diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index df771b6012cd9..1f9a72c9b76ff 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -172,7 +172,7 @@ jobs:
         cd build
 
         echo "::group::CMake"
-        cmake .. -DCMAKE_TOOLCHAIN_FILE=/usr/local/share/vcpkg/scripts/buildsystems/vcpkg.cmake ${{ matrix.extra-cmake-parameters }}
+        cmake .. -DCMAKE_TOOLCHAIN_FILE=/usr/local/share/vcpkg/scripts/buildsystems/vcpkg.cmake ${{ matrix.extra-cmake-parameters }} -DCMAKE_BUILD_TYPE=RelWithDebInfo
         echo "::endgroup::"
 
         echo "::group::Build"
@@ -247,6 +247,8 @@ 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::"
 
@@ -320,6 +322,7 @@ jobs:
           -GNinja \
           -DVCPKG_TARGET_TRIPLET=${{ matrix.arch }}-windows-static \
           -DCMAKE_TOOLCHAIN_FILE="c:\vcpkg\scripts\buildsystems\vcpkg.cmake" \
+          -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           # EOF
         echo "::endgroup::"
 
@@ -398,6 +401,7 @@ jobs:
         cmake .. \
           -GNinja \
           -DCMAKE_CXX_FLAGS="-fuse-ld=lld" \
+          -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           # EOF
         echo "::endgroup::"
 
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/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/road.h b/src/road.h
index c6a88e85524e3..b28076524eedf 100644
--- a/src/road.h
+++ b/src/road.h
@@ -10,14 +10,23 @@
 #ifndef ROAD_H
 #define ROAD_H
 
+#pragma message(XSTR(assert(true)))
 #include "road_type.h"
+#pragma message(XSTR(assert(true)))
 #include "gfx_type.h"
+#pragma message(XSTR(assert(true)))
 #include "core/bitmath_func.hpp"
+#pragma message(XSTR(assert(true)))
 #include "strings_type.h"
+#pragma message(XSTR(assert(true)))
 #include "timer/timer_game_calendar.h"
+#pragma message(XSTR(assert(true)))
 #include "core/enum_type.hpp"
+#pragma message(XSTR(assert(true)))
 #include "newgrf.h"
+#pragma message(XSTR(assert(true)))
 #include "economy_func.h"
+#pragma message(XSTR(assert(true)))
 
 
 enum RoadTramType : bool {
diff --git a/src/stdafx.h b/src/stdafx.h
index ab96be4e5ae00..93d9564a68022 100644
--- a/src/stdafx.h
+++ b/src/stdafx.h
@@ -394,6 +394,9 @@ 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"