Tweak CMake build on Cygwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146725 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/HandleLLVMOptions.cmake

@@ -76,7 +76,7 @@ if( LLVM_ENABLE_PIC )
     # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't
     # know how to disable this, so just force ENABLE_PIC off for now.
     message(WARNING "-fPIC not supported with Xcode.")
-  elseif( WIN32 )
+  elseif( WIN32 OR CYGWIN)
     # On Windows all code is PIC. MinGW warns if -fPIC is used.
   else()
     include(CheckCXXCompilerFlag)

unittests/CMakeLists.txt

@@ -96,7 +96,7 @@ endif()
 
 add_llvm_unittest(ExecutionEngine/JIT ${JITTestsSources})
 
-if(MINGW)
+if(MINGW OR CYGWIN)
   set_property(TARGET JITTests PROPERTY LINK_FLAGS -Wl,--export-all-symbols)
 endif()