HELP! $(wildcard ) function failed very strangely

========================================================
all: first_target
outfile = out.txt
$(outfile):
  ; &nbsp;echo nnn > $
.PHONY: prj_count
prj_count: 
 &nbsp; &nbsp;echo "[[$(outfile)]] <<$(wildcard $(outfile))>> "

.PHONY: first_target
first_target: $(outfile) prj_count
  ; &nbsp;echo "[DONE]"
========================================================
[[out.txt]] <<&gt;>
[DONE]
¡¡¡¡
[[out.txt]] <<out.txt>&gt;
[DONE]

On 2007-09-30 16:54:28 (+0800), Chen Jun (????)
<chenjunmail.nlscan.com> wrote:
> Result of the first run is strange. When target
prj_count is being made,
> out.txt should have been generated on my disk(because
$(outfile) had been made
> before), then WHY $(wildcard out.txt) gives me null
result ?
The $(wildcard ) is evaluated when the rule is parsed, not
when it's
executed. At that point the out.txt file doesn't exist yet
so it doesn't
match anything.

Try something like this:

MATCH = $(wildcard out.txt)
rule: out.txt
    echo $(MATCH)

out.txt:
    touch $ 

Also note that it's a bad idea to rely on the order or your
prerequisites, as you seem to do in first_target. If make is
executed
with -j it's possible the prj_count target will be executed
before the
$(outfile) target. If prj_count requires $(outfile) to be
built it
should be listed as a prerequisite.

Regards,
Kristof

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HELP! $(wildcard ) function failed very strangely

Thread: HELP! $(wildcard ) function failed very strangely