diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -564,17 +564,21 @@
   set(LLVM_DYLIB_COMPONENTS "all" CACHE STRING
     "Semicolon-separated list of components to include in libLLVM, or \"all\".")
 endif()
-option(LLVM_LINK_LLVM_DYLIB "Link tools against the libllvm dynamic library" OFF)
+
 if(MSVC)
   option(LLVM_BUILD_LLVM_C_DYLIB "Build LLVM-C.dll (Windows only)" ON)
+  # Set this variable to OFF here so it can't be set with a command-line
+  # argument.
+  set (LLVM_LINK_LLVM_DYLIB OFF)
 else()
+  option(LLVM_LINK_LLVM_DYLIB "Link tools against the libllvm dynamic library" OFF)
   option(LLVM_BUILD_LLVM_C_DYLIB "Build libllvm-c re-export library (Darwin only)" OFF)
+  set(LLVM_BUILD_LLVM_DYLIB_default OFF)
+  if(LLVM_LINK_LLVM_DYLIB OR LLVM_BUILD_LLVM_C_DYLIB)
+    set(LLVM_BUILD_LLVM_DYLIB_default ON)
+  endif()
+  option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" ${LLVM_BUILD_LLVM_DYLIB_default})
 endif()
-set(LLVM_BUILD_LLVM_DYLIB_default OFF)
-if(LLVM_LINK_LLVM_DYLIB OR (LLVM_BUILD_LLVM_C_DYLIB AND NOT MSVC))
-  set(LLVM_BUILD_LLVM_DYLIB_default ON)
-endif()
-option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" ${LLVM_BUILD_LLVM_DYLIB_default})
 
 option(LLVM_OPTIMIZED_TABLEGEN "Force TableGen to be built with optimization" OFF)
 if(CMAKE_CROSSCOMPILING OR (LLVM_OPTIMIZED_TABLEGEN AND (LLVM_ENABLE_ASSERTIONS OR CMAKE_CONFIGURATION_TYPES)))
diff --git a/llvm/docs/BuildingADistribution.rst b/llvm/docs/BuildingADistribution.rst
--- a/llvm/docs/BuildingADistribution.rst
+++ b/llvm/docs/BuildingADistribution.rst
@@ -96,6 +96,7 @@
 want to distribute LLVM as a shared library for use in a tool, the recommended
 method is using *LLVM_BUILD_LLVM_DYLIB*, and you can use *LLVM_DYLIB_COMPONENTS*
 to configure which LLVM components are part of libLLVM.
+Note: *LLVM_BUILD_LLVM_DYLIB* is not available on Windows.
 
 Options for Optimizing LLVM
 ===========================
diff --git a/llvm/docs/CMake.rst b/llvm/docs/CMake.rst
--- a/llvm/docs/CMake.rst
+++ b/llvm/docs/CMake.rst
@@ -570,11 +570,13 @@
   is also ON.
   The components in the library can be customised by setting LLVM_DYLIB_COMPONENTS
   to a list of the desired components.
+  This option is not available on Windows.
 
 **LLVM_LINK_LLVM_DYLIB**:BOOL
   If enabled, tools will be linked with the libLLVM shared library. Defaults
   to OFF. Setting LLVM_LINK_LLVM_DYLIB to ON also sets LLVM_BUILD_LLVM_DYLIB
   to ON.
+  This option is not available on Windows.
 
 **BUILD_SHARED_LIBS**:BOOL
   Flag indicating if each LLVM component (e.g. Support) is built as a shared
diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
--- a/llvm/docs/GettingStarted.rst
+++ b/llvm/docs/GettingStarted.rst
@@ -622,7 +622,8 @@
 |                         | default set of LLVM components that can be         |
 |                         | overridden with ``LLVM_DYLIB_COMPONENTS``. The     |
 |                         | default contains most of LLVM and is defined in    |
-|                         | ``tools/llvm-shlib/CMakelists.txt``.               |
+|                         | ``tools/llvm-shlib/CMakelists.txt``. This option is|
+|                         | not avialable on Windows.                          |
 +-------------------------+----------------------------------------------------+
 | LLVM_OPTIMIZED_TABLEGEN | Builds a release tablegen that gets used during    |
 |                         | the LLVM build. This can dramatically speed up     |
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -58,6 +58,9 @@
 * The BasicBlockPass, BBPassManager and all their uses were deleted in
   `this revision <https://reviews.llvm.org/rG9f0ff0b2634bab6a5be8dace005c9eb24d386dd1>`_.
 
+* The LLVM_BUILD_LLVM_DYLIB and LLVM_LINK_LLVM_DYLIB CMake options are no longer
+  available on Windows.
+
 .. NOTE
    If you would like to document a larger change, then you can add a
    subsection about it right here. You can copy the following boilerplate