Statically link llvm-cfi-verify's libraries.

Summary:
llvm-cfi-verify (D38379) introduced a potential build failure when compiling with `-DLLVM_BUILD_LLVM_DYLIB=ON -DLLVM_LINK_LLVM_DYLIB=ON`. Specific versions of cmake seem to treat the `add_subdirectory()` rule differently. It seems as if old versions of cmake BFS these rules, adding them to the fringe for expansion later. Newer versions of cmake seem to immediately execute CMakeFiles that are present in this subdirectory.

If the subdirectory is expanded through the fringe, the globbing resultant from `llvm_add_implicit_projects()` from `cmake/modules/AddLLVM.cmake:1012` means that `tools/llvm-shlib/CMakeFile.txt` gets executed before `tools/llvm-cfi-verify/lib/CMakeFile.txt`. As the latter CMakeFile adds a new library, this expansion order means that the library files required the unit tests in `unittests/tools/llvm-cfi-verify/` are not present in the dynamic library. This causes unit tests to fail as the required functions can't be found.

This change now ensures that the libraries created by `llvm-cfi-verify` are statically linked into the unit tests. As `tools/llvm-cfi-verify/lib` no longer adds anything to `llvm-shlib`, there should be no concern about the order-of-compilation.

Reviewers: skatkov, pcc

Reviewed By: skatkov, pcc

Subscribers: llvm-commits, kcc, pcc, aheejin, vlad.tsyrklevich, mgorny

Differential Revision: https://reviews.llvm.org/D39020

llvm-svn: 316059

llvm/tools/llvm-cfi-verify/lib/CMakeLists.txt

@@ -1,9 +1,12 @@
-add_llvm_library(LLVMCFIVerify
+add_library(LLVMCFIVerify
+  STATIC
   FileAnalysis.cpp
-  FileAnalysis.h
+  FileAnalysis.h)
 
-  LINK_COMPONENTS
+llvm_update_compile_flags(LLVMCFIVerify)
+llvm_map_components_to_libnames(libs
   MC
   MCParser
   Object
   Support)
+target_link_libraries(LLVMCFIVerify ${libs})

llvm/unittests/tools/llvm-cfi-verify/CMakeLists.txt

@@ -4,7 +4,6 @@ set(LLVM_LINK_COMPONENTS
   AllTargetsDescs
   AllTargetsDisassemblers
   AllTargetsInfos
-  CFIVerify
   MC
   MCParser
   Object
@@ -15,4 +14,5 @@ list(FIND LLVM_TARGETS_TO_BUILD "X86" x86_idx)
 if (NOT x86_idx LESS 0)
   add_llvm_unittest(CFIVerifyTests
     FileAnalysis.cpp)
+  target_link_libraries(CFIVerifyTests LLVMCFIVerify)
 endif()