hf-nec2c is an independent preservation and maintained-derivative repository. It is not the
official NEC2C project, does not claim succession to that project, and does not claim endorsement
by Neoklis Kyriazis.
The repository preserves the original-author NEC2C 1.3.1 distribution, records the untouched-source
Windows compiler baselines, and carries the independently authored
HF_NEC2C_MAINTAINED_SOURCE_V2 candidate under src/nec2c/. Maintained-source v1 remains
preserved and tagged. The immutable archive and upstream extraction remain byte-preserved;
maintained changes are isolated and reconstructible from deterministic combined patches.
- Original author: Neoklis Kyriazis
- Selected release: NEC2C 1.3.1
- Original archive:
nec2c-1.3.1.tar.bz2 - Archive size: 186,124 bytes
- SHA-256:
8c706008bcb11c34bf33a3f8f78711c79f7bb49de8a22d74df6b10e1203c013e - Archive tag:
archive/nec2c-1.3.1-original - Intake tag:
preservation/nec2c-1.3.1-intake-v1
The original archive is preserved byte-for-byte in archive/. Its exact extracted source tree
is in upstream/nec2c-1.3.1/. Deterministic hashes, archive metadata, and retrieval evidence are
in manifests/.
The maintained NEC2C v1.3.3 tree is not the source base. No later-contributor source has been silently imported.
Repository policy handles the original NEC2C 1.3.1 source under the preserved original-author
public-domain statement in README section 7. The complete original README, its author/date
footer, original notices and disclaimers, and the bundled GPLv3 COPYING remain preserved as
historical source evidence.
BSD-2-Clause applies only to copyrightable project-authored additions and modifications. It does
not relabel the original archive, the extracted upstream source, or later third-party work as
project-owned BSD code. This mixed-provenance repository intentionally has no plain root
LICENSE; see THIRD_PARTY_NOTICES.md and
LICENSES/README.md.
From Windows PowerShell:
.\verify-preservation.ps1Or invoke the standard-library Python verifier directly:
py -3 -I .\tools\verify_preservation.py --repository-root .The verifier performs no network access and writes no files. It recomputes the fixed archive SHA-256, checks the archive byte count, verifies every extracted file from raw bytes, and detects missing, extra, linked, reparse-point, or other unsupported objects in the preserved tree.
The A2 build entry point is:
powershell.exe -NoLogo -NoProfile -ExecutionPolicy Bypass `
-File .\build-support\windows-x64\build.ps1 -BuildId <fresh-id>It authenticates and freshly extracts the archive before compiling, keeps all generated
material ignored, and reverifies source and preservation state afterward. The installed
environment had no GCC/MinGW-w64 or Clang route. The only native AMD64 candidate, MSVC 19.29,
failed consistently because the untouched source requires unistd.h. See
docs/WINDOWS_X64_UNMODIFIED_BUILD.md and
manifests/windows-x64-unmodified-build-v1.json.
The canonical disposition is: UNMODIFIED MSVC WINDOWS X64 BUILD ATTEMPT REPRODUCIBLY BLOCKED
BY POSIX HEADER DEPENDENCY.
The A2b build entry point is:
powershell.exe -NoLogo -NoProfile -ExecutionPolicy Bypass `
-File .\build-support\windows-x64-mingw-ucrt64\build.ps1 `
-BuildId <fresh-id>The authenticated, fully updated MSYS2 environment at C:\msys64 used UCRT64 GCC 16.1.0-5
targeting x86_64-w64-mingw32. The shipped configure completed out of tree, then GNU make
failed while compiling the first translation unit because original nec2c.h line 15 requires
sys/times.h, which the installed MinGW-w64 UCRT64 headers do not provide. Source authentication
and preservation checks passed before and after the attempt. No source byte was changed, no
compatibility code was added, no executable was produced, and numerical behavior remains
unqualified.
See docs/WINDOWS_X64_MINGW_UCRT64_UNMODIFIED_BUILD.md and manifests/windows-x64-mingw-ucrt64-unmodified-build-v1.json. The canonical disposition is: UNMODIFIED MSYS2 UCRT64 WINDOWS X64 BUILD ATTEMPT BLOCKED BY SYS/TIMES.H DEPENDENCY.
A project-authored BSD-2-Clause reconnaissance candidate now records the smallest tested
process-CPU-time boundary for the original NEC2C 1.3.1 source. The candidate remains a patch
artifact under probes/; it is not a maintained source
tree, qualified solver, or distribution approval.
The corrected patch preserved the existing source-file EOF bytes and every non-timing line in the
MSYS minimal-dipole report. Under native UCRT64, it advanced compilation beyond sys/times.h to
the first new proven blocker: the unavailable struct sigaction interface at original main.c
line 84. Linking was not reached and no native executable was produced. See the
native UCRT64 timing probe for the bounded evidence and
non-qualification limits.
A second project-authored BSD-2-Clause reconnaissance patch records the smallest tested
signal-registration platform boundary. It remains a patch artifact under
probes/, not a maintained source tree,
qualified solver, or distribution approval.
