Makefile

###################### Copyright (C) 2016 Marleson Graf #######################
######################### <github.com/aszdrick/mkm/> ##########################
############################ <aszdrick@gmail.com> #############################
###############################################################################
## Licensed under the Apache License, Version 2.0 (the "License");           ##
## you may not use this file except in compliance with the License.          ##
## You may obtain a copy of the License at                                   ##
##                                                                           ##
##     http://www.apache.org/licenses/LICENSE-2.0                            ##
##                                                                           ##
## Unless required by applicable law or agreed to in writing, software       ##
## distributed under the License is distributed on an "AS IS" BASIS,         ##
## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  ##
## See the License for the specific language governing permissions and       ##
## limitations under the License.                                            ##
###############################################################################

################################## SCALARS ##################################
# Include all Makefile definitions
-include $(wildcard *.mkd)
# Project files
SRC      :=$(shell find $(SRCDIR) -name '*.cpp' 2> /dev/null)
DEP      :=$(patsubst %.cpp,$(DEPDIR)/%.d,$(SRC))
OBJ      :=$(patsubst %.cpp,$(OBJDIR)/%.o,$(SRC))
# Test files
PUREOBJ  :=$(filter-out $(OBJDIR)/$(SRCDIR)/$(MAIN).o,$(OBJ))
TSRC     :=$(shell find $(TESTDIR) -name '*.cpp' 2> /dev/null)
TMAIN    :=$(wildcard $(TESTDIR)/*.cpp)
TDEP     :=$(patsubst %.cpp,$(DEPDIR)/%.d,$(TSRC))
TOBJ     :=$(patsubst %.cpp,$(OBJDIR)/%.o,$(TSRC))
TPUREOBJ :=$(filter-out $(patsubst %.cpp,$(OBJDIR)/%.o,$(TMAIN)),$(TOBJ))
TEXEC    :=$(patsubst $(TESTDIR)/%.cpp,$(BINDIR)/%,$(TMAIN))
TCALL    :=$(patsubst %.cpp,%,$(notdir $(TMAIN)))
# MaKefile eXtension variables
MKXDIR   :=mkx
MKXVAR   :=$(wildcard $(MKXDIR)/*.mxd)
MKXRULE  :=$(wildcard $(MKXDIR)/*.mxr)
MKGNR    :=$(wildcard *.make)
# Autogenerated directories, usefull to quickly create directories structure
MAKEDIR  :=$(BINDIR) $(SRCDIR) $(HDRDIR)
# Printables
CXXPRINT :=$(CXX)

.PHONY: all makedir clean clean_deps clean_all tests

# Include variables used by Makefile Extensions
-include $(MKXVAR)

# Include any other general extension, may override default rule
-include $(MKGNR)

################################# MAIN RULES ##################################
all: makedir $(EXEC)

# Include rules of Makefile Extensions
-include $(MKXRULE)

$(EXEC): $(OBJ)
	@echo "[linking] $@"
	@$(CXX) $(OBJ) -o $@ $(LDLIBS) $(LDFLAGS)

$(OBJDIR)/%.o: %.cpp
	@echo "[$(CXXPRINT)] $< -> .o"
	@mkdir -p $(OBJDIR)/$(*D)
	@$(CXX) $(CXXFLAGS) $(INCLUDE) -c $< -o $@

# For each .cpp file, creates a .d file with all dependencies of .cpp,
# including .d as target (to ensure up-to-date dependencies, in case of
# new includes being added)
$(DEPDIR)/%.d: %.cpp
	@echo "[makedep] $< -> .d"
	@mkdir -p $(DEPDIR)/$(*D)
	@$(CXX) -MM -MP -MT "$(OBJDIR)/$*.o $@" -MF "$@" $< $(INCLUDE) $(CXXFLAGS)

makedir: | $(MAKEDIR)

$(MAKEDIR):
	@echo "[ mkdir ] Creating directory '$@'"
	@mkdir -p $@

################################ TESTS RULES ##################################
tests: makedir $(TCALL) $(TEXEC)

$(foreach t,$(TCALL),$(t): $(PUREOBJ) $(TPUREOBJ) $(OBJDIR)/$(TESTDIR)/$(t).o)

$(TEXEC): LDFLAGS+=-lgtest 

$(TEXEC): $(PUREOBJ) $(TPUREOBJ) $(TMAIN)
	@echo "[linking] $@"
	@$(CXX) $(PUREOBJ) $(TOBJ) -o $@ $(LDLIBS) $(LDFLAGS)

################################ CLEAN RULES ##################################
# Only remove object files
clean: $(MKXCLEAN)
	@$(RM) -r $(OBJDIR)

# Remove object, binary and dependency files
clean_all: clean $(MKXCLNALL)
	@$(RM) -r $(BINDIR)
	@$(RM) -r $(DEPDIR)

################################ PREREQUISITES ################################
# Do not include list of dependencies when they are going to be deleted, i.e.,
# when the target is clean_all
ifneq ($(MAKECMDGOALS), clean_all)
  -include $(DEP)
  ifeq ($(MAKECMDGOALS), tests)
	-include $(TDEP)
  endif
endif