View source for Using C libraries for a D program

'''WARNING:  This crude recipe by an absolute D newbie has not yet been tested--corrections are welcome!'''

Assume one has the following, error-free files:

* a D language source program: 
::'''./main.d'''

* a C ABI library file: 
::'''/usr/local/lib/libbu.so'''

* a D language binding source file to the C library API headers:
::'''/usr/local/include/bu.d'''

We first create a GNU Makefile to build program '''test-bu''' using those three files (note the leading spaces on lines following targets must be tabs in a real GNU Makefile):

<pre>$ cat Makefile
# use the dmd compiler
DMD = /usr/bin/dmd

LIBDIR = /usr/local/brlcad/lib
MODDIR = /usr/local/brlcad/include

BINDING = $(MODDIR)/bu.d

all: test-bu

test-bu: main.o bu.o
        $(DMD) -o $@ main.o bu.o -L$(LIBDIR) -lbu
 
%.o: %.d
        $(DMD) -c $< -o $@

bu.o: $(BINDING)
        $(DMD) -c $< -o $@

clean:
        -rm *.o</pre>

Then we can build '''test-bu''' by executing:

<pre>$ make test-bu</pre>

The GNU Makefile can be made more general and efficient, but it should produce the desired binary program.  

Note also that a fully D-supporting C library installation would probably have the D binding source available as a pre-compiled *.o file.