Paul D. Smith writes:
> cb> The Makefile looks like (as simple as possible):
>
> cb> LIST = file.out1 file.out2
>
> cb> all: $(LIST)
>
> cb> %.out1 %.out2: %.source
> cb> cat $< > $@
>
> You're building only $@ here. $@ is set to whatever target caused
> this rule to be invoked.
I agree $@ matches only one thing at a time.
Let's say I do the following with the same Makefile :
$ make file.out1
cat file.source > file.out1
$ make file.out2
cat file.source > file.out2
It will build two files using the same target. I expect "make all" to
build the files in $(LIST): to do the same thing as:
$ make file.out1 file.out2
If I do it in two step, it works, if I do it in one step, it fails :
$ make file.out1 file.out2
cat file.source > file.out1
make: Nothing to be done for `file.out2'.
But if I do it again (file.out1 is already built).
$ make file.out1 file.out2
make: `file.out1' is up to date.
cat file.source > file.out2
??
I'm doing this to avoid writing two distint rules because they build
files the same manner. Let's imagine the following Makefile :
LIST = file.out1 file.out2
all: $(LIST)
%.out1: %.source
cat $< > $@
%.out2: %.source
cat $< > $@
--
Now I do :
$ make all
cat file.source > file.out1
cat file.source > file.out2
It works.
I don't want my script to build several files at a time, I want make
to call my script several times with different arguments.
Do you see what I mean ? (I'm sorry for my poor english).
> IOW, your rule says that the script will build two targets, but
> your script only builds one.
My rule only say that make matches it when you build *.out1 or
*.out2. It's nearly as if I was doing :
file.out1 file.out2: file.source
cat $< > $@
$@ will match file.out1 OR file.out2. So if I do
$ make file.out1 file.out2
it will build both files.
This will work but the filename is hardcoded, it won't allow to
$ make whateveryouwant.out{1,2}
> If your script doesn't build what your makefile told make it would,
> then make is not going to work the way you expect.
The script make invokes is doing what make expects : building one file
from one source.
Is there a problem with putting two "%" in one target ?
--
Cyril Bouthors mailto:[EMAIL PROTECTED]
phone:+33 1 55 26 58 85
fax:+33 1 55 26 59 00
