Hi Shachar,
On Sat, Feb 23, 2013 at 06:57:27AM +0200, Shachar Shemesh wrote:
>
> What I'm also interested in is why .SECONDARY made everything slow.
I've put a cut-down makefile demonstrating this here:
http://urchin.earth.li/~ian/tmp/Makefile
First run
$ make setup
(which creates some directories and touches some files).
Then
$ time make -nr D
make: *** No rule to make target `compiler/stage1/build/Name.hi-boot',
needed by `compiler/stage1/build/Binary.o'. Stop.
make -nr D 11.48s user 0.01s system 100% cpu 11.493 total
Interesting also is
$ time make -nr A
make: *** No rule to make target `compiler/stage1/build/Name.hi-boot',
needed by `compiler/stage1/build/Binary.o'. Stop.
make -nr A 28.55s user 0.00s system 100% cpu 28.552 total
i.e. a lot slower than making D, despite appearing to require very
little extra work.
Comment out the ".SECONDARY:" and:
$ time make -nr D
make: *** No rule to make target `compiler/stage1/build/Name.hi-boot',
needed by `compiler/stage1/build/Binary.o'. Stop.
make -nr D 0.03s user 0.00s system 97% cpu 0.033 total
$ time make -nr A
make: *** No rule to make target `compiler/stage1/build/Name.hi-boot',
needed by `compiler/stage1/build/Binary.o'. Stop.
make -nr A 0.03s user 0.00s system 97% cpu 0.033 total
I can reproduce the slowness with both 3.81 and a recent git checkout.
(in fact, recent git seems to be slightly slower).
Thanks
Ian
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