Now that #1558 has been merged people can provide an environment in one of two ways;

1. Use the environment provided by conda using make env
2. Bring your own

For (1) the environment.yml file provided for use with conda and make env should provide a way to reliably reproduce an environment with a given version of tools.

For (2) the cmake environment should check that the versions of the tools you are bringing are correct. This should be like the normal version checking that cmake does as part of the normal cmake configure step (?).

The tools we are particularly sensitive to version numbers are locked to a specific revision in the environment.yml file. They are;

• symbiflow-yosys=0.8_3925_g6bccd35a=20200627_023447
• symbiflow-yosys-plugins=1.0.0.7_0041_g1c495fd=20200627_023447
• symbiflow-vtr=8.0.0.rc2_4003_g8980e4621=20200627_023447

This also opens up a future possibility where after upstream integration has been successful we can be less strict about checking the exact build version of certain tools.