CC          = cc
SRCPATH     = src
LIBPATH     = lib
BINPG       = pg
BINMY       = my
SRCPG       = $(BINPG).c
SRCMY       = $(BINMY).c
LIBOBJS     = usage.o commandline.o mode.o
LIBPGMY     = libpgmy.a

# VPATH: Search Path for All Prerequisites
# http://www.gnu.org/software/make/manual/html_node/General-Search.html#General-Search
VPATH       = src:lib

# "make OPT=0" from the command line skips the optimizer flag -O2, recommended when using gdb.
ifeq ($(strip $(OPT)),0)
CFLAGS      =-g -ansi -pedantic -Wall
else
CFLAGS      =-g -ansi -pedantic -Wall -O2
endif
export CFLAGS

LDFLAGS     = -L./$(LIBPATH)
LIBS        = -lpgmy -mwindows

# Syntax of Static Pattern Rules
# http://www.gnu.org/software/make/manual/html_node/Static-Usage.html#Static-Usage
# See also:
# Pattern Rule Examples
# http://www.gnu.org/software/make/manual/html_node/Pattern-Examples.html#Pattern-Examples
.PHONY: all
all: lib $(SRCPG) $(SRCMY)
        $(CC) $(LDFLAGS) $(SRCPATH)/$(SRCPG) -o $(BINPG) $(LIBS)
        $(CC) $(LDFLAGS) $(SRCPATH)/$(SRCMY) -o $(BINMY) $(LIBS)

.PHONY: lib
lib: $(LIBPATH)/$(LIBDB)

# $@ = the target (in lib/), $^ = the prerequisites (in src/)
$(LIBPATH)/$(LIBDB): $(LIBOBJS)
        $(AR) $(ARFLAGS) $@ $(addprefix $(SRCPATH)/,$^)

$(LIBOBJS): %.o: %.c
        $(CC) -c $(CFLAGS) $< -o $(SRCPATH)/$@

.PHONY: clean
clean:
        rm -rf $(BINPG) $(BINMY) $(BINPG).exe $(BINMY).exe $(SRCPATH)/*.o *core *~

.PHONY: libclean
libclean:
        rm -rf $(LIBPATH)/$(LIBDB)