On Mon, 21 Jun 2010, Garrett Wollman wrote:
In article
<mit.lcs.mail.freebsd-bugs/201006210044.o5l0ipxk000...@www.freebsd.org>,
gcoo...@freebsd.org writes:
>foo: bar
> @echo target: $@ prereq: $<
>$ make -f ~/Makefile.prereq foo
>target: foo prereq:
This doesn't look like a POSIX makefile (IIRC the original mail shows
a cat command to show the whole makefile). A POSIX makefile must begin
with a .POSIX special target. See sys.mk. The POSIX support in sys.mk
probably doesn't actually work right, but that is another bug. (Most
recently I noticed breakage of the POSIX mandated rules by encrufting
them with CTFCONVERT shell commands.)
>The above invocation should have printed out:
>
>target: foo prereq: bar
No. $< is only defined for pattern rules.
>$<
> In an inference rule, the $< macro shall evaluate to the filename
>whose existence allowed the inference rule to be chosen for the target.
>In the .DEFAULT rule, the $< macro shall evaluate to the current target
>name. The meaning of the $< macro shall be otherwise unspecified.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Strange wording. It commands itself the not specifiy something that it
doesn't specify. Anyway, this means that the makefile is more non-POSIX
than just its missing .POSIX.
Bruce
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