Tips

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BUILD file errors

• All parent directories are required to have BUILD files in them (the "empty" build file is empty javascript array "[]").
• The json parsing library is very particular, make sure your json is valid.

Changing BUILD files

• When this happens, you need to-rerun repobuild.
• In some corner cases, you may need to run "make clean" and re-build your project. You can avoid a full clean by manually removing some of the '.gen-obj/...' files you need rebuilt.

Compile caching

• Setting up ccache can be very useful.
• If you are on ubuntu, this might help: http://pointclouds.org/documentation/advanced/c_cache.php

C++ Compiling

• repobuild --debug will disable most optimizations (-03, etc).
• Linking can be sped up by setting --noenable_flto_object_files.