From 4a461efae6fa36aeb50e61e381dc2ecf95b83d23 Mon Sep 17 00:00:00 2001
From: Albrecht Schlosser <albrechts.fltk@online.de>
Date: Sat, 25 Nov 2023 20:30:58 +0100
Subject: CMake/Windows/MSVC: Add option to select MSVC Runtime

Selects MSVC compiler/build options known as /MT, /MTd, /MD, or /MDd.

This applies to "Visual Studio" (IDE) and "NMake Makefiles" builds.
---
 CMake/options.cmake | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'CMake')

diff --git a/CMake/options.cmake b/CMake/options.cmake
index 6e2443cfb..5dad843d0 100644
--- a/CMake/options.cmake
+++ b/CMake/options.cmake
@@ -77,6 +77,24 @@ set (OPTION_ABI_VERSION ""
 )
 set (FL_ABI_VERSION ${OPTION_ABI_VERSION})
 
+
+#######################################################################
+#  Select MSVC (Visual Studio) Runtime: DLL (/MDx) or static (/MTx)
+#  where x = 'd' for Debug builds, empty ('') for non-Debug builds.
+#  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.
+#######################################################################
+
+if (MSVC)
+  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)
+
 #######################################################################
 #  Bundled Library Options
 #######################################################################
-- 
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