Hi,
This is a long-standing bug in bjam and many build systems. The issue
is that it analyzes the current build graph, checks that timestamps are
consistent with that graph, and assumes the files match the current
build if so. If you had a Makefile, ran make, edited the Makefile to
change commands, and ran make again, it would think the build is complete.
It started causing trouble when people built with one set of language
models then built with another, so I put a kludge in that saves the
relevant command line options to a file and forces a rebuild.
In response to your mail, I factored the kludge into a function.
Please git pull then look at the tail end of moses/src/LM/Jamfile:
path-constant LM-LOG : bin/lm.log ;
local current = ;
for local i in srilm irstlm randlm {
local optval = [ option.get "with-$(i)" ] ;
if $(optval) {
current += "--with-$(i)=$(optval)" ;
}
}
current = $(current:J=" ") ;
current ?= "" ;
always-if-changed $(LM-LOG) $(current) : Factory.o LM ;
You can also look at the end of jam-files/sanity.jam .
Kenneth
On 07/02/2012 11:33 AM, Ales Tamchyna wrote:
> Hi,
>
> we are implementing phrase sense disambiguation in Moses, which requires
> linking it with Vowpal Wabbit. We have been struggling with bjam,
> encountering a bunch of random errors and unexpected behavior:
>
> * bjam seems to ignore changes sometimes, it only says "found X
> targets...", but doesn't update (yet the moses binary timestamp changes
> -- it doesn't include the new modifications though).
>
> * It seems that the final build is sometimes erroneous, resulting in
> random crashes in places that have nothing to do with the code changes I
> made (removing all 'bin' directories and doing bjam -a seems to help).
>
> * It looks like I was able to get rid of these errors by removing all
> occurrences of #ifdef HAVE_VW and #endif from my code (but now normal
> users can't build this branch).
>
> I'm wondering if a bjam expert (Ken? :) could take a look at the
> attached Jamfile and let me know if I did something wrong. My code is in
> the damt_phrase branch.
>
> Thanks!
>
> Ales Tamchyna
>
>
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