Date: Thu, 03 Apr 2003 23:39:03 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Pawel Jakub Dawidek <nick@garage.freebsd.pl> Cc: Marcel Moolenaar <marcel@xcllnt.net> Subject: Re: Bug in make(1)? Message-ID: <3E8D3697.3EC98625@mindspring.com> References: <20030403212300.GL54604@garage.freebsd.pl> <20030404071346.GN54604@garage.freebsd.pl>
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Pawel Jakub Dawidek wrote:
> On Thu, Apr 03, 2003 at 01:50:59PM -0800, Marcel Moolenaar wrote:
> +> Because you told make(1) to by virtue of including bsd.prog.mk
> +>
> +> OBJS is derived from SRCS by replacing the extension. If SRCS
> +> contains foo/bar.c, OBJS will contain foo/bar.o...
>
> Yes, but take a look on compilation process. When file is compilated
> '-o' isn't specified (gcc -c test/tst.c), but when executable file is
> produced, gcc looks for tst.o in test directory (gcc -o tst test/tst.o).
> And IMHO if gcc want to look for objects somewhere it should put them
> there, so: gcc -o test/tst.o -c test/tst.c. Sometimes it is hard to
> change.
The real problem is that the object directory is often intentionally
not the source directory. The libc_r build procedure works this way.
You don't want to list source objects by path; you want to use
subdir Makefile's, and the constructs that are there to support
obtaining sources from alternate directories.
You should look at the ".PATH:" directive. For the "test/tst.c"
case, probably the correct thing to do is use something like:
.PATH: ${.CURDIR}/test
...
# source files from test/*; if names collide, you should be
# using a library, instead of compiling direct subdir sources
SRCS+= tst.c
...
.include <bsd.prog.mk>
This will cause tst.o to both be crated, and referenced, from the
directory in which the Makefile resides, instead of mixing references
to the subdirectory "test".
FWIW: I've been annoyed by the behaviour, as well; however... I
understand how, if one is using an OBJDIR, that using subdirectories
below the directories, without sub-Makefiles to create the objects,
could make the build system parallel object directory creation fail.
-- Terry
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