diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index e5e6e6e5a4c49..84dd4c7ae3d8e 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -14,184 +14,7 @@ concurrency:
   cancel-in-progress: ${{ github.ref != 'refs/heads/master' }}
 
 jobs:
-  emscripten:
-    name: Emscripten
 
-    runs-on: ubuntu-20.04
-    container:
-      # If you change this version, change the number in the cache step too.
-      image: emscripten/emsdk:3.1.42
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Setup cache
-      uses: actions/cache@v3
-      with:
-        path: /emsdk/upstream/emscripten/cache
-        key: 3.1.42-${{ runner.os }}
-
-    - name: Patch Emscripten to support LZMA
-      run: |
-        cd /emsdk/upstream/emscripten
-        patch -p1 < ${GITHUB_WORKSPACE}/os/emscripten/emsdk-liblzma.patch
-
-    - name: Build (host tools)
-      run: |
-        mkdir build-host
-        cd build-host
-
-        echo "::group::CMake"
-        cmake .. -DOPTION_TOOLS_ONLY=ON
-        echo "::endgroup::"
-
-        echo "::group::Build"
-        echo "Running on $(nproc) cores"
-        cmake --build . -j $(nproc) --target tools
-        echo "::endgroup::"
-
-    - name: Install GCC problem matcher
-      uses: ammaraskar/gcc-problem-matcher@master
-
-    - name: Build
-      run: |
-        mkdir build
-        cd build
-
-        echo "::group::CMake"
-        emcmake cmake .. -DHOST_BINARY_DIR=../build-host
-        echo "::endgroup::"
-
-        echo "::group::Build"
-        echo "Running on $(nproc) cores"
-        cmake --build . -j $(nproc) --target openttd
-        echo "::endgroup::"
-
-  linux:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-        - name: Clang - Debug
-          compiler: clang
-          cxxcompiler: clang++
-          libraries: libsdl2-dev
-        - name: Clang - Release
-          compiler: clang
-          cxxcompiler: clang++
-          libraries: libsdl2-dev
-          extra-cmake-parameters: -DCMAKE_BUILD_TYPE=RelWithDebInfo -DOPTION_USE_ASSERTS=OFF
-        - name: GCC - SDL2
-          compiler: gcc
-          cxxcompiler: g++
-          libraries: libsdl2-dev
-        - name: GCC - SDL1.2
-          compiler: gcc
-          cxxcompiler: g++
-          libraries: libsdl1.2-dev
-        - name: GCC - Dedicated
-          compiler: gcc
-          cxxcompiler: g++
-          libraries: grfcodec
-          extra-cmake-parameters: -DOPTION_DEDICATED=ON -DCMAKE_CXX_FLAGS_INIT="-DRANDOM_DEBUG" -DCMAKE_DISABLE_PRECOMPILE_HEADERS=ON
-          # Compile without SDL / SDL2, as that should compile fine too.
-
-    name: Linux (${{ matrix.name }})
-
-    runs-on: ubuntu-latest
-    env:
-      CC: ${{ matrix.compiler }}
-      CXX: ${{ matrix.cxxcompiler }}
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Setup vcpkg caching
-      uses: actions/github-script@v6
-      with:
-        script: |
-          core.exportVariable('ACTIONS_CACHE_URL', process.env.ACTIONS_CACHE_URL || '');
-          core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env.ACTIONS_RUNTIME_TOKEN || '');
-          core.exportVariable('VCPKG_BINARY_SOURCES', 'clear;x-gha,readwrite')
-
-    - name: Install dependencies
-      run: |
-        echo "::group::Update apt"
-        sudo apt-get update
-        echo "::endgroup::"
-
-        echo "::group::Install dependencies"
-        sudo apt-get install -y --no-install-recommends \
-          liballegro4-dev \
-          libcurl4-openssl-dev \
-          libfontconfig-dev \
-          libharfbuzz-dev \
-          libicu-dev \
-          liblzma-dev \
-          liblzo2-dev \
-          ${{ matrix.libraries }} \
-          zlib1g-dev \
-          # EOF
-
-        echo "::group::Install vcpkg dependencies"
-
-        # Disable vcpkg integration, as we mostly use system libraries.
-        mv vcpkg.json vcpkg-disabled.json
-
-        # We only use breakpad from vcpkg, as its CMake files
-        # are a bit special. So the Ubuntu's variant doesn't work.
-        vcpkg install breakpad
-
-        echo "::endgroup::"
-      env:
-        DEBIAN_FRONTEND: noninteractive
-
-    - name: Get OpenGFX
-      run: |
-        mkdir -p ~/.local/share/openttd/baseset
-        cd ~/.local/share/openttd/baseset
-
-        echo "::group::Download OpenGFX"
-        curl -L https://cdn.openttd.org/opengfx-releases/0.6.0/opengfx-0.6.0-all.zip -o opengfx-all.zip
-        echo "::endgroup::"
-
-        echo "::group::Unpack OpenGFX"
-        unzip opengfx-all.zip
-        echo "::endgroup::"
-
-        rm -f opengfx-all.zip
-
-    - name: Install GCC problem matcher
-      uses: ammaraskar/gcc-problem-matcher@master
-
-    - name: Build
-      run: |
-        mkdir build
-        cd build
-
-        echo "::group::CMake"
-        cmake .. -DCMAKE_TOOLCHAIN_FILE=/usr/local/share/vcpkg/scripts/buildsystems/vcpkg.cmake ${{ matrix.extra-cmake-parameters }}
-        echo "::endgroup::"
-
-        echo "::group::Build"
-        echo "Running on $(nproc) cores"
-        cmake --build . -j $(nproc)
-        echo "::endgroup::"
-
-    - name: Test
-      run: |
-        (
-          cd build
-          ctest -j $(nproc) --timeout 120
-        )
-
-        # Re-enable vcpkg.
-        mv vcpkg-disabled.json vcpkg.json
-
-        # Check no tracked files have been modified.
-        git diff --exit-code
 
