Switch Windows MSVC runtime from dynamic (/MD) to static (/MT)

Set CMAKE_MSVC_RUNTIME_LIBRARY to MultiThreaded (static) before any
FetchContent_MakeAvailable call so all subprojects (llama.cpp, GTest)
inherit the same CRT.  Static linking embeds msvcp140/vcruntime140 into
jllama.dll, removing the runtime DLL requirement on end-user machines.

Also flip gtest_force_shared_crt to OFF so GoogleTest uses the same
static CRT; mixing /MT and /MD in a single link is a linker error.

Bump cmake_minimum_required to 3.15 for CMAKE_MSVC_RUNTIME_LIBRARY support.

https://claude.ai/code/session_017esAFB4PjHUjGBqWhbWrXY

Author: claude

CMakeLists.txt

@@ -1,7 +1,17 @@
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.15)
 
 project(jllama CXX)
 
+# Use static MSVC runtime (/MT) instead of the default DLL runtime (/MD).
+# This embeds the C++ runtime into jllama.dll so msvcp140.dll / vcruntime140.dll
+# are not required on the end-user's machine.
+# Must be set before any FetchContent_MakeAvailable() so that llama.cpp and all
+# other subprojects inherit the same CRT choice (mixing /MT and /MD in a single
+# link is a linker error).
+if(MSVC)
+    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>" CACHE STRING "" FORCE)
+endif()
+
 include(FetchContent)
 
 set(BUILD_SHARED_LIBS ON)
@@ -273,8 +283,9 @@ if(BUILD_TESTING)
         GIT_REPOSITORY https://github.com/google/googletest.git
         GIT_TAG        v1.15.2
     )
-    # Prevent GTest from overriding our compiler/linker settings on Windows
-    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+    # Keep GTest on the same CRT as the rest of the project.
+    # OFF means GTest respects CMAKE_MSVC_RUNTIME_LIBRARY (static /MT here).
+    set(gtest_force_shared_crt OFF CACHE BOOL "" FORCE)
     FetchContent_MakeAvailable(googletest)
 
     enable_testing()