The patch preserved the complete 6,825-byte MSYS minimal-dipole report and advanced native
UCRT64 compilation beyond struct sigaction, producing main.o. The next proven blocker is
the original CR macro at nec2c.h:76 colliding with the native winnt.h CR bit-field
while compiling misc.c. Linking was not reached and no native executable was produced. See
the native UCRT64 signal probe for the bounded evidence and
non-qualification limits.
A third project-authored BSD-2-Clause reconnaissance patch localizes NEC2C's generic CR and
LF parser constants. It remains a patch artifact under
probes/, not a maintained source tree,
qualified solver, release artifact, or integration approval.
After the validated timing and signal patches, this patch preserved the complete accepted
6,825-byte MSYS report. Native UCRT64 then compiled all 12 translation units, linked a PE32+
AMD64 executable with no msys-2.0.dll import, and passed -v, -h, and one
minimal-dipole run. Normalizing only native CRLF to LF made the complete native report
byte-identical to the MSYS report. See the
native UCRT64 parser-control-character probe for the
bounded evidence and non-qualification limits.
The validated portability sequence remains preserved as
HF_NEC2C_MAINTAINED_SOURCE_V1. Its immutable tag
maintained/nec2c-1.3.1-hf-portability-v1 still targets
05f9a4f7ad9a089e45459db9099e47e0bf4533c2; its manifest, combined patch, and documentation are
unchanged.
The current src/nec2c/ tree is HF_NEC2C_MAINTAINED_SOURCE_V2. It adds exactly one
authenticated four-line source-fidelity correction in calculations.c: the cc5 exponent, the
distinct cn constant, and the small- and medium-regime returns. The complete tree contains 36
files and 788,941 bytes. A fresh authenticated extraction was reconstructed byte-for-byte by
applying only the 7,624-byte combined
nec2c-1.3.1-hf-portability-zint-v2.patch,
whose SHA-256 is
9b165d93e4e3335f4c2762c70950a7086d1f6c7ee0559a1f3f3f5c08f6219e52.
Direct tests of the actual compiled zint() passed all 12 frozen regime and boundary inputs under
MSYS GCC 15.3.0 and native UCRT64 GCC 16.1.0. Fresh maintained builds and the complete frozen
corpus also remained aligned across both primary runtimes. These results validate the source fix
but do not numerically qualify or release the solver.
See the v2 maintained-source record and manifest for construction, provenance, hashes, direct-test evidence, build identities, and current limitations. The preserved v1 record remains the historical v1 identity.
The complete eight-case v0.0.5f-C rerun has disposition B. V2 SOURCE FIX VALIDATED; QUALIFICATION REMAINS BLOCKED BY THE FROZEN REFERENCE MISMATCH. All 24 reports passed integrity; all cross-platform and invariant checks passed; all seven unaffected cases were exactly unchanged as complete parsed v1/v2 reports for both primary builds; and Example 2 snapshots 0 through 2 were unchanged. Only the corrected loaded snapshot changed.
The rerun reduced the frozen authoritative failures from eight to one without altering an
expected value or tolerance. The sole blocker remains the official Example 2 feed-current
imaginary literal -3.86680E-03 A, versus approximately -3.8666E-03 A from both v2 primary
builds and internal NEC2DX. Its cause remains unresolved; the repository does not declare it a
publication error.
See the v0.0.5f-C qualification record, frozen suite manifest, and v2 normalized result summary. The preserved v0.0.5f-B record remains the frozen v1 baseline. No result authorizes a binary release, distribution, a v2 tag before merge, or HF Propagation Control integration.
HF Propagation Control remains a separate application. Its planned integration uses a documented process/file boundary:
HF Propagation Control
-> generated NEC input deck
-> separate hf-nec2c executable
-> structured solver result
-> solver-neutral pattern data
No NEC2C source is copied into HF Propagation Control. This process boundary supports independent provenance and release management; it is not claimed to be a complete operating-system sandbox.
This repository contains maintained source but no tracked solver executable, release, Git LFS
object, GitHub Actions workflow, submodule, package dependency, or Software Heritage submission.
The maintained candidate is independent, numerically unqualified, unreleased, and unapplied. It
is not approved for distribution or HF Propagation Control integration. The
NEC2DX oracle decision limits the historical Fortran source to
an internal secondary cross-check. The
internal native build probe records that untouched NEC2DX
is blocked at its legacy SECOND timing interface under UCRT64 GNU Fortran 16.1.0; no executable,
smoke run, or numerical comparison resulted, and public intake remains blocked.
The internal SECOND compatibility probe records that
two ignored declaration-only edits enabled a native build and bounded smoke; NEC2DX remains an
unqualified, non-redistributable secondary cross-check.
The NEC2DX reproducibility probe records repeatable edited
source, compilation, executable structure, raw report bytes, and parsed physical output; the two
executables differed only in identified PE timestamp and checksum metadata.
See PROVENANCE.md, CONTRIBUTING.md, and MAINTENANCE.md for the evidence and controls.
- Engineering execution policy
- NEC2C 1.3.1 portability map
- MSYS POSIX unmodified build probe records that untouched NEC2C 1.3.1 builds and runs as an unqualified, MSYS-runtime regression-baseline candidate.