[clang-tidy] Don't try to build CTTestTidyModule for Windows with dylibs

In MinGW mode, it's possible to build LLVM/Clang with
LLVM_LINK_LLVM_DYLIB (which implicitly enables plugins too). Other
existing ways of building plugins on Windows is to build with
LLVM_EXPORT_SYMBOLS_FOR_PLUGINS, where each executable exports its
symbols.

With LLVM_LINK_LLVM_DYLIB, we can't generally skip building plugins
even if they are set up with PLUGIN_TOOL, as some plugins (e.g.
under clang/examples) set up that way do build properly (as
they manually call clang_target_link_libraries, which links in the
libclang-cpp.dll dylib).

For CTTestTidyModule, there's no corresponding dylib that would
provide the same exports.

Differential Revision: https://reviews.llvm.org/D121687

diff --git a/clang-tools-extra/test/CMakeLists.txt b/clang-tools-extra/test/CMakeLists.txt
index 170e5f8..26aece9 100644 (file)
--- a/clang-tools-extra/test/CMakeLists.txt
+++ b/clang-tools-extra/test/CMakeLists.txt
@@ -81,11 +81,13 @@ foreach(dep ${LLVM_UTILS_DEPS})
 endforeach()
 
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
-  llvm_add_library(
-      CTTestTidyModule
-      MODULE clang-tidy/CTTestTidyModule.cpp
-      PLUGIN_TOOL clang-tidy
-      DEPENDS clang-tidy-headers)
+  if (NOT WIN32 AND NOT LLVM_LINK_LLVM_DYLIB)
+    llvm_add_library(
+        CTTestTidyModule
+        MODULE clang-tidy/CTTestTidyModule.cpp
+        PLUGIN_TOOL clang-tidy
+        DEPENDS clang-tidy-headers)
+  endif()
 
   if(CLANG_BUILT_STANDALONE)
     # LLVMHello library is needed below