topic Re: Question about MAKE utility in Operating System - HP-UX

Question about MAKE utility

Wojtek Dudczak — Thu, 01 Aug 2002 13:29:22 GMT

Hi all,

Make has double suffix interference rule .cpp.o for building .o files from .cpp files. This rule looks like:

.cpp.o
$(CXX) $(CXXFLAGS) -c $<

But this rue produces .o file in the same directory where .cpp source file is located, and works only when .o and .cpp are in the same directory. Is it possible to define similiar rule, that will allow me to have source code and object files in separate directories?

Thank You in advance

Re: Question about MAKE utility

Ceesjan van Hattum — Thu, 01 Aug 2002 13:39:52 GMT

As i can see in 'man make', it is possible to execute multiple commands in a rule; like:

.y.o:
$(YACC) $(YFLAGS) $<
$(CC) $(CFLAGS) -c y.tab.c
rm y.tab.c
mv y.tab.o $@

So, can you try to do:
.cpp.o
$(CXX) $(CXXFLAGS) -c $<
mkdir ./newdir
mv *.o ./newdir/

Please let me know your findings..
Regards,
Ceesjan

Re: Question about MAKE utility

Tom Maloy — Thu, 01 Aug 2002 15:04:35 GMT

You may need to use nmake or gmake, or try to write some of your own inference rules.

Note that Ceesjan's solution will cause you to do a rebuild of every *.cpp file every time you run make, because make will not look in the directory where the *.o files are.

Tom

Re: Question about MAKE utility

H.Merijn Brand (procura — Thu, 01 Aug 2002 15:08:14 GMT

rules always end with a colon (':') in all versions and ports of make. I guess that your real makefile indeed has

.cpp.o:

with a colon.

A much better make is the GNU make. Binaries are available from a HP porting center or from https://www.beepz.com/personal/merijn

Re: Question about MAKE utility

Wojtek Dudczak — Fri, 02 Aug 2002 06:28:00 GMT

Ceesjan were right, but as Tom said: this solution would cause to rebuild all .cpp files every time make is launched. And of course I omitted colon in my example by mistake.

Thank you guys for your assistance.

Wojtek

Re: Question about MAKE utility

Sergiy Nevstruyev — Fri, 02 Aug 2002 07:26:12 GMT

Hi Wojtek,

you can try to use the following one. Looks ugly but works :-).

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

OD = ./obj
OD_OBJS = $(OD)/test.o
OBJS = test.o

main: moveobjs $(OBJS) removeobjs

moveobjs:
cp $(OD_OBJS) . || echo ""

.c.o:
gcc -o $(OD)/$@ -c $<

removeobjs:
rm $(OBJS)

Re: Question about MAKE utility

Ian Lochray — Fri, 02 Aug 2002 08:39:21 GMT

Stefan Paitoni has answered this in another thread. The solution is:

VPATH=:

.cpp.o :
...

Re: Question about MAKE utility

Wojtek Dudczak — Fri, 02 Aug 2002 12:26:23 GMT

Best solution was with VPATH

Thanks again