[CMake] Split linked libraries for shared and static libc++

Some linker libraries are only needed for shared libc++, some only
for static libc++, combining these together in LIBCXX_LIBRARIES and
LIBCXX_INTERFACE_LIBRARIES can introduce unnecessary dependencies.

This changes splits those up into LIBCXX_SHARED_LIBRARIES and
LIBCXX_STATIC_LIBRARIES matching what libc++abi already does.

Differential Revision: https://reviews.llvm.org/D57872

llvm-svn: 358614

1 files changed, 13 insertions, 11 deletions

diff --git a/libcxx/lib/CMakeLists.txt b/libcxx/lib/CMakeLists.txt
index b3eb5c88b6c..3a562e05226 100644
--- a/libcxx/lib/CMakeLists.txt
+++ b/libcxx/lib/CMakeLists.txt
@@ -90,17 +90,6 @@ endif()
 add_library_flags_if(LIBCXX_HAVE_CXX_ATOMICS_WITH_LIB atomic)
 add_library_flags_if(MINGW "${MINGW_LIBRARIES}")
 
-# Add the unwinder library.
-if (LIBCXXABI_USE_LLVM_UNWINDER)
-  if (NOT LIBCXXABI_ENABLE_STATIC_UNWINDER AND (TARGET unwind_shared OR HAVE_LIBUNWIND))
-    add_interface_library(unwind_shared)
-  elseif (LIBCXXABI_ENABLE_STATIC_UNWINDER AND (TARGET unwind_static OR HAVE_LIBUNWIND))
-    add_interface_library(unwind_static)
-  else()
-    add_interface_library(unwind)
-  endif()
-endif()
-
 # Setup flags.
 add_link_flags_if_supported(-nodefaultlibs)
 
@@ -171,6 +160,19 @@ if (LIBCXX_ENABLE_SHARED)
   )
   cxx_set_common_defines(cxx_shared)
 
+  # Link against LLVM libunwind
+  if (LIBCXXABI_USE_LLVM_UNWINDER)
+    if (NOT LIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY AND (TARGET unwind_shared OR HAVE_LIBUNWIND))
+      target_link_libraries(cxx_shared PRIVATE unwind_shared)
+      list(APPEND LIBCXX_INTERFACE_LIBRARIES unwind_shared) # For the linker script
+    elseif (LIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY AND (TARGET unwind_static OR HAVE_LIBUNWIND))
+      # libunwind is already included in libc++abi
+    else()
+      target_link_libraries(cxx_shared PRIVATE unwind)
+      list(APPEND LIBCXX_INTERFACE_LIBRARIES unwind) # For the linker script
+    endif()
+  endif()
+
   # Link against libc++abi
   if (LIBCXX_STATICALLY_LINK_ABI_IN_SHARED_LIBRARY)
     if (APPLE)