From 8788164dd7647d5f4413aa795078dbdcb57d6543 Mon Sep 17 00:00:00 2001
From: Gabor Gyimesi <gamezbird@gmail.com>
Date: Tue, 17 Mar 2026 17:34:27 +0100
Subject: [PATCH] MINIFICPP-2750 Fix Windows build with CMake 4

CMake 4 is not compatible with CMake features in versions older than
CMake 3.5. We need to specify at least version 3.5 for minimum
requirements to make configuration succeed. Fortunately winflexbison
does not use any older CMake features so changing the required version
solves the issue.
---
 cmake/ExpressionLanguage.cmake                | 14 +++++++
 .../winflexbison/minimum_cmake_version.patch  | 40 +++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 thirdparty/winflexbison/minimum_cmake_version.patch

diff --git a/cmake/ExpressionLanguage.cmake b/cmake/ExpressionLanguage.cmake
index 0626637095..3a06ce3999 100644
--- a/cmake/ExpressionLanguage.cmake
+++ b/cmake/ExpressionLanguage.cmake
@@ -20,10 +20,16 @@ if(WIN32)
 
     set(BASE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
 
+    set(PATCH_FILE "${CMAKE_SOURCE_DIR}/thirdparty/winflexbison/minimum_cmake_version.patch")
+
+    set(PC ${Bash_EXECUTABLE}  -c "set -x &&\
+            (\\\"${Patch_EXECUTABLE}\\\" -p1 -R -s -f --dry-run -i \\\"${PATCH_FILE}\\\" || \\\"${Patch_EXECUTABLE}\\\" -p1 -N -i \\\"${PATCH_FILE}\\\")")
+
     FetchContent_Declare(
         winflexbison
         URL "https://github.com/lexxmark/winflexbison/archive/refs/tags/v2.5.25.tar.gz"
         URL_HASH "SHA256=8e1b71e037b524ba3f576babb0cf59182061df1f19cd86112f085a882560f60b"
+        PATCH_COMMAND "${PC}"
         SYSTEM
     )
     FetchContent_GetProperties("winflexbison")
@@ -38,6 +44,10 @@ if(WIN32)
         ERROR_VARIABLE bisonbuildE
         )
 
+        if(NOT result EQUAL 0)
+            message(FATAL_ERROR "configuration failed for winflexbison:\n${bisonbuildE}")
+        endif()
+
         execute_process(
         COMMAND ${CMAKE_COMMAND} --build . --config RelWithDebInfo
         WORKING_DIRECTORY ${winflexbison_SOURCE_DIR}
@@ -46,6 +56,10 @@ if(WIN32)
         ERROR_VARIABLE bisonbuildE
         )
 
+        if(NOT result EQUAL 0)
+            message(FATAL_ERROR "winflexbison build failed:\n${bisonbuildE}")
+        endif()
+
         file(COPY ${winflexbison_SOURCE_DIR}/bison/Data DESTINATION ${winflexbison_SOURCE_DIR}/bison/RelWithDebInfo/)
     endif()
 
diff --git a/thirdparty/winflexbison/minimum_cmake_version.patch b/thirdparty/winflexbison/minimum_cmake_version.patch
new file mode 100644
index 0000000000..d7de8d4cc2
--- /dev/null
+++ b/thirdparty/winflexbison/minimum_cmake_version.patch
@@ -0,0 +1,40 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index cf657a6..8757b14 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.0.0 FATAL_ERROR)
++cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+ 
+ project (winflexbison)
+ 
+diff --git a/bison/CMakeLists.txt b/bison/CMakeLists.txt
+index 55de8a1..24bbdcd 100644
+--- a/bison/CMakeLists.txt
++++ b/bison/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.0.0 FATAL_ERROR)
++cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+ 
+ set(PROJECT_NAME win_bison)
+ 
+diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
+index 4b57c62..6a292fa 100644
+--- a/common/CMakeLists.txt
++++ b/common/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.0.0 FATAL_ERROR)
++cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+ 
+ set(PROJECT_NAME winflexbison_common)
+ 
+diff --git a/flex/CMakeLists.txt b/flex/CMakeLists.txt
+index f634f81..02ba17a 100644
+--- a/flex/CMakeLists.txt
++++ b/flex/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.0.0 FATAL_ERROR)
++cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+ 
+ set(PROJECT_NAME win_flex)
+