   macos:
     strategy:
@@ -247,6 +70,8 @@ jobs:
           -DCMAKE_OSX_ARCHITECTURES=${{ matrix.full_arch }} \
           -DVCPKG_TARGET_TRIPLET=${{ matrix.arch }}-osx \
           -DCMAKE_TOOLCHAIN_FILE=/usr/local/share/vcpkg/scripts/buildsystems/vcpkg.cmake \
+          -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+          -DCMAKE_DISABLE_PRECOMPILE_HEADERS=ON \
           # EOF
         echo "::endgroup::"
 
@@ -260,165 +85,13 @@ jobs:
         cd build
         ctest -j $(sysctl -n hw.logicalcpu) --timeout 120
 
-  windows:
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [windows-latest, windows-2019]
-        arch: [x86, x64]
-
-    name: Windows (${{ matrix.os }} / ${{ matrix.arch }})
-
-    runs-on: ${{ matrix.os }}
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Setup vcpkg caching
-      uses: actions/github-script@v6
-      with:
-        script: |
-          core.exportVariable('ACTIONS_CACHE_URL', process.env.ACTIONS_CACHE_URL || '');
-          core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env.ACTIONS_RUNTIME_TOKEN || '');
-          core.exportVariable('VCPKG_BINARY_SOURCES', 'clear;x-gha,readwrite')
-
-    - name: Install OpenGFX
-      shell: bash
-      run: |
-        mkdir -p "C:/Users/Public/Documents/OpenTTD/baseset"
-        cd "C:/Users/Public/Documents/OpenTTD/baseset"
 
