Hi Leandro,
On 8/12/2009 8:46 AM, Leandro Lucarella wrote:
Hi. I would like to be able to include a generated file each time I run
make. I have a small script that generates some make rules. The file
should be generated *always*, and the results of the file should be
included by make.
I tried something like this:
file:
./gen_file
include file
.PHONY: file
But it doesn't work. It seems that make first includes the (old) file,
then regenerate it. I tried to add a rule like Makefile: file to tell make
to remake the Makefile itself when "file" is changed but it doesn't work
either.
This usually works with "automatic dependencies", so I guess there should
be any way to get arround, but I tried and tried and came up with nothing.
First, you'll probably want to use sinclude, rather than include, as
include will fail the build if the file is missing, which it will be the
first time around. The way make works is to read the makefile, including
whatever it's told to, new, old, or non-existent. Then it follows the
rules to update these files. Any targets with the makefile as a
dependency are updated first. If any of them must be rebuilt, then make
rebuilds them (or executes the commands for those rules) and then -- and
here's the magic -- it restarts the whole make process again.
- - - - - - - - - - - -
file:
./gen_file
Makefile: file
sinclude file
- - - - - - - - - - - -
Don't use .PHONY on file. It's a real file, so you should tell make it's
not, as it will get confused.
Regards,
John
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