From bc0288bb3a05bd246ef7986338ba027a13dfc5a7 Mon Sep 17 00:00:00 2001
From: Daniel Haag <121057143+denialhaag@users.noreply.github.com>
Date: Sat, 12 Sep 2026 03:20:22 +0200
Subject: [PATCH 1/3] Configure sccache for C++ coverage and linter builds

Assisted-by: GPT-6 Astra via Codex
---
 .github/workflows/reusable-cpp-coverage.yml | 9 ++++++++-
 .github/workflows/reusable-cpp-linter.yml   | 9 ++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/reusable-cpp-coverage.yml b/.github/workflows/reusable-cpp-coverage.yml
index e04a2ba..1a7456a 100644
--- a/.github/workflows/reusable-cpp-coverage.yml
+++ b/.github/workflows/reusable-cpp-coverage.yml
@@ -100,7 +100,14 @@ jobs:
           echo "LIT_BIN=$(which lit)" >> $GITHUB_ENV
 
       - name: Configure CMake
-        run: cmake --preset coverage
+        env:
+          USE_SCCACHE_GHA: ${{ inputs.use-sccache-gha }}
+        run: |
+          args=()
+          if [[ "$USE_SCCACHE_GHA" == "true" ]]; then
+            args+=(-DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache)
+          fi
+          cmake --preset coverage "${args[@]}"
 
       - name: Build
         run: cmake --build --preset coverage
diff --git a/.github/workflows/reusable-cpp-linter.yml b/.github/workflows/reusable-cpp-linter.yml
index 81886d5..cb78826 100644
--- a/.github/workflows/reusable-cpp-linter.yml
+++ b/.github/workflows/reusable-cpp-linter.yml
@@ -167,7 +167,14 @@ jobs:
           fi
 
       - name: Generate compilation database
-        run: cmake -B build --preset lint
+        env:
+          USE_SCCACHE_GHA: ${{ inputs.build-project && inputs.use-sccache-gha }}
+        run: |
+          args=()
+          if [[ "$USE_SCCACHE_GHA" == "true" ]]; then
+            args+=(-DCMAKE_C_COMPILER_LAUNCHER=sccache -DCMAKE_CXX_COMPILER_LAUNCHER=sccache)
+          fi
+          cmake -B build --preset lint "${args[@]}"
 
       - name: Build
         if: ${{ inputs.build-project }}

From f32d0b8b39b3362dc4eb34be616562f7f551ec5b Mon Sep 17 00:00:00 2001
From: Daniel Haag <121057143+denialhaag@users.noreply.github.com>
Date: Sat, 12 Sep 2026 03:32:17 +0200
Subject: [PATCH 2/3] Update changelog for compiler-cache setup fix

Assisted-by: GPT-6 Astra via Codex
---
 CHANGELOG.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74fb5e5..d014b8e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,11 @@ releases may include breaking changes.
 
 ## [Unreleased]
 
+### Fixed
+
+- 🐛 Configure `sccache` compiler launchers for C++ coverage and linter builds
+  ([#472]) ([**@denialhaag**])
+
 ## [2.4.1] - 2026-09-11
 
 ### Fixed
@@ -573,6 +578,7 @@ _📚 Refer to the [GitHub Release Notes] for previous changelogs._
 
 <!-- PR links -->
 
+[#472]: https://github.com/munich-quantum-toolkit/workflows/pull/472
 [#470]: https://github.com/munich-quantum-toolkit/workflows/pull/470
 [#463]: https://github.com/munich-quantum-toolkit/workflows/pull/463
 [#462]: https://github.com/munich-quantum-toolkit/workflows/pull/462

From 49821706a4c7889fbc27087e765898655bf97bb7 Mon Sep 17 00:00:00 2001
From: Daniel Haag <121057143+denialhaag@users.noreply.github.com>
Date: Sat, 12 Sep 2026 03:32:18 +0200
Subject: [PATCH 3/3] Prepare release of `v2.4.2`

Assisted-by: GPT-6 Astra via Codex
---
 CHANGELOG.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d014b8e..1620227 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ releases may include breaking changes.
 
 ## [Unreleased]
 
+## [2.4.2] - 2026-09-12
+
 ### Fixed
 
 - 🐛 Configure `sccache` compiler launchers for C++ coverage and linter builds
@@ -530,7 +532,8 @@ _📚 Refer to the [GitHub Release Notes] for previous changelogs._
 
 <!-- Version links -->
 
-[unreleased]: https://github.com/munich-quantum-toolkit/workflows/compare/v2.4.1...HEAD
+[unreleased]: https://github.com/munich-quantum-toolkit/workflows/compare/v2.4.2...HEAD
+[2.4.2]: https://github.com/munich-quantum-toolkit/workflows/releases/tag/v2.4.2
 [2.4.1]: https://github.com/munich-quantum-toolkit/workflows/releases/tag/v2.4.1
 [2.4.0]: https://github.com/munich-quantum-toolkit/workflows/releases/tag/v2.4.0
 [2.3.1]: https://github.com/munich-quantum-toolkit/workflows/releases/tag/v2.3.1