chore(release): v2.0.0

[plc-automated-release]

Release v2.0.0

Bumps all workspace packages from v1.1.0-dev → v2.0.0.

Review the updated CHANGELOG.md for a full list of changes.

---

Merge this PR to trigger tagging and GitHub release creation.

[github-actions]

Release Preview

This is the GitHub release that would be published if this PR were merged now.

• Title: RuSTy PLC Compiler 2.0.0
• Tag: v2.0.0
• Previous tag: v1.0.0

Rendered release

RuSTy PLC Compiler 2.0.0

This release publishes v2.0.0.

Below is the changelog since v1.0.0.

2.0.0 - 2026-09-17

Added

• cfc: Emit diagram locations in debug info (feat(cfc): emit diagram locations in debug info #1910)
• cfc: Report diagram locations in diagnostics (feat(cfc): report diagram locations in diagnostics #1909)
• parser: Accept CONSTANT on VAR_INPUT as a no-op (feat(parser): accept CONSTANT on VAR_INPUT as a no-op #1885)
• cfc: Storage mode (REF= assignment) (feat(cfc): storage mode (REF= assignment) #1891)
• cfc: Execution control (EN/ENO) (feat(cfc): execution control (EN/ENO) #1880)
• cfc: Storage mode (set/reset) (feat(cfc): storage mode (set/reset) #1851)
• cfc: Negations (feat(cfc): negations #1848)
• Reject undefined symbols when producing a shared object (feat: reject undefined symbols when producing a shared object #1823)
• Changed time to unsigned 32-bit preserving ltime as 64-bit ( feat!: changed time to unsigned 32-bit preserving ltime as 64-bit #1801)
• cfc: Jumps (feat(cfc): jumps #1814)
• cfc: Functions (feat(cfc): functions #1812)
• cfc: Stateful blocks (feat(cfc): stateful blocks #1811)
• cfc: Connectors and continuations (feat(cfc): connectors and continuations #1810)
• cfc: Returns (feat(cfc): returns #1809)
• cfc: Variable source/sinks (feat(cfc): variable source/sinks #1808)
• stdlib: Added LTIME to extra functions (feat(stdlib): Added LTIME to extra functions #1781)

