[flang] Fix building against clang dylib

Differential Revision: https://reviews.llvm.org/D136606

flang/lib/Frontend/CMakeLists.txt

@@ -12,7 +12,6 @@ add_flang_library(flangFrontend
   TextDiagnostic.cpp
 
   DEPENDS
-  clangBasic
   FIRBuilder
   FIRDialect
   FIRSupport
@@ -27,8 +26,6 @@ add_flang_library(flangFrontend
   FortranEvaluate
   FortranCommon
   FortranLower
-  clangBasic
-  clangDriver
   FIRDialect
   FIRSupport
   FIRBuilder
@@ -50,3 +47,15 @@ add_flang_library(flangFrontend
   FrontendOpenACC
   FrontendOpenMP
 )
+
+if(CLANG_LINK_CLANG_DYLIB)
+  add_dependencies(flangFrontend clang-cpp)
+else()
+  add_dependencies(flangFrontend clangBasic)
+endif()
+
+clang_target_link_libraries(flangFrontend
+  PRIVATE
+  clangBasic
+  clangDriver
+)

flang/lib/FrontendTool/CMakeLists.txt

@@ -5,15 +5,24 @@ add_flang_library(flangFrontendTool
   # This makes sure that the MLIR dependencies of flangFrontend (which are
   # transitively required here) are generated before this target is build.
   flangFrontend
-  clangBasic
 
   LINK_LIBS
   flangFrontend
-  clangBasic
-  clangDriver
   MLIRPass
 
   LINK_COMPONENTS
   Option
   Support
 )
+
+if(CLANG_LINK_CLANG_DYLIB)
+  add_dependencies(flangFrontend clang-cpp)
+else()
+  add_dependencies(flangFrontendTool clangBasic)
+endif()
+
+clang_target_link_libraries(flangFrontendTool
+  PRIVATE
+  clangBasic
+  clangDriver
+)