Hi,
I work on a large project that has 160 Tupfiles for 20k C++ source
files that needs to be tested for portability across more than 30
C++ compiler versions, 20 Boost versions, and many other
dependencies. My practice is to install each dependency in its own
version-specific installation prefix, and thus changing
dependencies causes tup to rebuild affected artifacts because the
compiler paths and/or switches change. I'm switching between
dependencies on a daily basis and have never missed tup's lack of
a "clean", although my setup is probably atypical.
--Robb
dirkson writes:
Hi there!
If the version of a compilation tool changes between tup
compiles, the
output of a compilation step can change in a way that a tup user
might care
about, but that tup can't currently account for.
As an example, the commonmark-to-html tool I was using to
compile my
website recently changed its default behavior from "copy html in
commonmark
files" to "remove html in commonmark files". I ended up need to
emulate a
"Tup clean" by manually removing most of the generated files, to
force tup
to regenerate everything using the new method.
This could be solved by introducing 'tup clean', or by having
tup do some
sort of hash on the binaries and/or command lines used for
compilation. The
second sounds both messy and difficult, and it may result in
recompilation
when the user doesn't want it - Most GCC version bumps can be
safely
ignored, for example. This leaves 'tup clean' as the cleanest
obvious
solution to this particular problem.
Please feel free to correct me if I've said something dumb, or
if you can
think up a solution I missed.
Cheers,
-Dirk
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