-        echo "::group::Download OpenGFX"
-        curl -L https://cdn.openttd.org/opengfx-releases/0.6.0/opengfx-0.6.0-all.zip -o opengfx-all.zip
-        echo "::endgroup::"
-
-        echo "::group::Unpack OpenGFX"
-        unzip opengfx-all.zip
-        echo "::endgroup::"
-
-        rm -f opengfx-all.zip
-
-    - name: Install MSVC problem matcher
-      uses: ammaraskar/msvc-problem-matcher@master
-
-    - name: Configure developer command prompt for ${{ matrix.arch }}
-      uses: ilammy/msvc-dev-cmd@v1
-      with:
-        arch: ${{ matrix.arch }}
-
-    - name: Build
-      shell: bash
-      env:
-        NINJA_STATUS: "[%f/%t -- %e] " # [finished_edges/total_edges -- elapsed_time], default value is "[%f/%t] "
-      run: |
-        mkdir build
-        cd build
-
-        echo "::group::CMake"
-        cmake .. \
-          -GNinja \
-          -DVCPKG_TARGET_TRIPLET=${{ matrix.arch }}-windows-static \
-          -DCMAKE_TOOLCHAIN_FILE="c:\vcpkg\scripts\buildsystems\vcpkg.cmake" \
-          # EOF
-        echo "::endgroup::"
-
-        echo "::group::Build"
-        cmake --build .
-        echo "::endgroup::"
-
-    - name: Test
-      shell: bash
-      run: |
-        cd build
-        ctest --timeout 120
 
 
-  msys2:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - msystem: MINGW64
-            arch: x86_64
-          - msystem: MINGW32
-            arch: i686
-
-    name: MinGW (${{ matrix.arch }})
-
-    runs-on: windows-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-
-    - name: Setup MSYS2
-      uses: msys2/setup-msys2@v2
-      with:
-        msystem: ${{ matrix.msystem }}
-        release: false
-        install: >-
-          git
-          make
-          mingw-w64-${{ matrix.arch }}-cmake
-          mingw-w64-${{ matrix.arch }}-gcc
-          mingw-w64-${{ matrix.arch }}-lzo2
-          mingw-w64-${{ matrix.arch }}-libpng
-          mingw-w64-${{ matrix.arch }}-lld
-          mingw-w64-${{ matrix.arch }}-ninja
-
-    - name: Install OpenGFX
-      shell: bash
-      run: |
-        mkdir -p "C:/Users/Public/Documents/OpenTTD/baseset"
-        cd "C:/Users/Public/Documents/OpenTTD/baseset"
-
-        echo "::group::Download OpenGFX"
-        curl -L https://cdn.openttd.org/opengfx-releases/0.6.0/opengfx-0.6.0-all.zip -o opengfx-all.zip
-        echo "::endgroup::"
-
-        echo "::group::Unpack OpenGFX"
-        unzip opengfx-all.zip
-        echo "::endgroup::"
-
-        rm -f opengfx-all.zip
-
-    - name: Install GCC problem matcher
-      uses: ammaraskar/gcc-problem-matcher@master
-
-    - name: Build
-      shell: msys2 {0}
-      env:
-        NINJA_STATUS: "[%f/%t -- %e] " # [finished_edges/total_edges -- elapsed_time], default value is "[%f/%t] "
-      run: |
-        mkdir build
-        cd build
-
-        echo "::group::CMake"
-        cmake .. \
-          -GNinja \
-          -DCMAKE_CXX_FLAGS="-fuse-ld=lld" \
-          # EOF
-        echo "::endgroup::"
-
-        echo "::group::Build"
-        cmake --build .
-        echo "::endgroup::"
-
-    - name: Test
-      shell: msys2 {0}
-      run: |
-        cd build
-        ctest --timeout 120
-
   check_annotations:
     name: Check Annotations
     needs:
-    - emscripten
-    - linux
     - macos
-    - windows
-    - msys2
 
     if: always() && github.event_name == 'pull_request'
 
diff --git a/src/3rdparty/squirrel/squirrel/sqstate.cpp b/src/3rdparty/squirrel/squirrel/sqstate.cpp
index 3adb4d8f9813a..a7fa192d88da8 100644
--- a/src/3rdparty/squirrel/squirrel/sqstate.cpp
+++ b/src/3rdparty/squirrel/squirrel/sqstate.cpp
@@ -3,8 +3,10 @@
  */
 
