURCES_DIR
# from Makefile.omk: lib_LOADLIBES

# Output variables:
# SOURCES - all the source files that needs to be compiled (except for shared library sources)
# SOLIB_SOURCES - all the source files that needs to be compiled for a shared library
# OBJ_EXT - extension of object files
# LIB_EXT - extension of library files
# LIB_PREF - prefix for library files
# ASM_EXT - extension of assembler sources

# Templates:
# COMPILER_DEFS_template - definitions that should be defined before
# the following templates can be used. The input variables needs to be
# defined before evaluating this template

# COMPILE_c_o_template, COMPILE_cc_o_template, COMPILE_S_o_template -
# templates that create rules for compilation of sources

# PROGRAM_template, LIBRARY_template, SOLIB_template - templates that
# create rules for compilation of a program, library and shared
# library. The rules can use rules produced by COMPILE_xxx_template.

define COMPILER_DEFS_template
OBJ_EXT = .o
LIB_EXT = .a
LIB_PREF = lib
ASM_EXT = .S

CC = $(CROSS_COMPILE)gcc
LINK = $(CROSS_COMPILE)ld
AR = $(CROSS_COMPILE)ar
OBJCOPY = $(CROSS_COMPILE)objcopy
NM = $(CROSS_COMPILE)nm

CFLAGS += $(TARGET_ARCH) $(DEBUG) $(OPTIMIZE)
CFLAGS	+= -Wall
CFLAGS += -I$(SOURCES_DIR)
CFLAGS += -I$(INCLUDE_DIR)

LOADLIBES += -L$(LIB_DIR)
LOADLIBES += $(lib_LOADLIBES:%=-l%)


-include $(OBJS_DIR)/*.d

SOURCES2OBJS = .o/.c .o/.cc .o/.cxx .o/.S .o/.o

SOURCES2OBJSLO = .lo/.c .lo/.cc .lo/.cxx .lo/.S .lo/.lo

#%.lo: %.c
#	$(CC) -o $@ $(LCFLAGS) -c $<

c_o_COMPILE = $$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(OMK_CPPFLAGS) \
	$(CPPFLAGS) $(OMK_CFLAGS) $$(CFLAGS)

cc_o_COMPILE = $$(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(OMK_CPPFLAGS) \
	$(CPPFLAGS) $(CXXFLAGS) $(OMK_CFLAGS) $$(CFLAGS)

S_o_COMPILE = $$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
	$(CPPFLAGS) $(OMK_CFLAGS) $$(CFLAGS) $(ASFLAGS)


# Check GCC version for user build
ifndef CC_MAJOR_VERSION
CC_MAJOR_VERSION = $$(shell $$(CC) -dumpversion | $(SED4OMK) -e 's/\([^.]\)\..*/\1/')
endif
# Prepare suitable define for dependency building
ifeq ($$(CC_MAJOR_VERSION),2)
CC_DEPFLAGS = -Wp,-MD,"$$@.d.tmp"
else
CC_DEPFLAGS = -MT $$@ -MD -MP -MF "$$@.d.tmp"
endif

endef # COMPILER_DEFS_template


# Syntax: $(call COMPILE_c_o_template,<source>,<target>,<additional c-flags>)
define COMPILE_c_o_template
$(2): $(1) $$(GEN_HEADERS)
	@$(QUIET_CMD_ECHO) "  CC      $$@"
	$(Q) if $$(c_o_COMPILE) $$(CC_DEPFLAGS) $(3) -o $$@ -c $$< ; \
	then mv -f "$$@.d.tmp" "$$@.d" ; \
	else rm -f "$$@.d.tmp" ; exit 1; \
	fi
endef



# Syntax: $(call COMPILE_cc_o_template,<source>,<target>,<additional c-flags>)
define COMPILE_cc_o_template
$(2): $(1) $$(GEN_HEADERS)
	@$(QUIET_CMD_ECHO) "  CXX     $$@"
	$(Q) if $$(cc_o_COMPILE) $$(CC_DEPFLAGS) $(3) -o $$@ -c $$< ; \
	then mv -f "$$@.d.tmp" "$$@.d" ; \
	else rm -f "$$@.d.tmp" ; exit 1; \
	fi
endef

# Syntax: $(call COMPILE_S_o_template,<source>,<target>,<additional c-flags>)
define COMPILE_S_o_template
$(2): $(1) $$(GEN_HEADERS)
	@$(QUIET_CMD_ECHO) "  AS      $$@"
	$(Q) if $$(S_o_COMPILE) -D__ASSEMBLY__ $$(CC_DEPFLAGS) $(3) -o $$@ -c $$< ; \
	then if [ -e "$$@.d.tmp" ] ; then mv -f "$$@.d.tmp" "$$@.d" ; fi ; \
	else rm -f "$$@.d.tmp" ; exit 1; \
	fi
endef

