On Wed, Sep 5, 2018 at 9:56 PM, Antoine Pitrou <anto...@python.org> wrote:
> > Hello, > > On our project (Apache Arrow - https://arrow.apache.org/) we're using > CMake for the C++ source tree and have many external dependencies > fetched using ExternalProject. In turn building those dependencies can > make up a significant portion of build times on CI services, especially > AppVeyor. So I've been looking for a solution to cache those > third-party builds from one CI run to the other. > > Right now, what I'm trying to do is to set EP_BASE to a well-known base > directory and ask AppVeyor to cache and restore that directory in each > new build. The AppVeyor caching seems to work fine (the EP_BASE > directory is saved and restored). However, it seems that nevertheless > CMake will rebuild all those projects again, despite the cached build > results. > When AppVeyor restores the cached directories and files, does it also preserve their timestamps? If not, that might explain why it always rebuilds. > > This is with CMake 3.12.1 on Windows. > > Here is the log for an example build step, here the zstd library: > https://ci.appveyor.com/project/pitrou/arrow/build/1. > 0.700/job/i4tj6tifp4xq1mjn?fullLog=true#L803 > > As you can see, CMake notices the downloaded tarball is up-to-date and > doesn't download it again, but it still extracts it again (why?) and > builds the source code anew. Yet the entire EP_BASE directory (here > "C:/Users/appveyor/arrow-externals") is cached and restored by AppVeyor. > > Did someone manage to make this work, and/or is there another solution? > > -- Craig Scott Melbourne, Australia https://crascit.com New book released: Professional CMake: A Practical Guide <https://crascit.com/professional-cmake/>
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