fix: avoid vendor libstdc++ conflicts

CMakeLists.txt

@@ -18,9 +18,6 @@ set(CMAKE_INSTALL_PREFIX "${CMAKE_SOURCE_DIR}/output" CACHE PATH "" FORCE)
 set(CMAKE_BUILD_RPATH "\$ORIGIN:\$ORIGIN/../lib")
 set(CMAKE_INSTALL_RPATH "\$ORIGIN:\$ORIGIN/../lib")
 
-# Use transitive RPATH so CLion can run build-tree test executables without
-# manually setting LD_LIBRARY_PATH for indirect third-party dependencies.
-add_link_options(-Wl,--disable-new-dtags)
 set(CMAKE_BUILD_WITH_INSTALL_RPATH OFF)
 set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 

cmake/FindExternalLib.cmake

@@ -55,7 +55,17 @@ function(setup_external_libs ARCH)
 
         # ---- library dirs ----
         if(EXISTS "${FULL_PATH}/lib")
-            list(APPEND LIBRARY_DIRS "${FULL_PATH}/lib")
+            file(GLOB _BUNDLED_LIBSTDCXX_FILES
+                    "${FULL_PATH}/lib/libstdc++.so"
+                    "${FULL_PATH}/lib/libstdc++.so.*"
+            )
+            if(_BUNDLED_LIBSTDCXX_FILES)
+                message(STATUS
+                        "${LIB_NAME}: excluding vendor lib directory from global "
+                        "link paths because it contains a private libstdc++")
+            else()
+                list(APPEND LIBRARY_DIRS "${FULL_PATH}/lib")
+            endif()
             set(HAS_LIB TRUE)
 
             # Collect shared libs for install: *.so and *.so.*