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Message-Id: <20100612.111805.94843338670897167.imp@bsdimp.com>
To: jroberson@jroberson.net
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: arch@FreeBSD.org
Subject: Re: Change to config(8) for OFED
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In message: <20100612.101458.10150326125744273.imp@bsdimp.com>
            "M. Warner Losh" <imp@bsdimp.com> writes:
: In message: <alpine.BSF.2.00.1006111611380.1435@desktop>
:             Jeff Roberson <jroberson@jroberson.net> writes:
: : I have a patch to permit compilation of files brought in from linux
: : that use the same name in multiple directories.  I added a new
: : directive called 'obj-prefix' which expects a quoted string that will
: : be prepended to the object file name.  The problem is that this breaks
: : ${.IMPSRC}
: 
: So foo_bar.o depends on bar.c?  And ${.IMPSRC} expands to foo_bar.c?
: 
: : I could also emit the source file name for those rules which are
: : created with prefixes and then require each file that uses a prefix to
: : also use compile-with.  This wouldn't be so bad since they likely are
: : already using compile-with anyway.
: 
: You'll have to emit compile rules, I think.

Ideally, you'd be able to emit:

foo_bar.o: $S/path/to/file/bar.c
	${NORMAL_C}
	@${NORMAL_CTFCONVERT}

but NORMAL_C is

NORMAL_C= ${CC} -c ${CFLAGS} ${WERROR} ${PROF} ${.IMPSRC}

and .IMPSRC is null.  That seems like a bug to me, but I'm not sure if
the bug is that .IMPSRC is computed wrong, or if it really should be
${.ALLSRC}

Warner