# Make rules for FSL projects
#
# Automatic GNU make rules are used for compiling C and C++ files.

all:

help:
	@echo " make         Rebuild project targets";
	@echo " make clean   Remove executables, libraries and object files";
	@echo " make install Install into your local FSLDEVDIR";

clean:
	${RM} -f *.o *.a *.so *.exe \
      ${XFILES} ${FXFILES} ${SOFILES} ${AFILES} ${TESTXFILES}
	${RM} -rf ${DEPDIR}

insertcopyright:
	${FSLDIR}/share/fsl/sbin/insertcopyright * */*

# Automatically generate Make rules and dependencies for
# all source files in the project. Based on the technique
# described at:
#
# https://make.mad-scientist.net/papers/advanced-auto-dependency-generation/
#
# This mechanism supports C (.c), C++ (.cc, .cxx, .cpp)
# and CUDA (.cu) source files.
#
# For each source file, a dependency file is created in a
# subdirectory .deps/, which defines a rule specifying the
# dependencies for that source file. The dependency file
# is created the first time that the source file is compiled
# (as part of a single compiler invocation).
DEPDIR = .deps

# The default directory for object files is the project
# directory (i.e. "."), but this can be overridden via
# the BUILDDIR and CUDABUILDDIR variables. Note that these
# variables must be set *before* this file is included.
#
# Make sure we have a single trailing slash to use in the
# compilation rules below.
ifdef SRCDIR
SRCDIR_ := ${SRCDIR:/=}/
endif

ifdef BUILDDIR
BUILDDIR_ := ${BUILDDIR:/=}/
endif

ifdef CUDABUILDDIR
CUDABUILDDIR_ := ${CUDABUILDDIR:/=}/
else
ifdef BUILDDIR_
CUDABUILDDIR_ := ${BUILDDIR_}
endif
endif


# The SRCFILES variable defaults to all source files within
# the project directory, however note that SRCFILES can be
# overridden in the project Makefile. Note that SRCFILES
# must be set *before* this file is included.
SRCFILES ?= $(shell find ${SRCDIR_}* -name "*.c"   \
                                 -or -name "*.cc"  \
                                 -or -name "*.cxx" \
                                 -or -name "*.cpp" \
                                 -or -name "*.cu")

# We need to define separate build rules for files in each
# source directory, so we pull out each source directory
# from the SRCFILES list. If $SRCDIR has been set, we
# exclude any directories not contained within it.
SRCDIRS := $(sort $(dir ${SRCFILES}))
SRCDIRS := $(filter ${SRCDIR_}%,${SRCDIRS})

# Now we get into the nitty gritty. We use a different
# naming convention for C/C++ and CUDA dependency
# files, to support projects which may have C++/CUDA
# source files with the same name, or which may compile
# the same file with different parameters for CPU / GPU
# execution.
#
# C/C++ dependency files end in .c.d, and CUDA dep files
# end in .cu.d.
#
# If a source file is contained within a sub-directory,
# the sub-directory is baked into the dependency file name
# (with slashes replaced by underscores).
#
# For example, a file "srcs/code.cpp" being compiled with
# g++ will have a dependency file named
# ".deps/srcs_code.cpp.c.d"
CDEPFILES  := $(addsuffix .c.d,       $(subst /,_,${SRCFILES}))
CUDEPFILES := $(addsuffix .cu.d,      $(subst /,_,${SRCFILES}))
CDEPFILES  := $(addprefix ${DEPDIR}/, ${CDEPFILES})
CUDEPFILES := $(addprefix ${DEPDIR}/, ${CUDEPFILES})
DEPFILES   := ${CDEPFILES} ${CUDEPFILES}

# Rule to make deps directory
${DEPDIR}:
	@mkdir -p ${DEPDIR}

# Define an empty rule for each dep file. In the compilation
# rules below, we list each dependency file as a prerequisite
# of the corresponding object file. But because the object
# and dependency files are created in a single step, Make would
# fail if the dependency file does not exist.
#
# However, by listing dependency files as targets with no
# prerequisites or commands causes Make to basically assume
# that they exist.
${DEPFILES}:

# This is where the auto dependency rules are actually applied -
# we include all dependency files that exist.
include $(wildcard ${DEPFILES})

# Rules for compilation. We define our own compilation rules
# which are equivalent to the implicit Make rules, but with
# some modifications to allow automatic dependency generation.

