# Generic Makefile for one or more executable programs that test a library
# Last edited on 2016-12-26 21:44:05 by stolfilocal

######################################################################
# To be included by the top-level Makefile in the program's directory.
# The client must define 
#
#   ${TEST_LIB}          the library under test (WITH extension, WITHOUT dir).
#   ${TEST_LIB_DIR}      directory with latest sources and headers of ${TEST_LIB}.
#   ${PROG} or ${PROGS}  test programs (whose main C sources are in current directory).
#
# The client may also define:
#   
#   ${IGNORE}         list of ".h" or ".c" files that should not be compiled.
#   ${USE_GL}         define as `YES' to bind with the GL headers and libraries.
#   ${USE_X11}        define as `YES' to bind with the X11 headers and libraries.
#   ${OTHER_LIBS}     list of additional libraries (WITH directories).
#   ${OTHER_I_FLAGS}  additional -I flags for C compilation and dependency checks.
#   ${OTHER_C_FLAGS}  additional flags for C compilation.
#   ${OTHER_LD_FLAGS} additional flags for linking.
#   
# All library names must include the extension (".a", ".so", etc.)
# The client must define the "all" target.
# The client may extend the "clean" target with double-colon rules.

include GENERIC.make

.PHONY:: rebuild-test-lib

ifeq "/${PROGS}" "/"
PROGS := ${PROG}
endif

ifneq "/${PROGS}" "/"
ifneq "/${TEST_LIB}" "/"
ifneq "/${TEST_LIB_DIR}" "/"

# ----------------------------------------------------------------------
# Package components and directories

# Location of headers of the library under test:
TEST_INC_DIR := ${TEST_LIB_DIR}

# Get list of all local ".h" files, and their derived objects:
HFILES := ${filter-out ${IGNORE}, ${wildcard *.h}}
HOFILES := ${subst .h,.ho,${HFILES}}

# Get list of all local ".c" files (including the main sources of ${PROGS}):
CFILES := ${filter-out ${IGNORE}, ${wildcard *.c}}
OFILES := ${subst .c,.o,${CFILES}}

# Get list of ".c" files of good main programs and their objects:
PROG_CFILES := ${addsuffix .c,${PROGS}}
PROG_OFILES := ${subst .c,.o,${PROG_CFILES}}

# Get list of non-main ".c" files and objects:
LIB_CFILES := ${filter-out ${PROG_CFILES} ${IGNORE}, ${CFILES}}
LIB_OFILES := ${subst .c,.o,${LIB_CFILES}}

# ----------------------------------------------------------------------
# Optional libraries and include directories
  
# Get OpenGL libraries and headers if requested:
ifeq "/${USE_GL}" "/YES" 
  GL_LIBRARIES := \
    /lib64/libGLU.so \
    /lib64/libGL.so
  GL_I_FLAGS := \
    -I /usr/include/GL
else
  GL_LIBRARIES :=
  GL_I_FLAGS := 
endif

# Get X11 libraries and headers if requested:
ifeq "/${USE_X11}" "/YES" 
  X11_LIBRARIES := \
    ${X11_LIB_DIR}/libX11.so \
    ${X11_LIB_DIR}/libXext.so \
    ${X11_LIB_DIR}/libXmu.so.6 \
    ${X11_LIB_DIR}/libXt.so.6 \
    ${X11_LIB_DIR}/libXi.so.6 \
    ${X11_LIB_DIR}/libSM.so.6 \
    ${X11_LIB_DIR}/libICE.so.6
  X11_I_FLAGS :=  -I${X11_INC_DIR}
else
  X11_LIBRARIES := 
  X11_I_FLAGS := 
endif
  
#---------------------------------------------------------------------
# Default target for "make" with no target: 

all: rebuild-test-lib build-progs check

#---------------------------------------------------------------------
# "make actions" performs the ${ACTIONS} locally:

actions:
ifeq "/${ACTIONS}" "/"
	@echo '$${ACTIONS} is empty'
else
	${MAKE} ${ACTIONS}
endif
  
#---------------------------------------------------------------------
# Directories to search for #include files:

I_FLAGS := \
  -I. \
  -I${TEST_INC_DIR} \
  ${GL_I_FLAGS} \
  ${X11_I_FLAGS} \
  ${OTHER_I_FLAGS}

#---------------------------------------------------------------------
# "make depend" recreates the source dependency file ${DEPFILE}.

DEPFILE := Deps.make

depend: ${DEPFILE}

${DEPFILE}: ${HFILES} ${CFILES}
	@/bin/rm -f ${DEPFILE}
	@extract-ho-deps ${I_FLAGS} -I/usr/include \
            ${HFILES} ${CFILES} \
          | egrep -v ': /usr/include' \
          > ${DEPFILE}

#---------------------------------------------------------------------
# "make build-libs" is void because any local modules and libs will be built 
# together with the programs:

build-lib:
build-libs:
        
#---------------------------------------------------------------------
# "make rebuild-test-lib" remakes the test library:

rebuild-test-lib: ${TEST_LIB_DIR}
	cd ${TEST_LIB_DIR} && ${MAKE} ${TEST_LIB}

#---------------------------------------------------------------------
# "make build" and "make build-progs" make sure that the ${DEPFILE} is
# up to date, and then recreate the object files from the source files
# as necessary.

build: build-progs
build-tests: build-progs
  
build-progs: ${DEPFILE}
	${MAKE} do-build-progs

do-build-progs: ${PROGS}

LIBRARIES := \
  ${TEST_LIB_DIR}/${TEST_LIB} \
  ${GL_LIBRARIES} \
  ${X11_LIBRARIES} \
  ${OTHER_LIBS}

%.o: %.c
	${CC} -c ${C_FLAGS} ${OTHER_C_FLAGS} ${I_FLAGS} $*.c
  
%.ho: %.h
	${CC} -o $*.ho -c ${C_FLAGS} ${OTHER_C_FLAGS} ${I_FLAGS} -x c $*.h \
          || /bin/rm -f $*.ho
  
${PROGS}: ${PROG_OFILES} ${LIB_OFILES} ${LIBRARIES}
	@echo '# - - - - - - - - - - - - - - - - - - - - - - - - - - - - -'
	@echo building $@ ...
	-rm -f $@
	${CC} -o $@ ${LD_FLAGS} ${OTHER_LD_FLAGS} $@.o \
          ${LIB_OFILES} \
          ${LIBRARIES} -lm -lrt
	@echo '# - - - - - - - - - - - - - - - - - - - - - - - - - - - - -'

ifneq "/${wildcard ${DEPFILE}}" "/"
  # Include specific dependencies extracted by "make depend"
  include ${DEPFILE}
endif

#---------------------------------------------------------------------
# "make clean" deletes all derived files.
# It is a double-colon rule so that clients may add more actions.
# Also recreates the ".deps" file.

clean::
	-/bin/rm -f *.o *.ho *.a core ${PROGS} *.deps ${DEPFILE}
	${MAKE} depend

endif
endif
endif
# End of ${PROG} ${TEST_LIB} ${TEST_LIB_DIR} section.
######################################################################

#---------------------------------------------------------------------
# "make debug" prints some debugging info:
debug:
	@echo "TEST_LIB = ${TEST_LIB}"
	@echo "TEST_LIB_DIR = ${TEST_LIB_DIR}"
	@echo "PROG = ${PROG}"
	@echo "PROGS = ${PROGS}"