Correctly set _GLIBCXX_USE_CXX11_ABI pybind compile options

Author: huydhn

CMakeLists.txt

@@ -716,15 +716,27 @@ if(EXECUTORCH_BUILD_PYBIND)
   endif()
 
   # compile options for pybind
-  set(_pybind_compile_options
-      -Wno-deprecated-declarations
-      -fPIC
-      -frtti
-      -fexceptions
-      # libtorch is built with the old ABI, so we need to do the same for any
-      # .cpp files that include torch, c10, or ATen targets.
-      -D_GLIBCXX_USE_CXX11_ABI=0
-  )
+  if(EXECUTORCH_DO_NOT_USE_CXX11_ABI)
+    set(_pybind_compile_options
+        -Wno-deprecated-declarations
+        -fPIC
+        -frtti
+        -fexceptions
+        # libtorch is built with the old ABI, so we need to do the same for any
+        # .cpp files that include torch, c10, or ATen targets. Note that PyTorch
+        # nightly binary is built with _GLIBCXX_USE_CXX11_ABI set to 0 while its
+        # CI build sets this to 1 (default)
+        -D_GLIBCXX_USE_CXX11_ABI=0
+    )
+  else()
+    set(_pybind_compile_options
+        -Wno-deprecated-declarations
+        -fPIC
+        -frtti
+        -fexceptions
+    )
+  endif()
+
   # util lib
   add_library(
     util ${CMAKE_CURRENT_SOURCE_DIR}/extension/evalue_util/print_evalue.cpp