From b595db30d46f9ace877540c073a7a3e7e423aaa7 Mon Sep 17 00:00:00 2001
From: Albrecht Schlosser <albrechts.fltk@online.de>
Date: Tue, 3 Sep 2024 11:17:58 +0200
Subject: [PATCH] CMake/Windows: enable MSVC runtime DLL option for Clang
 (#1058)

User @supsm reported that using LLVM/clang to compile together with
the MSVC linker should support the MSVC runtime DLL selection.

This commit enables the option on Windows except MinGW and MSYS
rather than MSVC only.
---
 CMake/options.cmake | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/CMake/options.cmake b/CMake/options.cmake
index 45dba4cde..2f3b36337 100644
--- a/CMake/options.cmake
+++ b/CMake/options.cmake
@@ -85,16 +85,17 @@ set(FL_ABI_VERSION ${FLTK_ABI_VERSION})
 #  Note: this might be handled better by the 'MSVC_RUNTIME_LIBRARY'
 #  target property for each target rather than setting a global
 #  CMake variable - but this version does the latter.
+#  This also applies when using LLVM/clang on Windows (#1058).
 #######################################################################
 
-if(MSVC)
+if(WIN32 AND NOT MINGW AND NOT MSYS)
   option(FLTK_MSVC_RUNTIME_DLL "use MSVC Runtime-DLL (/MDx)" ON)
   if(FLTK_MSVC_RUNTIME_DLL)
     set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
   else()
     set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
   endif()
-endif(MSVC)
+endif(WIN32 AND NOT MINGW AND NOT MSYS)
 
 #######################################################################