Converting to use BLOCKs results in bazel looking for Liberty file in wrong location

[jeffng-or]

In #91, I've done the following:

• Updated orfs to v3.0-1160
• Updated BUILD.bazel to extract the RAM names and pass them to ORFS using the BLOCKS variable

It looks like the RAM names are passed correctly, since I see:

[INFO][FLOW] Invoked hierarchical flow.
Block ebtb_128x40 needs to be hardened.
Block array_256x128 needs to be hardened.
Block dataArrayB_256x64 needs to be hardened.
Block regfile_128x64 needs to be hardened.
Block regfile_128x65 needs to be hardened.
Block tag_array_64x184 needs to be hardened.
Block tag_array_64x168 needs to be hardened.
Block table_256x48 needs to be hardened.
Block table_128x52 needs to be hardened.
Block table_128x44 needs to be hardened.
Block btb_128x56 needs to be hardened.
Block meta_128x120 needs to be hardened.
Block lb_32x128 needs to be hardened.
Block sdq_17x64 needs to be hardened.
Block data_2048x8 needs to be hardened.
Block mem_256x4 needs to be hardened.
Block meta_40x240 needs to be hardened.

But, the bazel build BoomTile_floorplan fails with:

Error: read_liberty.tcl, 25 cannot read file ./results/asap7/BoomTile_ebtb_128x40/base/ebtb_128x40.lib.

The correct lib location is

bazel-bin/results/asap7/ebtb_128x40/base/ebtb_128x40.lib

I also see lots of warnings before we get to the failure point like:

external/bazel-orfs~~orfs_repositories~docker_orfs/OpenROAD-flow-scripts/flow/Makefile:379: target 'bazel-out/k8-fastbuild/bin//objects/asap7/BoomTile/base/lib/ebtb_128x40.lib' given more than once in the same rule

But, I'm not sure if that's getting in the way, so sharing this info in case @oharboe has an intuition on the issue.

@maliberty FYI.

[oharboe]

See update to PR, "BLOCKS" is a Makefile only construct in ORFS, bazel-orfs sets MACROS, so simply remove the code that sets "BLOCKS".

What motivated you to set "BLOCKS"?