# Compiler flags for generating dependency files. These are
# added in the %.o compilation rules below.
CDEPFLAGS  = -MMD -MT $$@ -MF ${DEPDIR}/$$(subst /,_,$$<).c.d
CUDEPFLAGS = -MMD -MT $$@ -MF ${DEPDIR}/$$(subst /,_,$$<).cu.d

# Override implicit rules
%:   %.c
%:   %.cc
%:   %.cxx
%:   %.cpp
%:   %.c++
%.o: %.c
%.o: %.cc
%.o: %.cxx
%.o: %.cpp
%.o: %.c++
%.o: %.cu

# This canned recipe defines a rule for compiling a specific
# type of source file and saving the object file into a
# specific location. It has been carefully constructed to
# ensure that the compiler flags are not expanded until the
# rule is executed.
#
# The following arguments are passed:
# $1 source dir (or empty string)
# $2 full build dir (or empty string)
# $3 source suffix ("cpp", "cxx", etc)
# $4 dependency file suffix ("c" or "cu")
# $5 Name of compiler variable
# $6 Name of compiler flags variable
# $7 dependency flags

# This rule ensures the deps directory exists before anything
# is compiled, and lists the dependency file as a prerequisite
# of the object file so that if the dep file is missing, the
# object file will be re-built.
define gen_build_rule =
${2}%.o: ${1}%.${3} | ${DEPDIR}/$(subst /,_,${1})%.${3}.${4}.d ${DEPDIR} ${2}
	$$(eval COMPILER       := $$(value ${5}))
	$$(eval COMPILER_FLAGS := $$(value ${6}))
	$${COMPILER} $${COMPILER_FLAGS} ${7} -c -o $$@ $$<
endef

# This canned recipe defines rules for compiling source files
# located in a specific directory. Separate rules are required,
# because the build directory structure replicates the source
# directory structure. For example, the rule for files in the
# project root would be:
#
# build/%.o: %.cpp
#
# Whereas the rule for files in a sub-directory (let's say
# cuda/*.cu) would be:
#
# build/cuda/%.o: cuda/%.cu
#
# The following arguments are passed:
# $1 The source directory (or an empty string for pwd)
# $2 The source directory, with $SRCDIR stripped, for
#    projects which store sources in a subdirectory
define gen_build_rules =

# Define rules to create build directories
# (unless objects are being saved to pwd)
ifneq (${BUILDDIR_}${2},)
${BUILDDIR_}${2}:
	@mkdir -p $$@
endif

ifneq (${CUDABUILDDIR_},${BUILDDIR_})
ifneq (${CUDABUILDDIR_}${2},)
${CUDABUILDDIR_}${1}:
	@mkdir -p $$@
endif
endif

# Define rules to compile different types of source file
# Eddy uses g++ to compile .cpp files that are linked into
# a CUDA executble, so we define an additional rule here.
ifneq ($(wildcard ${1}*.cpp),)
$$(eval $$(call gen_build_rule,${1},${BUILDDIR_}${2},cpp,c,CXX,CXXFLAGS,$${CDEPFLAGS}))
ifneq (${CUDABUILDDIR}, ${BUILDDIR})
$$(eval $$(call gen_build_rule,${1},${CUDABUILDDIR_}${2},cpp,cu,CXX,CUDACXXFLAGS,$${CUDEPFLAGS}))
endif
endif

ifneq ($(wildcard ${1}*.cc),)
$$(eval $$(call gen_build_rule,${1},${BUILDDIR_}${2},cc,c,CXX,CXXFLAGS,$${CDEPFLAGS}))
endif

ifneq ($(wildcard ${1}*.cxx),)
$$(eval $$(call gen_build_rule,${1},${BUILDDIR_}${2},cxx,c,CXX,CXXFLAGS,$${CDEPFLAGS}))
endif

ifneq ($(wildcard ${1}*.c++),)
$$(eval $$(call gen_build_rule,${1},${BUILDDIR_}${2},c++,c,CXX,CXXFLAGS,$${CDEPFLAGS}))
endif

ifneq ($(wildcard ${1}*.c),)
$$(eval $$(call gen_build_rule,${1},${BUILDDIR_}${2},c,c,CC,CFLAGS,$${CDEPFLAGS}))
endif

ifneq ($(wildcard ${1}*.cu),)
$$(eval $$(call gen_build_rule,${1},${CUDABUILDDIR_}${2},cu,cu,NVCC,NVCCFLAGS,$${CUDEPFLAGS}))
endif
endef

# Generate build rules for each source directory
$(foreach SD_,${SRCDIRS},$(eval $(call gen_build_rules,${SD_:./%=%},$(patsubst ./%,%,${SD_:${SRCDIR_}%=%}))))


# Make sure that environment compiler flags are passed through
# to sub-makes. The _ENV* variables are defined in vars.mk
install:
	@mkdir -p ${FSLDEVDIR}
	@CXXFLAGS="${_ENVCXXFLAGS}"  \
	 CFLAGS="${_ENVCFLAGS}"      \
	 CPPFLAGS="${_ENVCPPFLAGS}"  \
	 LDFLAGS="${_ENVLDFLAGS}"    \
	 ${MAKE}                     \
	 "DESTDIR=${FSLDEVDIR}"      \
	  master-install-script


