Technically, I'm not sure what the output should be since the order in which the dependencies
will be made is undefined. This is clearer to see if you consider that "-j" can be
used.
Here's a better-defined makefile:
$ cat GNUmakefile
def = $(wildcard *.aoeu)
imm := $(wildcard *.aoeu)
.PHONY: main
main: t2
.PHONY: t2
t2: clean
ls *.aoeu
@echo "wildcard = $(wildcard *.aoeu)"
@echo "imm = $(imm)"
@echo "def = $(def)"
.PHONY: clean
clean: t1
rm *.aoeu
.PHONY: t1
t1: touch
ls *.aoeu
@echo "wildcard = $(wildcard *.aoeu)"
@echo "imm = $(imm)"
@echo "def = $(def)"
.PHONY: touch
touch:
touch aoeu.aoeu
$ gmake
touch aoeu.aoeu
ls *.aoeu
aoeu.aoeu
wildcard =
imm =
def =
rm *.aoeu
ls *.aoeu
ls: *.aoeu: No such file or directory
gmake: *** [t2] Error 1
Judging from the above, what Paul said about the wildcard caching is the most
likely suspect.
Noel
Robert P. J. Day wrote:
On Thu, 27 May 2004, Noel Yap wrote:
':=' evaluates the RHS at the time of the assignment. '=' evaluates the
RHS at the time of actual use.
but in my original post, i did mention that my tests seemed to show no
difference. here's a sample makefile i used, in a directory with at least
a couple of .o files:
--------------------
.PHONY: main t1 t2 clean
imm := $(wildcard *.o)
def = $(wildcard *.o)
main: t1 clean t2
t1:
@echo imm = ${imm}
@echo def = ${def}
clean:
rm *.o
t2:
@echo imm = ${imm}
@echo def = ${def}
---------------------
this is invoked in a directory with some object (*.o) files. based on
what you just said, what do you expect as the output? i got the
following:
imm = a.o b.o
def = a.o b.o
rm *.o
imm = a.o b.o
def = a.o b.o ????? why?
given that "def" was a deferred assignment, i would have thought that
its second value would be the empty string since, at the "time of actual
use", as you put it, there are no .o files left.
or am i misreading something?
rday
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