 #include "../../../stdafx.h"
+#pragma message(XSTR(assert(true)))
 
 #include "sqpcheader.h"
+#pragma message(XSTR(assert(true)))
 #include "sqopcodes.h"
 #include "sqvm.h"
 #include "sqfuncproto.h"
diff --git a/src/blitter/32bpp_anim_sse4.cpp b/src/blitter/32bpp_anim_sse4.cpp
index b01420ef6dfac..5154a3f082a58 100644
--- a/src/blitter/32bpp_anim_sse4.cpp
+++ b/src/blitter/32bpp_anim_sse4.cpp
@@ -7,10 +7,10 @@
 
 /** @file 32bpp_anim_sse4.cpp Implementation of the SSE4 32 bpp blitter with animation support. */
 
-#include "palette_func.h"
 #ifdef WITH_SSE
 
 #include "../stdafx.h"
+#include "../palette_func.h"
 #include "../video/video_driver.hpp"
 #include "../table/sprites.h"
 #include "32bpp_anim_sse4.hpp"
diff --git a/src/network/core/os_abstraction.cpp b/src/network/core/os_abstraction.cpp
index 792ee8b2f48c6..62bec62852e27 100644
--- a/src/network/core/os_abstraction.cpp
+++ b/src/network/core/os_abstraction.cpp
@@ -19,6 +19,7 @@
 #include "stdafx.h"
 #include "os_abstraction.h"
 #include "../../string_func.h"
+#include "../../3rdparty/fmt/format.h"
 #include <mutex>
 
 #include "../../safeguards.h"
diff --git a/src/order_cmd.cpp b/src/order_cmd.cpp
index d6e1748f90d19..c6776b6a4e92b 100644
--- a/src/order_cmd.cpp
+++ b/src/order_cmd.cpp
@@ -8,7 +8,9 @@
 /** @file order_cmd.cpp Handling of orders. */
 
 #include "stdafx.h"
+#pragma message(XSTR(assert(true)))
 #include "debug.h"
+#pragma message(XSTR(assert(true)))
 #include "command_func.h"
 #include "company_func.h"
 #include "news_func.h"
diff --git a/src/os/windows/library_loader_win.cpp b/src/os/windows/library_loader_win.cpp
index a682f2e7f1fd0..0281b0ab230a3 100644
--- a/src/os/windows/library_loader_win.cpp
+++ b/src/os/windows/library_loader_win.cpp
@@ -12,6 +12,7 @@
 #include <windows.h>
 
 #include "../../library_loader.h"
+#include "../../3rdparty/fmt/format.h"
 
 #include "../../safeguards.h"
 
diff --git a/src/stdafx.h b/src/stdafx.h
index edfd4f02a95cb..7591107278052 100644
--- a/src/stdafx.h
+++ b/src/stdafx.h
@@ -393,6 +393,9 @@ void NORETURN AssertFailedError(int line, const char *file, const char *expressi
 #	define assert(expression) if (unlikely(!(expression))) AssertFailedError(__LINE__, __FILE__, #expression);
 #endif
 
+#define XSTR(x) STR(x)
+#define STR(x) #x
+
 /* Define JSON_ASSERT, which is used by nlohmann-json. Otherwise the header-file
  * will re-include assert.h, and reset the assert macro. */
 #define JSON_ASSERT(x) assert(x)
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index 8a40d3d4571ab..ae58641a5ce4e 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -8,7 +8,9 @@
 /** @file town_cmd.cpp Handling of town tiles. */
 
 #include "stdafx.h"
+#pragma message(XSTR(assert(true)))
 #include "road.h"
+#pragma message(XSTR(assert(true)))
 #include "road_internal.h" /* Cleaning up road bits */
 #include "road_cmd.h"
 #include "landscape.h"