librelane: init at 3.0.0.dev47-unstable-2026-01-16

[gonsolo]

ASIC implementation flow infrastructure, successor to OpenLane
https://github.com/librelane/librelane

• Built on platform:
  • x86_64-linux
• Tested basic functionality of all binary files, usually in ./result/bin/.

[Dvd-Znf]

i think you accidentally included commits other than librelane: init at 3.0.0.dev45 by maybe branching from anothers PR branch instead of clean master

you can try using git rebase -i to remove the other commits

[gonsolo]

i think you accidentally included commits other than librelane: init at 3.0.0.dev45 by maybe branching from anothers PR branch instead of clean master

All the commits are dependencies of librelane. I rebased onto them to be able to nix build librelane before all of them are upstream.

I converted this PR to a draft for now.

[donn]

Just a note: OpenROAD must be built with Python packages and the ability to load libraries and be available to LibreLane for LibreLane to actually fully work in Nix (librelane --smoke-test must pass.) The Python package standalone isn't useful for much unless you have Docker installed or you have all of the requisite utilities in the Nix environment.

The overlays we use to get LibreLane working entirely in Nix are not up to nixpkgs standards and they would take a monumental effort to get them there. That's why I haven't bothered myself. https://github.com/librelane/librelane/blob/c68e32b888bb5f42fec75fa0d8bcc7fb8c994ab6/default.nix

[gonsolo]

librelane --smoke-test must pass.

That's very good to know!

The Python package standalone isn't useful for much unless you have Docker installed or you have all of the requisite utilities in the Nix environment.

Ok.

The overlays we use to get LibreLane working entirely in Nix are not up to nixpkgs standards and they would take a monumental effort to get them there. That's why I haven't bothered myself. https://github.com/librelane/librelane/blob/c68e32b888bb5f42fec75fa0d8bcc7fb8c994ab6/default.nix

Ok, I'll have a look.

[gonsolo]

(librelane --smoke-test must pass.)

It does now.

The overlays we use to get LibreLane working entirely in Nix are not up to nixpkgs standards and they would take a monumental effort to get them there. That's why I haven't bothered myself. https://github.com/librelane/librelane/blob/c68e32b888bb5f42fec75fa0d8bcc7fb8c994ab6/default.nix

I didn't look very close at those.

@donn Can you take a look whether I forgot something? As mentioned above, the smoke test works for me now.

[donn]

If --smoke-test passes I have no objections. Though I do wonder how it passes considering the OpenROAD and Yosys Python interpreters shouldn't have access to the click library according to what I'm seeing here…? Attempting to import either library typically causes an immediate crash with this setup.

[gonsolo]

If --smoke-test passes I have no objections.

Cool, thanks.

Though I do wonder how it passes considering the OpenROAD and Yosys Python interpreters shouldn't have access to the click library according to what I'm seeing here…? Attempting to import either library typically causes an immediate crash with this setup.

I see click in Yosys's package.nix, and grepping through OpenROAD seems to wanting to install it, but I can find no use.

[donn]

Mostly LGTM, need to sit down and test it now. Really busy so might take a while.

[gonsolo]

1. librelane: All dependencies merged!

Merged:

1. openroad
2. yosys
3. lemon-graph
4. magic
5. netgen-vlsi

FYI @donn, @mole99, @eljamm @imincik @GaetanLepage.

[gonsolo]

* Antenna
Passed ✅

* LVS
Passed ✅

* DRC
Passed ✅

...

[11:07:11] INFO     Smoke test passed.          

FYI @SuperSandro2000 @eljamm @donn @mole99 @GaetanLepage

[gonsolo]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 471712
Commit: 2c326cb69a706e97de0c9954bf1e2a1199fa5475

---

x86_64-linux

✅ 2 packages built:

• librelane
• librelane.dist

[gonsolo]

I applied your suggestions, @GaetanLepage, thanks for reviewing!
Is there anything left before being ready to merge?
(Smoke test still passes.)

[GaetanLepage]

Maybe you already answered this, but wouldn't it work to fetch the 3.0.0.dev47 tag instead of this commit?

