[PATCH] D40459: [cmake] Pass -Wl, -z, nodelete on Linux to prevent unloading

[Michał Górny via Phabricator via llvm-commits]

mgorny updated this revision to Diff 124462.
mgorny added a comment.

Updated to fix unittest failure.


https://reviews.llvm.org/D40459

Files:
  cmake/modules/HandleLLVMOptions.cmake
  unittests/Support/DynamicLibrary/CMakeLists.txt


Index: unittests/Support/DynamicLibrary/CMakeLists.txt
===================================================================
--- unittests/Support/DynamicLibrary/CMakeLists.txt
+++ unittests/Support/DynamicLibrary/CMakeLists.txt
@@ -24,5 +24,12 @@
   add_dependencies(DynamicLibraryTests ${NAME})
 endfunction(dynlib_add_module)
 
+# Revert -Wl,-z,nodelete on this test since it relies on the file
+# being unloaded.
+if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+  string(REPLACE "-Wl,-z,nodelete" "" CMAKE_SHARED_LINKER_FLAGS
+    ${CMAKE_SHARED_LINKER_FLAGS})
+endif()
+
 dynlib_add_module(PipSqueak)
 dynlib_add_module(SecondLib)
Index: cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- cmake/modules/HandleLLVMOptions.cmake
+++ cmake/modules/HandleLLVMOptions.cmake
@@ -151,6 +151,14 @@
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs")
 endif()
 
+# Pass -Wl,-z,nodelete. This makes sure our shared libraries are not unloaded
+# by dlclose(). We need that since the CLI API relies on cross-references
+# between global objects which became horribly broken when one of the libraries
+# is unloaded.
+if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,nodelete")
+endif()
+
 
 function(append value)
   foreach(variable ${ARGN})


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