[CMake] Unbreak BUILD_SHARED_LIBS workflow

[davezarzycki]

Summary

Due to recent timer changes, we need to add LLVM's Core library to avoid undefined symbol errors at link time (llvm::TimePassesIsEnabled) when using LLVM's BUILD_SHARED_LIBS workflow.

[thakis]

Can you link to the recent timer changes?

[davezarzycki]

I haven't proven that r329684 is the source of the regression, but it is the only timer related change in the last 24 hours as far as I can tell.

[thakis]

Thanks for the pointer! I commented on https://reviews.llvm.org/D43578; I'm hoping there's a fix that doesn't require making so many libs depend on clang's IR library.

[davezarzycki]

Great! I'll revisit this patch in a week and see if it is still needed. Hopefully the author of D43578 will make this patch unnecessary by then.

lib/Frontend/CMakeLists.txt

 add_subdirectory(Rewrite)
 
 set(LLVM_LINK_COMPONENTS
+  Core
   BitReader
   Option
   ProfileData
   Support
   )
 
 set(optional_deps intrinsics_gen)
 if (CLANG_BUILT_STANDALONE)

lib/Lex/CMakeLists.txt

 # TODO: Add -maltivec when ARCH is PowerPC.
 
-set(LLVM_LINK_COMPONENTS support)
+set(LLVM_LINK_COMPONENTS
+  Core
+  support
+  )
 
 add_clang_library(clangLex
   HeaderMap.cpp
   HeaderSearch.cpp
   Lexer.cpp
   LiteralSupport.cpp
   MacroArgs.cpp
   MacroInfo.cpp

lib/Parse/CMakeLists.txt

 set(LLVM_LINK_COMPONENTS
+  Core
   MC
   MCParser
   Support
   )
 
 add_clang_library(clangParse
   ParseAST.cpp
   ParseCXXInlineMethods.cpp

lib/Sema/CMakeLists.txt

 set(LLVM_LINK_COMPONENTS
+  Core
   Support
   )
 
 if (MSVC)
   set_source_files_properties(SemaDeclAttr.cpp PROPERTIES COMPILE_FLAGS /bigobj)
   set_source_files_properties(SemaExpr.cpp PROPERTIES COMPILE_FLAGS /bigobj)
 endif()