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ARMmbed / yotta

DEPRECATED: yotta build; better software
Apache License 2.0
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`yotta build` rebuilds everything every time #786

Closed SimonSapin closed 7 years ago

SimonSapin commented 7 years ago

When I run yotta build for this module: https://github.com/lancaster-university/microbit-samples/ I get a bunch of output on the terminal that ends after a dozen seconds or so with:

[158/158] Linking CXX executable source/microbit-samples

This seems normal.

But when I run it again without touching any file it still takes a dozen seconds and produces all of the same output. I would expect the build system to reuse at least some of the generated files when the source files haven’t changed.

Am I doing something wrong?

autopulated commented 7 years ago

Definitely doesn't sound right – probably the most interesting thing to see what's causing the re-build is the first thing that gets re-built.

If you build with yotta build -- -v, and compare the start of the output between a clean build and a re-build, are there any differences?

SimonSapin commented 7 years ago

I… can’t seem to reproduce this now. After yotta clean, the second build finishes quickly with (some other output and) "ninja: no work to do."

So, uh, feel free to close.

autopulated commented 7 years ago

👍 It's possible it was caused by clock skew / files being created/copied from another machine with timestamps in the future.