Hello,
I'm experimenting parallel build with GNU Make 3.81 on Debian Sid.
I've seen that "build order change" depending on -j flag. I know I'm
missing something but could not figure it out. so hope someone give me
a pointer to doc.
here is my makefile:
all: 1.pdf 2.pdf 3.pdf
@echo Making $@
%.pdf: %.fo
touch $@
%.fo:
touch $@
and the outputs:
$ make -j 1
touch 1.fo
touch 1.pdf
touch 2.fo
touch 2.pdf
touch 3.fo
touch 3.pdf
Making all
rm 1.fo 2.fo 3.fo
$ make -j 2
touch 1.fo
touch 2.fo
touch 3.fo
touch 1.pdf
touch 2.pdf
touch 3.pdf
Making all
rm 1.fo 2.fo 3.fo
see that with "-j1", the order is interleaved. but with "-j2", all fo
is created first and then pdf. it does not seems to matter if I
increase either a number of pdf (say 1 to 10.pdf) or -j10. except
-j1, if you enabled parallel build, make build all .fo then goes on to
.pdf.
so, what I am missing? is there implicit rule I have to take care?
TIA,
--
yashi
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