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From: jc@minya.UUCP (John Chambers)
Newsgroups: comp.unix.wizards
Subject: Re: sources in a heterogenous enviroment
Message-ID: <121@minya.UUCP>
Date: Thu, 20-Aug-87 20:58:15 EDT
Article-I.D.: minya.121
Posted: Thu Aug 20 20:58:15 1987
Date-Received: Sat, 22-Aug-87 14:20:49 EDT
References: <390@sdics.ucsd.EDU>
Organization: home
Lines: 35
Summary: Yeah, use multiple directories...

In article <390@sdics.ucsd.EDU>, wallen@sdics.ucsd.EDU (Mark Wallen) writes:
> With all the discussion about how to handle binaries
> for different processors in a heterogenous NFS environment,
> I have a related question.  How do you folks handle
> your source files?  

This comes up all the time in places where you have to do cross-compiling
for multiple target machines.  There are two solutions.  Both of them
involve putting your source in one directory, say ".../src", and having
other parallel directories for compilation.  Say you are compiling for
machines "foo" and "bar".  You have the directories:
	.../src
    .../foo
	.../bar
To compile for foo, you cd to .../foo, where there is a makefile with
entries like:
	blech.o: blech.c; cc $(CFLAGS) -O blech.c
	blech.c: ../src/blech.c; ln .../src/blech.c .
Alternatively, you can take advantage of the fact that many C compilers
put their .o files into the current directory by default, even if the
source is off somewhere else.  If your compiler for foo acts this way, 
you can simply say:
	blech.o: ../src/blech.c; cc $(CFLAGS) -O ../src/blech.c
and all will work just fine.  In both cases, of course, CFLAGS contains
the stuff to customize the software for the foo processor.

There's no way to avoid multiple .o files, but by doing links or remote
compiles, you at least avoid having multiple source files.  (Unless the
src directory is on another file system, in which case you lose! :-)

To get really clever, you can put a makefile in the ... directory that
knows how to cd to each subdirectory and make all.

-- 
	John Chambers <{adelie,ima,maynard}!minya!{jc,root}> (617/484-6393)