# Syntax: $(call PROGRAM_template,<executable-name>,<dir>,<link-variant>)
define PROGRAM_template

GEN_SOURCES += $$($(1)_GEN_SOURCES)

$(foreach x, $(SOURCES2OBJS),
$(1)_OBJS += $$(patsubst %$(notdir $(x)),%$(dir $(x)),$$(filter %$(notdir $(x)),\
		$$($(1)_SOURCES) $$($(1)_GEN_SOURCES)))
)
$(1)_OBJS := $$(sort $$($(1)_OBJS:%/=%))

SOURCES += $$($(1)_SOURCES)

ifneq ($(LD_SCRIPT),)
$(1)$(3:%=-%)_LDFLAGS = -Wl,-T,$(LD_SCRIPT).ld$(3:%=-%)
endif

$(2)/$(1)$(3:%=-%): $$($(1)_OBJS)
	@$(QUIET_CMD_ECHO) "  LINK    $$@"
	$(Q) $$(shell if [ -z "$$(filter %.cc,$$($(1)_SOURCES))" ] ; \
	  then echo $$(CC)  $$(CPPFLAGS) $$(OMK_CPPFLAGS) $$(OMK_CFLAGS)   $$(CFLAGS) ; \
	  else echo $$(CXX) $$(CPPFLAGS) $$(OMK_CPPFLAGS) $$(OMK_CXXFLAGS) $$(CXXFLAGS) ; fi) \
	  $$(OMK_LDFLAGS) $$(LDFLAGS) $$($(1)$(3:%=-%)_LDFLAGS) -Wl,-Map,$(1)$(3:%=-%).map \
	  $$($(1)_OBJS) $$($(1)_MOREOBJS) $$(LOADLIBES) $$($(1)_LIBS:%=-l%) \
	  -o $$@
	@echo "$(2)/$(1)$(3:%=-%): \\" >$(OBJS_DIR)/$(1)$(3:%=-%).exe.d
	@if [ -n "$(LD_SCRIPT)" ]; then \
	  echo "  $(LIB_DIR)/$(LD_SCRIPT).ld$(3:%=-%) \\" >>$(OBJS_DIR)/$(1)$(3:%=-%).exe.d; fi
	@$(SED4OMK) -n -e 's|^LOAD \(.*\)$$$$|  \1  \&|p' $(OBJS_DIR)/$(1)$(3:%=-%).map|tr '&' '\134'  >>$(OBJS_DIR)/$(1)$(3:%=-%).exe.d
	@echo >>$(OBJS_DIR)/$(1).exe.d
endef

# Rules for other output formats (can be specified by OUTPUT_FORMATS)
%.bin: %
	@$(QUIET_CMD_ECHO) "  OBJCOPY $@"
	$(Q) $(OBJCOPY)  --output-target=binary -S $< $@

%.hex: %
	@$(QUIET_CMD_ECHO) "  OBJCOPY $@"
	$(Q) $(OBJCOPY)  --output-target=ihex -S $< $@

%.srec: %
	@$(QUIET_CMD_ECHO) "  OBJCOPY $@"
	$(Q) $(OBJCOPY)  --output-target=srec -S $< $@

# Syntax: $(call LIBRARY_template,<library-name>)
define LIBRARY_template

GEN_SOURCES += $$($(1)_GEN_SOURCES)

$(foreach x, $(SOURCES2OBJS),
$(1)_OBJS += $$(patsubst %$(notdir $(x)),%$(dir $(x)),$$(filter %$(notdir $(x)),\
		$$($(1)_SOURCES) $$($(1)_GEN_SOURCES)))
)
$(1)_OBJS := $$(sort $$($(1)_OBJS:%/=%))

SOURCES += $$($(1)_SOURCES)

$(LIB_DIR)/lib$(1).a: $$($(1)_OBJS)
	@$(QUIET_CMD_ECHO) "  AR      $$@"
	$(Q) $(AR) rcs $$@ $$^
endef


# Syntax: $(call SOLIB_template,<library-name>)
define SOLIB_template

SOLIB_GEN_SOURCES += $$($(1)_GEN_SOURCES)

$(foreach x, $(SOURCES2OBJSLO),
$(1)_OBJSLO += $$(patsubst %$(notdir $(x)),%$(dir $(x)),$$(filter %$(notdir $(x)),\
		$$($(1)_SOURCES) $$($(1)_GEN_SOURCES)))
)
$(1)_OBJSLO := $$(sort $$($(1)_OBJSLO:%/=%))

SOLIB_OBJS  += $$($(1)_OBJSLO)
SOLIB_SOURCES += $$($(1)_SOURCES)

$(LIB_DIR)/lib$(1).so: $$($(1)_OBJSLO)
	@$(QUIET_CMD_ECHO) "  LINK    $$@"
	$(Q) $(LD) --shared --soname=lib$(1).so -o $$@ $$^
endef