From df839cfda09dbadc26b8be635f27da75f1f27190 Mon Sep 17 00:00:00 2001
From: Tom Stellard <tstellar@redhat.com>
Date: Wed, 22 Jan 2020 22:06:56 +0000
Subject: [PATCH] [cmake] Fix clang builds with BUILD_SHARED=ON and
 CLANG_LINK_CLANG_DYLIB=ON

Summary:
We were linking all the clang objects and shared libraries into
libclang-cpp.so, which was causing the command line options to be
registered twice.

Reviewers: beanz, mgorny

Reviewed By: beanz, mgorny

Subscribers: mgorny, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D68520
---
 clang/tools/clang-shlib/CMakeLists.txt | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/clang/tools/clang-shlib/CMakeLists.txt b/clang/tools/clang-shlib/CMakeLists.txt
index a0fc8f6..16fc8a0c 100644
--- a/clang/tools/clang-shlib/CMakeLists.txt
+++ b/clang/tools/clang-shlib/CMakeLists.txt
@@ -14,9 +14,17 @@ foreach (lib ${clang_libs})
     list(APPEND _OBJECTS $<TARGET_OBJECTS:obj.${lib}>)
   endif()
   list(APPEND _DEPS $<TARGET_PROPERTY:${lib},INTERFACE_LINK_LIBRARIES>)
-  list(APPEND _DEPS $<TARGET_PROPERTY:${lib},LINK_LIBRARIES>)
+  get_target_property(interface ${lib} LINK_LIBRARIES)
+  if (interface)
+    list(APPEND _DEPS ${interface})
+  endif()
 endforeach ()
 
+# clang libraries are redundant since we are linking all the individual
+# object files into libclang-cpp.so, so filter them out from _DEPS.
+# This avoids problems with LLVM global data when building with
+# BUILD_SHARED_LIBS=ON
+list(FILTER _DEPS EXCLUDE REGEX "^clang")
 if (CLANG_LINK_CLANG_DYLIB)
   set(INSTALL_WITH_TOOLCHAIN INSTALL_WITH_TOOLCHAIN)
 endif()
-- 
2.7.4