From 57017a166c8f46efb2b9c7fcf0b5d36adb732f30 Mon Sep 17 00:00:00 2001
From: Magne <magne.sjaastad@ceetronsolutions.com>
Date: Fri, 9 May 2025 14:00:32 +0200
Subject: [PATCH] Add minimum requirements for CMake, gcc and clang

On Linux, link with stdc++exp
Define requirements in README
---
 ApplicationLibCode/CMakeLists.txt             |  7 +++--
 CMakeLists.txt                                | 26 +++++++++++++++++++
 README.md                                     |  7 +++++
 .../Ert/cmake/Modules/FindCXX11Features.cmake |  2 --
 4 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/ApplicationLibCode/CMakeLists.txt b/ApplicationLibCode/CMakeLists.txt
index 9fcb9acc26..b91696f12b 100644
--- a/ApplicationLibCode/CMakeLists.txt
+++ b/ApplicationLibCode/CMakeLists.txt
@@ -303,10 +303,13 @@ set(LINK_LIBRARIES
     ${RI_LIBRARIES}
 )
 
-# According to ivarun this is needed on OpenSuse, and Fedora. See:
-# https://github.com/OPM/ResInsight/pull/7
 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+  # According to ivarun rt is needed on OpenSuse, and Fedora. See:
+  # https://github.com/OPM/ResInsight/pull/7
   list(APPEND EXTERNAL_LINK_LIBRARIES rt)
+
+  # stdc++exp is required for std::stacktrace
+  list(APPEND EXTERNAL_LINK_LIBRARIES stdc++exp)
 endif()
 
 target_link_libraries(
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f07e25d2b..1746e15fd0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,11 +1,37 @@
 # The way boost is configured and used in Boost 1.86 requires CMake 3.26
 cmake_minimum_required(VERSION 3.26)
 
+# Check if CMake version is 4.0 or higher
+if(CMAKE_VERSION VERSION_GREATER_EQUAL 4.0)
+  message(
+    FATAL_ERROR
+      "CMake version ${CMAKE_VERSION} detected. We are investigating issues for CMake 4. Use CMake 3.x to build ResInsight."
+  )
+endif()
+
 include(CheckCSourceCompiles)
 include(FetchContent)
 
 project(ResInsight)
 
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 13.0)
+    message(
+      FATAL_ERROR
+        "Minimum GCC version is 13, detected version: ${CMAKE_CXX_COMPILER_VERSION}"
+    )
+  endif()
+endif()
+
+if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0)
+    message(
+      FATAL_ERROR
+        "Minimum supported version is Clang 19, detected version: ${CMAKE_CXX_COMPILER_VERSION}"
+    )
+  endif()
+endif()
+
 # Ensure all binary files ensd up in the same folder as the executable
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
 
diff --git a/README.md b/README.md
index cf564f6dea..b1a92829f5 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,13 @@ ResInsight is cross-platform with automated testing on:
 ```
 git clone git://github.com/OPM/ResInsight.git
 ```
+### Minimum Requirements
+gcc 13
+clang 19
+CMake 3.15 (CMake 4 is currently not supported)
+MSVC 2022 17.4
+
+These requirements are defined by used features in c++23 like std::stacktrace and std::expected.
 
 ### Dependencies
 Most dependencies are managed using vcpkg as defined in [vcpkg.json](https://github.com/OPM/ResInsight/blob/dev/vcpkg.json)
diff --git a/ThirdParty/Ert/cmake/Modules/FindCXX11Features.cmake b/ThirdParty/Ert/cmake/Modules/FindCXX11Features.cmake
index 13b25e3856..cd942ad274 100644
--- a/ThirdParty/Ert/cmake/Modules/FindCXX11Features.cmake
+++ b/ThirdParty/Ert/cmake/Modules/FindCXX11Features.cmake
@@ -11,8 +11,6 @@ if (NOT MSVC)
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     elseif(COMPILER_SUPPORTS_CXX0X)
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
-    else()
-        message(SEND_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
     endif()
 endif()