* Kokoro CI bots use git-sync-deps to get sources
Update git-sync-deps to reduce the amount of data downloaded on a first
checkout, while being able to checkout the specific commit specified in
the DEPS file.
Previously the CI bots would only clone --depth=1. But that's not
enough to check out a specific commit. So clone either blobless
or treeless. For a CI bot, treeless is preferable, because it
downloads the least data. For interactive use, blobless is better
because it prevents redundant downloads of tree data.
See
https://github.blog/2020-12-21-get-up-to-speed-with-partial-clone-and-shallow-clone/Fixes: #5028
* --treeless decays to blob:none when git is too old
* Pin googletest to an older version, to make bazel build work
This change improves spirv-fuzz CMake code to be more compatible with other projects that might want to include spirv-fuzz as a sub-project.
* Add a CMake option for building spirv-fuzz.
* We now check if protobuf targets are already available.
* We no longer specify `-DGOOGLE_PROTOBUF_NO_RTTI -DGOOGLE_PROTOBUF_USE_UNALIGNED=0`; a newer version of protobuf does not require this. Note that we probably should have specified this for protobuf targets as well, but this is no longer needed.
* Updated protobuf version in Kokoro scripts and README.md.
Updated script to work with python3 and python2.
Added required tools.
We added a section to the readme to mention the tools that are needed to
build and test spirv-tools. For the compiler, the compilers used by the
bots are mentioned.
The bots have been changed. The windows bots will not use python 3.6 for testing. The other bots will still use python 2.7. Both Python2 and Python3 will be tested.
Fixes#2407.
Fixes#1856.