[gonsolo]

Maybe you already answered this, but wouldn't it work to fetch the 3.0.0.dev47 tag instead of this commit?

I would have to apply a second PR since that release:
librelane/librelane#843
Whatever you prefer.

I expect the newer PR 844 to be merged before a dev48, after which I would immediately update librelane in Nix, dropping the patch(es).

It can be done before or after merging, I'm just committed to get it merged. :)

[gonsolo]

Maybe you already answered this, but wouldn't it work to fetch the 3.0.0.dev47 tag instead of this commit?

I would have to apply a second PR since that release: librelane/librelane#843 Whatever you prefer.

I expect the newer PR 844 to be merged before a dev48, after which I would immediately update librelane in Nix, dropping the patch(es).

It can be done before or after merging, I'm just committed to get it merged. :)

@GaetanLepage: The patch was added to the dev branch of librelane. I updated the revision and dropped the patch.
As I promised earlier: As soon as dev48 is out I will use the tag.

[gonsolo]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 471712
Commit: 45702f3a4e702913e6091d90b7f5eeecff1a3aa7

---

x86_64-linux

✅ 2 packages built:

• librelane
• librelane.dist

[gonsolo]

* Antenna
Passed ✅

* LVS
Passed ✅

* DRC
Passed ✅

[17:11:02] INFO     Saving views to '/tmp/tmpk7s_rdcilibrelane/smoke_test_design/runs/RUN_2026-01-16_17-09-39/final'…         state.py:209
[17:11:03] INFO     Flow complete.                                                                                       sequential.py:411
Classic - Stage 79 - Report Manufacturability ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 79/79 0:01:23
[17:11:03] WARNING  The following warnings were generated by the flow:                                                         flow.py:696
[17:11:03] WARNING  [Odb.CustomIOPlacement] Overriding minimum distance 0.1 with 0.42 for pins on side N to avoid overlap.     flow.py:698
[17:11:03] WARNING  [OpenROAD.RepairDesignPostGPL] [STA-1140]                                                                  flow.py:698
                    /home/gonsolo/.ciel/ciel/sky130/versions/8afc8346a57fe1ab7934ba5a6056ea8b43078e71/sky130A/libs.ref/sky130_            
                    fd_sc_hd/lib/sky130_fd_sc_hd__tt_025C_1v80.lib line 1, library sky130_fd_sc_hd__tt_025C_1v80 already                  
                    exists. (and 17 similar warnings)                                                                                     
[17:11:03] WARNING  [OpenROAD.DetailedRouting] [DRT-0349] LEF58_ENCLOSURE with no CUTCLASS is not supported. Skipping for      flow.py:698
                    layer mcon (and 9 similar warnings)                                                                                   
[17:11:03] WARNING  [Checker.WireLength] Threshold for Threshold-surpassing long wires is not set. The checker will be         flow.py:698
                    skipped.                                                                                                              
[17:11:03] WARNING  [OpenROAD.IRDropReport] 'VSRC_LOC_FILES' was not given a value, which may make the results of IR drop      flow.py:698
                    analysis inaccurate. If you are not integrating a top-level chip for manufacture, you may ignore this                 
                    warning, otherwise, see the documentation for 'VSRC_LOC_FILES'.                                                       
[17:11:03] INFO     Smoke test passed.                                                                                     __main__.py:292
gonsolo nixpkgs:g show HEAD
commit 45702f3a4e702913e6091d90b7f5eeecff1a3aa7 (HEAD -> librelane, origin/librelane)

[GaetanLepage]

The commit message and PR name should match the version:
librelane: init at 3.0.0.dev47-unstable-2026-01-12

[gonsolo]

The commit message and PR name should match the version: librelane: init at 3.0.0.dev47-unstable-2026-01-12

Done.

[gonsolo]

The commit message and PR name should match the version: librelane: init at 3.0.0.dev47-unstable-2026-01-12

Done.

I changed to librelane: init at 3.0.0.dev47-unstable-2026-01-16, since the patch from today was added.

[GaetanLepage]

LGTM