Bazel tip - visualize dependencies

[oharboe]

Just making some generic Bazel tricks specifically useful for OpenROAD work available for crawlers rather than put it in OpenROAD docs.

To visualize dependencies and configurations:

bazelisk cquery -c opt --output=graph 'allpaths(//..., //:openroad)' | xdot /dev/stdin

To view configs:

$ bazel config
INFO: Invocation ID: 6cce44db-fcdc-4080-b800-3a532ee857cf
Available configurations:
0b24ccd92eac9aee30d9c3421cff5361ddbe5c98eb3ea136284156efe217cc05 k8-opt-exec-ST-d57f47055a04 (exec)
179bdd4dff24859741914c63e292d5d478f34934b4e420b74789777a63ddf529 k8-opt-exec-ST-d57f47055a04 (exec)
2646c780eef9dc8fac37e9c1b8ed1835783fe77977a89a4be239f50aeef4ce3b k8-opt
ab8cba103302292a2b1ba4f5816adc45d4e4bc4d1f3a0e0ddbfd94da0f3bd83b fastbuild-noconfig
d693ed2150dd70fc56dd72a6be9b5c12cb12ae44035794eefdf28449aa0ada55 k8-opt
Computing main repo mapping: 
$

(exec) above means that the configuration is for running on the host.

https://bazel.build/reference/be/general#cross-compilation-considerations

[oharboe]

@maliberty On 2d97822:

bazelisk cquery -c opt --output=graph 'allpaths(//..., //:openroad)' | xdot /dev/stdin

A single OpenROAD is built for bazel test ..., 790a1ad93f643dd7c565f0190faf3fdf44a4238273a7ac8740ce1a0fe09df461 k8-opt-exec-ST-d57f47055a04 (exec)

$ bazelisk config
INFO: Invocation ID: 3de94ec0-813a-4ef4-ba16-4425f8c14e10
Available configurations:
0f80209fc7e3c0c40539ecacd3b7790c7858f672569651d16f51ef22ebed6a87 k8-opt-exec-ST-6f5a6fb95be7 (exec)
3a4b806bae496300ade4ab3cbecfb7c2cd5b39c8280ce51450dcd25838ce05a3 k8-opt
790a1ad93f643dd7c565f0190faf3fdf44a4238273a7ac8740ce1a0fe09df461 k8-opt-exec-ST-d57f47055a04 (exec)
8472fe4754a50f76910e44f7d5bd0215dec569074d91f0edb82e2d45bcc77542 k8-opt
f37096aa0a6acd138beca4ff4d66b677012cd1d0d54befaa35983993505dad60 fastbuild-noconfig