Cleanup VCRuntime140.dll dependency from native components

1 files changed, 21 insertions, 3 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c2caeed625..b30e43a42c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -530,6 +530,15 @@ if (WIN32)
   add_compile_options($<$<OR:$<CONFIG:Release>,$<CONFIG:Relwithdebinfo>>:/GL>)
   add_compile_options($<$<OR:$<OR:$<CONFIG:Release>,$<CONFIG:Relwithdebinfo>>,$<CONFIG:Checked>>:/O1>)
 
+  # Statically linked CRT (libcmt[d].lib, libvcruntime[d].lib and libucrt[d].lib) by default. This is done to avoid
+  # linking in VCRUNTIME140.DLL for a simplified xcopy experience by reducing the dependency on VC REDIST.
+  #
+  # For Release builds, we shall dynamically link into uCRT [ucrtbase.dll] (which is pushed down as a Windows Update on downlevel OS) but
+  # wont do the same for debug/checked builds since ucrtbased.dll is not redistributable and Debug/Checked builds are not
+  # production-time scenarios.
+  add_compile_options($<$<OR:$<CONFIG:Release>,$<CONFIG:Relwithdebinfo>>:/MT>)
+  add_compile_options($<$<OR:$<CONFIG:Debug>,$<CONFIG:Checked>>:/MTd>)
+
   if (CLR_CMAKE_PLATFORM_ARCH_AMD64)
   # The generator expression in the following command means that the /homeparams option is added only for debug builds
   add_compile_options($<$<CONFIG:Debug>:/homeparams>) # Force parameters passed in registers to be written to the stack
@@ -573,16 +582,24 @@ if (WIN32)
   set(CMAKE_SHARED_LINKER_FLAGS_CHECKED "${CMAKE_SHARED_LINKER_FLAGS_CHECKED} /OPT:REF /OPT:NOICF /NOVCFEATURE ${NO_INCREMENTAL_LINKER_FLAGS}")
   set(CMAKE_STATIC_LINKER_FLAGS_CHECKED "${CMAKE_STATIC_LINKER_FLAGS_CHECKED}")
   set(CMAKE_EXE_LINKER_FLAGS_CHECKED "${CMAKE_EXE_LINKER_FLAGS_CHECKED} /OPT:REF /OPT:NOICF ${NO_INCREMENTAL_LINKER_FLAGS}")
-
+  
   # Release build specific flags
   set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG /OPT:REF /OPT:ICF ${NO_INCREMENTAL_LINKER_FLAGS}")
   set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG")
   set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG /OPT:REF /OPT:ICF ${NO_INCREMENTAL_LINKER_FLAGS}")
-
+  
+  # Force uCRT to be dynamically linked for Release build
+  set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /NODEFAULTLIB:libucrt.lib /DEFAULTLIB:ucrt.lib")
+  set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /NODEFAULTLIB:libucrt.lib /DEFAULTLIB:ucrt.lib")
+  
   # ReleaseWithDebugInfo build specific flags
   set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} /LTCG /OPT:REF /OPT:ICF ${NO_INCREMENTAL_LINKER_FLAGS}")
   set(CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO} /LTCG")
   set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /LTCG /OPT:REF /OPT:ICF ${NO_INCREMENTAL_LINKER_FLAGS}")
+  
+  # Force uCRT to be dynamically linked for Release build
+  set(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO} /NODEFAULTLIB:libucrt.lib /DEFAULTLIB:ucrt.lib")
+  set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /NODEFAULTLIB:libucrt.lib /DEFAULTLIB:ucrt.lib")
 
 # Temporary until cmake has VS generators for arm64
 if(CLR_CMAKE_PLATFORM_ARCH_ARM64)
@@ -727,7 +744,8 @@ if (WIN32)
     # ARM64_TODO: Enable this for Windows Arm64
     if (NOT CLR_CMAKE_PLATFORM_ARCH_ARM64)
       # Define the uCRT lib reference
-      set(STATIC_MT_UCRT_LIB  "libucrt$<$<OR:$<CONFIG:Debug>,$<CONFIG:Checked>>:d>.lib")
+      set(STATIC_UCRT_LIB  "libucrt$<$<OR:$<CONFIG:Debug>,$<CONFIG:Checked>>:d>.lib")
+      set(DYNAMIC_UCRT_LIB  "ucrt$<$<OR:$<CONFIG:Debug>,$<CONFIG:Checked>>:d>.lib")
     endif()
 
 endif(WIN32)