Fixed

• Ensuring that TO_STRING conversion functions do not panic (fix: ensuring that TO_STRING conversion functions do not panic #1903)
• codegen: Store struct literal members with assignment semantics (fix(codegen): store struct literal members with assignment semantics #1912)
• codegen: Anchor debug locations to their own statement (fix(codegen): anchor debug locations to their own statement #1900)
• stdlib: Parse STRING_TO_* input with the compiler's literal grammar (fix(stdlib): parse STRING_TO_* input with the compiler's literal grammar #1907)
• codegen: Null-terminate untyped variadic argument lists (fix(codegen): null-terminate untyped variadic argument lists #1887)
• cfc: Adapt to new return pin format (fix(cfc): adapt to new return pin format #1906)
• validation: Remove VAR_INPUT {ref} warning (E042) (fix(validation): remove VAR_INPUT {ref} warning (E042) #1892)
• lowering: Resolve array ctor bounds through the index (fix(lowering): resolve array ctor bounds through the index #1897)
• Consolidated parsing logic for STRING_TO - DINT and LINT (fix: consolidated parsing logic for STRING_TO - DINT and LINT #1899)
• Added missing STRING_TO functions to the standard library (fix: added missing STRING_TO functions to the standard library #1884)
• stdlib: Stop strict UTF-8/UTF-16 decoding in string functions (fix(stdlib): stop strict UTF-8/UTF-16 decoding in string functions #1874)
• stdlib: Clamp out-of-range string function parameters (fix(stdlib): clamp out-of-range string function parameters #1873)
• stdlib: Saturate LDT date conversion, add defensive defaults (fix(stdlib): saturate LDT date conversion, add defensive defaults #1872)
• stdlib: Truncate oversized *_TO_STRING output (fix(stdlib): truncate oversized *_TO_STRING output #1871)
• stdlib: Default to epoch for invalid date constructor inputs (fix(stdlib): default to epoch for invalid date constructor inputs #1870)
• stdlib: Remove overflow panics from TIME mul/div (fix(stdlib): remove overflow panics from TIME mul/div #1867)
• stdlib: Use wrapping arithmetic in date/time functions (fix(stdlib): use wrapping arithmetic in date/time functions #1866)
• Keep struct-initializer parens when folding array elements (fix: keep struct-initializer parens when folding array elements #1878)
• Run the backend at -Oless for unoptimized builds (fix: run the backend at -Oless for unoptimized builds #1869)
• Counter will no longer count after removing LD or R (fix: counter will no longer count after removing LD or R #1877)
• Ensuring unary not validates that it requires a bit or integer (fix: ensuring unary not validates that it requires a bit or integer #1854)
• Program retain variables with inline type definitions (fix: program retain variables with inline type definitions #1863)
• Escape response-file backslashes for driver linkers (fix: escape response-file backslashes for driver linkers #1853)
• Pass plain variable arguments to REFERENCE TO inputs by address (fix: pass plain variable arguments to REFERENCE TO inputs by address #1846)
• Link the driver probe to a real path and plumb the sysroot onto the target (fix: link the driver probe to a real path and plumb the sysroot onto the target #1852)
• Implement ABS as a builtin (fix: implement ABS as a builtin #1849)
• cfc: Generic variable type resolution (fix(cfc): generic variable type resolution #1840)
• Move generics into a lowerer instead of resolver phase (fix: move generics into a lowerer instead of resolver phase #1820)
• Added warning for long time variant overflows (fix: added warning for long time variant overflows #1828)
• Removed round function (fix: removed round function #1841)
• stdlib: String writers terminate their own output (fix(stdlib): string writers terminate their own output #1817)
• Construct array elements in generated array type constructors (fix: construct array elements in generated array type constructors #1831)
• Emit lifetime markers for lowered call temporaries (fix: emit lifetime markers for lowered call temporaries #1803)
• Const-fold array initializers before lowering into constructors (fix: const-fold array initializers before lowering into constructors #1826)
• header-generator: Evaluate STRING/ARRAY sizes referencing constants (fix(header-generator): evaluate STRING/ARRAY sizes referencing constants #1815)
• Resolve generic TO_STRING/TO_WSTRING to the correct monomorphization (fix: resolve generic TO_STRING/TO_WSTRING to the correct monomorphization #1805)
• Ensuring no segfault when c library function returns oversized string (fix: ensuring no segfault when c library function returns oversized string #1794)
• Reject VAR_IN_OUT access from outside the declaring POU (fix: reject VAR_IN_OUT access from outside the declaring POU #1806)
• Validate the generic natures before lowering (fix: validate the generic natures before lowering #1793)
• stdlib: CONCAT/INSERT/REPLACE no longer overflow the result buffer (fix(stdlib): CONCAT/INSERT/REPLACE no longer overflow the result buffer #1791)
• Invalid numeric literal strings no longer crash the application … (fix: invalid numeric literal strings no longer crash the application … #1787)
• Annotate allocas inside actions correctly (fix: annotate allocas inside actions correctly #1784)
• Stdlib now accepts the correct data type for LDT_TO_** functions (fix: stdlib now accepts the correct data type for LDT_TO_** functions #1780)
• Resolve project paths containing glob metacharacters as literals (fix: resolve project paths containing glob metacharacters as literals #1777)
• Hwmap no longer infinitely recurses when an enum is in the project (fix: hwmap no longer infinitely recurses when an enum is in the project #1769) (fix: hwmap no longer infinitely recurses when an enum is in the project (#1769) #1776)

Refactored

• cfc: Simplify resolver and transpiler internals (refactor(cfc): simplify resolver and transpiler internals #1881)
• cfc: Adopt the bmx text declaration format (refactor(cfc): adopt the bmx text declaration format #1827)
• cfc: Rewrite the transpiler around a post-index stage (refactor(cfc): rewrite the transpiler around a post-index stage #1824)
• cfc: Delete plc_xml crate (refactor(cfc): delete plc_xml crate #1807)

Documentation

• Windows C++ Build Tools (docs: Windows C++ Build Tools #1792)

Expected release assets

Assets are uploaded asynchronously from the post-merge Build Linux and Build Windows runs on master.

• plc-linux-x86_64
• plc-linux-aarch64
• plc.exe
• plc-compiler_2.0.0-1_amd64.deb
• plc-compiler_2.0.0-1_arm64.deb
• plc-stdlib_2.0.0-1_amd64.deb
• plc-stdlib_2.0.0-1_arm64.deb
• stdlib-2.0.0.tar.gz
• iec61131std.dll
• iec61131std.lib

Linux packages prefer the native build for each target architecture.

