diff --git a/llvm/examples/Bye/CMakeLists.txt b/llvm/examples/Bye/CMakeLists.txt
--- a/llvm/examples/Bye/CMakeLists.txt
+++ b/llvm/examples/Bye/CMakeLists.txt
@@ -6,7 +6,7 @@
 # but expects them to exist in the process loading the plugin. This doesn't
 # work with DLLs on Windows (where a shared library can't have undefined
 # references), so just skip this example on Windows.
-if (NOT WIN32)
+if (NOT WIN32 AND NOT CYGWIN)
   add_llvm_pass_plugin(Bye
     Bye.cpp
     DEPENDS
diff --git a/llvm/examples/IRTransforms/CMakeLists.txt b/llvm/examples/IRTransforms/CMakeLists.txt
--- a/llvm/examples/IRTransforms/CMakeLists.txt
+++ b/llvm/examples/IRTransforms/CMakeLists.txt
@@ -6,7 +6,7 @@
 # but expects them to exist in the process loading the plugin. This doesn't
 # work with DLLs on Windows (where a shared library can't have undefined
 # references), so just skip this example on Windows.
-if (NOT WIN32)
+if (NOT WIN32 AND NOT CYGWIN)
   add_llvm_pass_plugin(ExampleIRTransforms
     SimplifyCFG.cpp
     DEPENDS
diff --git a/llvm/unittests/Analysis/InlineAdvisorPlugin/CMakeLists.txt b/llvm/unittests/Analysis/InlineAdvisorPlugin/CMakeLists.txt
--- a/llvm/unittests/Analysis/InlineAdvisorPlugin/CMakeLists.txt
+++ b/llvm/unittests/Analysis/InlineAdvisorPlugin/CMakeLists.txt
@@ -2,7 +2,7 @@
 # libraries, but expects them to exist in the process loading the plugin. This 
 # doesn't work with DLLs on Windows (where a shared library can't have undefined
 # references), so just skip this testcase on Windows.
-if (NOT WIN32)
+if (NOT WIN32 AND NOT CYGWIN)
   unset(LLVM_LINK_COMPONENTS)
   add_llvm_library(InlineAdvisorPlugin MODULE BUILDTREE_ONLY
     InlineAdvisorPlugin.cpp
diff --git a/llvm/unittests/Analysis/InlineOrderPlugin/CMakeLists.txt b/llvm/unittests/Analysis/InlineOrderPlugin/CMakeLists.txt
--- a/llvm/unittests/Analysis/InlineOrderPlugin/CMakeLists.txt
+++ b/llvm/unittests/Analysis/InlineOrderPlugin/CMakeLists.txt
@@ -2,7 +2,7 @@
 # libraries, but expects them to exist in the process loading the plugin. This 
 # doesn't work with DLLs on Windows (where a shared library can't have undefined
 # references), so just skip this testcase on Windows.
-if (NOT WIN32)
+if (NOT WIN32 AND NOT CYGWIN)
   unset(LLVM_LINK_COMPONENTS)
   add_llvm_library(InlineOrderPlugin MODULE BUILDTREE_ONLY
     InlineOrderPlugin.cpp
diff --git a/llvm/unittests/Passes/Plugins/CMakeLists.txt b/llvm/unittests/Passes/Plugins/CMakeLists.txt
--- a/llvm/unittests/Passes/Plugins/CMakeLists.txt
+++ b/llvm/unittests/Passes/Plugins/CMakeLists.txt
@@ -2,7 +2,7 @@
 # but expects them to exist in the process loading the plugin. This doesn't
 # work with DLLs on Windows (where a shared library can't have undefined
 # references), so just skip this testcase on Windows.
-if (NOT WIN32)
+if (NOT WIN32 AND NOT CYGWIN)
   set(LLVM_LINK_COMPONENTS Support Passes Core AsmParser)
   add_llvm_unittest(PluginsTests
     PluginsTest.cpp