Add BUILD_RPATH for Foundation too

Author: finagolfin

Sources/Foundation/CMakeLists.txt

@@ -159,6 +159,22 @@ if(CMAKE_SYSTEM_NAME STREQUAL Windows)
     $<TARGET_OBJECTS:CoreFoundationResources>)
 elseif(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
   target_link_options(Foundation PRIVATE "SHELL:-no-toolchain-stdlib-rpath")
+
+  execute_process(
+    COMMAND ${CMAKE_Swift_COMPILER} -print-target-info
+    OUTPUT_VARIABLE output
+    ERROR_VARIABLE error_output
+    RESULT_VARIABLE result
+  )
+  if(NOT ${result} EQUAL 0)
+    message(FATAL_ERROR "Error getting target info with\n"
+      "  `${CMAKE_Swift_COMPILER} -print-target-info`\n"
+      "Error:\n"
+      "  ${error_output}")
+  endif()
+
+  string(REGEX MATCH "\"runtimeLibraryPaths\": \\[\n\ +\"([^\"]+)\"" path ${output})
+  set_target_properties(Foundation PROPERTIES BUILD_RPATH ${CMAKE_MATCH_1})
 endif()