[libc++abi] Do not define -Dcxxabi_shared_EXPORTS when building libc++abi

CMake sets adds that definition automatically, but we don't need
or use it.

llvm-svn: 373940

diff --git a/libcxxabi/src/CMakeLists.txt b/libcxxabi/src/CMakeLists.txt
index 8d4eb79..0bb164d 100644 (file)
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -176,7 +176,9 @@ if (LIBCXXABI_ENABLE_SHARED)
                           SOVERSION
                             "1"
                           VERSION
-                            "1.0")
+                            "1.0"
+                          DEFINE_SYMBOL
+                            "")
 
   if(LIBCXXABI_ENABLE_PIC)
     set_target_properties(cxxabi_shared PROPERTIES POSITION_INDEPENDENT_CODE ON)