From 8e7891544642c1326737c92be68edd1c90e7a660 Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@chromium.org>
Date: Wed, 30 Jan 2019 23:18:05 +0000
Subject: [PATCH] [CMake] Use correct visibility for linked libraries in CMake

When linking library dependencies, we shouldn't need to export linked
libraries to dependents. We should be explicit about this in
target_link_libraries, otherwise other targets that depend on these such
as sanitizers get repeated (and possibly even conflicting) dependencies.

Differential Revision: https://reviews.llvm.org/D57456

llvm-svn: 352688
---
 libcxx/benchmarks/CMakeLists.txt | 1 +
 libcxx/lib/CMakeLists.txt        | 9 +++++++--
 libcxxabi/src/CMakeLists.txt     | 4 ++--
 libunwind/src/CMakeLists.txt     | 4 ++--
 4 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/libcxx/benchmarks/CMakeLists.txt b/libcxx/benchmarks/CMakeLists.txt
index 3823b87..637035e 100644
--- a/libcxx/benchmarks/CMakeLists.txt
+++ b/libcxx/benchmarks/CMakeLists.txt
@@ -137,6 +137,7 @@ function(add_benchmark_test name source_file)
   add_executable(${libcxx_target} EXCLUDE_FROM_ALL ${source_file})
   add_dependencies(${libcxx_target} cxx cxx-headers google-benchmark-libcxx)
   add_dependencies(cxx-benchmarks ${libcxx_target})
+  target_link_libraries(${libcxx_target} ${LIBCXX_LIBRARIES})
   if (LIBCXX_ENABLE_SHARED)
     target_link_libraries(${libcxx_target} cxx_shared)
   else()
diff --git a/libcxx/lib/CMakeLists.txt b/libcxx/lib/CMakeLists.txt
index 24489e8..7c5096d 100644
--- a/libcxx/lib/CMakeLists.txt
+++ b/libcxx/lib/CMakeLists.txt
@@ -241,7 +241,7 @@ if (LIBCXX_ENABLE_SHARED)
   if(COMMAND llvm_setup_rpath)
     llvm_setup_rpath(cxx_shared)
   endif()
-  target_link_libraries(cxx_shared ${LIBCXX_LIBRARIES})
+  target_link_libraries(cxx_shared PRIVATE ${LIBCXX_LIBRARIES})
   set_target_properties(cxx_shared
     PROPERTIES
       LINK_FLAGS    "${LIBCXX_LINK_FLAGS}"
@@ -265,7 +265,7 @@ endif()
 # Build the static library.
 if (LIBCXX_ENABLE_STATIC)
   add_library(cxx_static STATIC ${cxx_static_sources})
-  target_link_libraries(cxx_static ${LIBCXX_LIBRARIES})
+  target_link_libraries(cxx_static PRIVATE ${LIBCXX_LIBRARIES})
   set(CMAKE_STATIC_LIBRARY_PREFIX "lib")
   set_target_properties(cxx_static
     PROPERTIES
@@ -461,3 +461,8 @@ if (NOT CMAKE_CONFIGURATION_TYPES AND (LIBCXX_INSTALL_LIBRARY OR
                       -P "${LIBCXX_BINARY_DIR}/cmake_install.cmake")
     add_custom_target(install-libcxx DEPENDS install-cxx)
 endif()
+
+# TODO: This is needed by cxx-benchmarks but this variable isn't
+# available outside of the scope of this file so we need to export
+# it. This is not necessarily the cleanest solution.
+set(LIBCXX_LIBRARIES ${LIBCXX_LIBRARIES} PARENT_SCOPE)
diff --git a/libcxxabi/src/CMakeLists.txt b/libcxxabi/src/CMakeLists.txt
index 246cfd8..66151b1 100644
--- a/libcxxabi/src/CMakeLists.txt
+++ b/libcxxabi/src/CMakeLists.txt
@@ -189,7 +189,7 @@ if (LIBCXXABI_ENABLE_SHARED)
   if(COMMAND llvm_setup_rpath)
     llvm_setup_rpath(cxxabi_shared)
   endif()
-  target_link_libraries(cxxabi_shared ${LIBCXXABI_LIBRARIES} ${LIBCXXABI_SHARED_LIBRARIES})
+  target_link_libraries(cxxabi_shared PRIVATE ${LIBCXXABI_LIBRARIES} ${LIBCXXABI_SHARED_LIBRARIES})
   set_target_properties(cxxabi_shared
                         PROPERTIES
                           CXX_EXTENSIONS
@@ -226,7 +226,7 @@ if (LIBCXXABI_ENABLE_STATIC)
     endif()
   endif()
   add_library(cxxabi_static STATIC ${cxxabi_static_sources})
-  target_link_libraries(cxxabi_static ${LIBCXXABI_LIBRARIES} ${LIBCXXABI_STATIC_LIBRARIES})
+  target_link_libraries(cxxabi_static PRIVATE ${LIBCXXABI_LIBRARIES} ${LIBCXXABI_STATIC_LIBRARIES})
   set_target_properties(cxxabi_static
                         PROPERTIES
                           CXX_EXTENSIONS
diff --git a/libunwind/src/CMakeLists.txt b/libunwind/src/CMakeLists.txt
index 080e8c5..2928a14 100644
--- a/libunwind/src/CMakeLists.txt
+++ b/libunwind/src/CMakeLists.txt
@@ -146,7 +146,7 @@ if (LIBUNWIND_ENABLE_SHARED)
   if(COMMAND llvm_setup_rpath)
     llvm_setup_rpath(unwind_shared)
   endif()
-  target_link_libraries(unwind_shared ${libraries})
+  target_link_libraries(unwind_shared PRIVATE ${libraries})
   set_target_properties(unwind_shared
                         PROPERTIES
                           LINK_FLAGS    "${LIBUNWIND_LINK_FLAGS}"
@@ -162,7 +162,7 @@ endif()
 # Build the static library.
 if (LIBUNWIND_ENABLE_STATIC)
   add_library(unwind_static STATIC ${unwind_static_sources})
-  target_link_libraries(unwind_static ${libraries})
+  target_link_libraries(unwind_static PRIVATE ${libraries})
   set_target_properties(unwind_static
                         PROPERTIES
                           LINK_FLAGS    "${LIBUNWIND_LINK_FLAGS}"
-- 
2.7.4