[github-actions]

Build Artifacts

🐧 Linux

Artifact	Link	Size
plc-x86_64	Download	43.6 MB
stdlib	Download	32.6 MB
deb-x86_64	Download	38.5 MB
schema	Download	0.0 MB
plc-aarch64	Download	43.4 MB
deb-aarch64	Download	30.9 MB

From workflow run

🪟 Windows

Artifact	Link	Size
plc.exe	Download	38.4 MB
stdlib.lib	Download	4.0 MB
stdlib.dll	Download	0.1 MB

From workflow run

[github-actions]

1 finding in 5m 8s for $0.14 between 43b9e67 (master) and 5f1999a (release/next):

• P3 CHANGELOG.md:78: The generated changelog now jumps from 2.0.0 directly to 1.0.0, deleting the existing 1.0.1 release entry even though tag v1.0.1 is present in the repository. This loses the release-specific history for users looking up that published version; retain the 1.0.1 section instead of folding its fix into 2.0.0.

[github-actions]

1 finding in 3m 29s for $0.10 between f216425 (master) and 33855ca (release/next):

• P2 CHANGELOG.md:79: The release changelog drops the existing v1.0.1 section entirely, jumping from the new v2.0.0 section straight to v1.0.0. Since v1.0.1 is an already released tag, this removes its release-specific history from the canonical changelog; retain that section below v2.0.0.

[github-actions]

1 finding in 3m 9s for $0.10 between 1cdbb74 (master) and 04a30e8 (release/next):

• P2 CHANGELOG.md:5: The release update replaces the existing v1.0.1 section instead of retaining it. Since v1.0.1 is an existing tagged release, its changelog entry is now lost and the fix: hwmap no longer infinitely recurses when an enum is in the project #1769 fix is incorrectly folded into the v2.0.0 section.

[github-actions]

1 finding in 3m 0s for $0.09 between c4a01d3 (master) and a1498aa (release/next):

• P2 CHANGELOG.md:5: The new 2.0.0 section replaces the existing 1.0.1 section instead of being added before it, so the changelog no longer documents the released v1.0.1 (including its release date and notes). Preserve the 1.0.1 section below the 2.0.0 notes.

[github-actions]

1 finding in 3m 46s for $0.12 between 44b84d6 (master) and b2e0e9b (release/next):

• P2 CHANGELOG.md:79: The release update removes the existing v1.0.1 section instead of retaining it, and moves its sole fix (fix: hwmap no longer infinitely recurses when an enum is in the project #1769) into the v2.0.0 notes. This makes the published changelog omit a released version and falsely attributes that fix to v2.0.0.

[github-actions]

1 finding in 3m 22s for $0.08 between 12d5d3a (master) and f28ce55 (release/next):

• P2 CHANGELOG.md:83: The generated changelog drops the existing v1.0.1 release: after v2.0.0 it jumps directly to v1.0.0, even though v1.0.1 is a released tag and was documented before this change. Its fix is also repeated in the v2.0.0 list at line 71, so users get both an incorrect release attribution and no v1.0.1 history; preserve the prior section when adding the new release.

[github-actions]

1 finding in 2m 51s for $0.10 between e147785 (master) and f4d4d46 (release/next):

• P3 CHANGELOG.md:84: The release update removes the existing v1.0.1 section and jumps from v2.0.0 to v1.0.0. Although the fix text is repeated under v2.0.0, the published v1.0.1 release and its date are no longer represented, so the changelog loses an entry from the release history; retain the v1.0.1 section below the new release.

[github-actions]

1 finding in 4m 36s for $0.14 between 931f4ef (master) and 404806d (release/next):

• P3 CHANGELOG.md:5: This replaces the existing v1.0.1 section instead of adding v2.0.0 above it, so the released v1.0.1 notes and link disappear even though that tag remains available. Retain the prior release section below the new entry.

[github-actions]

1 finding in 3m 53s for $0.10 between e72bfbe (master) and dea3ac8 (release/next):

• P2 CHANGELOG.md:5: The new 2.0.0 section replaces the existing v1.0.1 section instead of preserving it. The resulting changelog has no 1.0.1 entry and moves its previously documented fix (fix: hwmap no longer infinitely recurses when an enum is in the project #1769) into 2.0.0, so the already-published release history is lost and misattributed.

[github-actions]

2 findings in 5m 30s for $0.13 between bf5e6a1 (master) and f234de9 (release/next):

• P2 book/user/building/compiling.md:102: The release bumps the compiler to 2.0.0, but the documented .comment sample still identifies plc version 1.1.0-dev; output from this branch no longer agrees with the example. Update the sample (including its date/hash) or label it explicitly as output from an older compiler.
• P2 CHANGELOG.md:4:1: The new top section replaces the existing v1.0.1 release entry, so the published v1.0.1 link and its release notes disappear from the changelog; the hwmap fix is now attributed to v2.0.0 instead. Preserve the v1.0.1 section below v2.0.0 so the release history remains accurate.