# 2003-05-16 Per Mildner qpsupport@sics.se
#
# Make a C or C++ run-time system that calls Prolog and where Prolog
# can call back into the executable.


# This make file assumes GNU make and GCC
#
# Quintus Prolog tools (qld, qpc) are assumed to be in the PATH, if
# not, set QLD and QPC make variables.

## Interesting make targets:
## check         -- Build everything and run the test program
## all           -- Build everything
## clean         -- remove all generated files

## Interesting make variables:
## C_DIALECT     -- c or cpp (lowercase) for C or C++ respectively, You need to do make clean first.
## 

## Examples:
## Make everything as C code and run check
##   make clean check C_DIALECT=c
##
## Make everything as C++ code and run check
##   make clean check C_DIALECT=cpp

#####################################################################################

# default target
.PHONY: default
default: all


# c or cpp to use C or C++ respectively
C_DIALECT = c

##### C compiler specifics

CC = gcc

# Flags for compiling for shared opjects (e.g., enable Position
# Independant Code)
PIC = -fPIC

# Flags for $(CC) to turn on appropriate warnings
C_WARNING_OPTS = -Wall -Werror


#################################################################

QPC = qpc
QLD = qld

QPC_VERBOSE = -v
QLD_VERBOSE = -v

#################################################################

SED = sed

#################################################################
# QP paths, use qld -P to get search paths

# QP installation dir
QP_DIR = $(shell $(QLD) -P quintus | $(SED)  -e 's/^.*:.*://')

# There is no direct way to get the include directory but 'messages' are in the same folder.
QP_INCLUDE_DIR = $(shell $(QLD) -P messages | $(SED)  -e 's/^.*:.*://')

QP_RUNTIME_DIR = $(shell $(QLD) -P runtime | $(SED)  -e 's/^.*:.*://')

QP_LIBRARY_DIR = $(shell $(QLD) -P library | $(SED) -n -e 's/^.*:qplib(library)://p')

# First line (the most specific) of system path
QP_SYSTEM = $(shell $(QLD) -p system | $(SED) -e 's/^.*://' -e 'q')

QP_LIBRARY_SYSTEM_DIR = $(QP_LIBRARY_DIR)/$(QP_SYSTEM)

QP_INCLUDE_FLAGS = "-I$(QP_INCLUDE_DIR)"

OS_LIBS = -lm -ldl

QP_LIBS = $(QP_RUNTIME_DIR)/qprte.o $(QP_RUNTIME_DIR)/libqp.a $(QP_LIBRARY_SYSTEM_DIR)/libplm.a

#################################################################

DDEBUG = -DDEBUG

CFLAGS += $(C_WARNING_OPTS)

CPPFLAGS += $(DDEBUG) $(QP_INCLUDE_FLAGS)

##################################################################################

PROLOG_SOURCES = testmodule.pl
FOREIGN_FILES = myforeign.o



.PHONY: all
all: myapp


.PHONY: check
# Use explicit directory part since current directory may not be first on PATH if at all
check: myapp
	$(<D)/$(<F) || { echo "Execution of $< exited with error $$?"; exit 1; }

# -c to generate a .qof file and not an executable
my_pl_code.qof: $(PROLOG_SOURCES) $(FOREIGN_FILES)
	$(QPC) -c $(QPC_VERBOSE) -o $@ $(filter-out %.o, $^)

# -c to generate a .o file and not an executable
# -d to link in dependancies (other needed qof files)
my_pl_code.qof.o: my_pl_code.qof
	$(QLD) -c -d $(QLD_VERBOSE) -o $@ $^

myapp.o: myapp.$(C_DIALECT)
	$(CC) $(CFLAGS) $(CPPFLAGS)  $^ -c -o $@

myforeign.o: myforeign.$(C_DIALECT)
	$(CC) $(CFLAGS) $(CPPFLAGS) $(PIC) $^ -c -o $@


# We create the C++ sources by simply copying the C sources and making them read-only
%.cpp : %.c
	echo "// This file was generated from $<, it will be deleted by make clean!!" > $@
	cat $< >> $@
	chmod a-w $@


myapp : myapp.o myforeign.o my_pl_code.qof.o
	$(CC) $^ -o $@ $(QP_LIBS) $(OS_LIBS)

.PHONY: clean
clean:
	rm -f *.o *.qof myapp
	rm -f myforeign.cpp myapp.cpp