# The custominstall rule can be optionally
# defined in project Makefiles.
.PHONY: custominstall
master-install-script:
	@if [ "X${PROJNAME}X" = XX ] ; then \
		echo " " ; \
		echo "No PROJNAME defined in the Makefile" ; \
		echo "    ... aborting install" ; \
		echo " " ; \
		exit 4 ; \
	fi;
	@CXXFLAGS="${_ENVCXXFLAGS}"  \
	 CFLAGS="${_ENVCFLAGS}"      \
	 CPPFLAGS="${_ENVCPPFLAGS}"  \
	 LDFLAGS="${_ENVLDFLAGS}"    \
	 ${MAKE} all
	@${MAKE} exeinstall
	@${MAKE} hdrinstall
	@${MAKE} libinstall
	@${MAKE} tclinstall
	@${MAKE} pyinstall
	@${MAKE} datainstall
	@${MAKE} custominstall

# Generic routine used to install
# XFILES, PYFILES, SCRIPTS, etc etc
# Expects four arguments:
#  - $1: Label, just used to print a descriptive message
#  - $2: Destination directory for installation
#  - $3: Permission mask to apply to all installed files (e.g. 0755)
#  - $4: Space-separated list of target files/directories to install
define _x_install =
	if ! echo $(wildcard $(4)) | grep -q -e "^ *$$"; then \
		echo Installing $(1) ; \
		${MKDIR} -p -m 0755 $(2) ; \
	fi
	for target in $(4) verylongdummyname ; do \
		if [ -f $$target ] ; then \
			echo ${INSTALL} -m $(3) $$target $(2)/ ; \
			${INSTALL}      -m $(3) $$target $(2)/ ; \
		elif [ -d $$target ]; then \
			echo ${CP} -r $$target $(2)/ ; \
		 	${CP}      -r $$target $(2)/ ; \
		 	find $(2)/`basename $$target` -type d -exec chmod 0755 {} \; ; \
		 	find $(2)/`basename $$target` -type f -exec chmod $(3) {} \; ; \
		fi; \
	done;
endef

# Installs PYFILES into $FSLDIR/etc/fsl/python/$PROJNAME/
pyinstall:
	@${MKDIR} -p -m 0755 $(dest_PYDIR)
	@$(call _x_install,"python scripts",${dest_PYDIR}/${PROJNAME}/,0644,${PYFILES})

# Installs AFILES and SOFILES into $FSLDIR/lib/
libinstall:
	@${MKDIR} -p -m 0755 $(dest_LIBDIR)
	@$(call _x_install,"library files",${dest_LIBDIR},0644,${AFILES} ${SOFILES})

# Installs:
#  - HFILES into $FSLDIR/include/$PROJNAME/
#  - GLOBALHFILES into $FSLDIR/include/
hdrinstall:
	@${MKDIR} -p -m 0755 $(dest_INCDIR)
	@$(call _x_install,"header files",${dest_INCDIR}/${PROJNAME}/,0644,${HFILES})
	@$(call _x_install,"global header files",${dest_INCDIR}/,0644,${GLOBALHFILES})

# Installs DATAFILES into $FSLDIR/data/$PROJNAME/
datainstall:
	@${MKDIR} -p -m 0755 $(dest_DATADIR)
	@$(call _x_install,"data files",${dest_DATADIR}/${PROJNAME}/,0644,${DATAFILES})

# Installs:
#   - XFILES into $FSLDIR/bin/
#   - SCRIPTS into $FSLDIR/bin/
exeinstall:
	@${MKDIR} -p -m 0755 $(dest_BINDIR)
	@$(call _x_install,"binaries",${dest_BINDIR}/,0755,${XFILES})
	@$(call _x_install,"scripts",${dest_BINDIR}/,0755,${SCRIPTS})


# Installs:
#  - TCLFILES into $FSLDIR/tcl/
#  - RUNTCLS into $FSLDIR/bin/
tclinstall:
	@${MKDIR} -p -m 0755 $(dest_TCLDIR)
	@${MKDIR} -p -m 0755 $(dest_BINDIR)
	@$(call _x_install,"tcl scripts",${dest_TCLDIR}/,0755,${TCLFILES})
	@# create RUNTCLS links
	@for lntarget in ${RUNTCLS} verylongdummyname ; do \
		if [ $${lntarget} != verylongdummyname ] ; then \
			cd ${dest_BINDIR} ; \
			if [ ${SYSTYPE} != Darwin ] ; then \
				${RM} -f $${lntarget} ; \
				echo ln -s Runtcl $${lntarget} ; \
				ln -s Runtcl $${lntarget} ; \
			fi ; \
			${RM} -f $${lntarget}_gui ; \
			echo ln -s Runtcl $${lntarget}_gui ; \
			ln -s Runtcl $${lntarget}_gui ; \
		fi \
	done