[clang-repl][CMake][MSVC] Wrap /EXPORT linker option for ICX (llvm#112867)

The Intel C++ Compiler (ICX) passes linker flags through the driver
unlike MSVC and clang-cl, and therefore needs them to be prefixed with
`/Qoption,link` (the equivalent of -Wl, for gcc on *nix).

Use the `LINKER:` prefix for the `/EXPORT:` options in clang-repl, this
expands to the correct flag for ICX and nothing for MSVC / clang-cl.

RFC:
https://discourse.llvm.org/t/rfc-cmake-linker-flags-need-wl-equivalent-for-intel-c-icx-on-windows/82446

Author: Maetveis

clang/tools/clang-repl/CMakeLists.txt

@@ -48,11 +48,9 @@ if(MSVC)
   endif()
 
   # List to '/EXPORT:sym0 /EXPORT:sym1 /EXPORT:sym2 ...'
-  foreach(sym ${clang_repl_exports})
-    set(clang_repl_link_str "${clang_repl_link_str} /EXPORT:${sym}")
-  endforeach(sym ${clang_repl_exports})
+  list(TRANSFORM clang_repl_exports PREPEND "LINKER:/EXPORT:")
 
-  set_property(TARGET clang-repl APPEND_STRING PROPERTY LINK_FLAGS ${clang_repl_link_str})
+  set_property(TARGET clang-repl APPEND PROPERTY LINK_OPTIONS ${clang_repl_exports})
 
 endif(MSVC)
 

clang/unittests/Interpreter/CMakeLists.txt

@@ -67,10 +67,7 @@ if(MSVC)
   endif()
 
   # List to '/EXPORT:sym0 /EXPORT:sym1 /EXPORT:sym2 ...'
-  foreach(sym ${ClangReplInterpreterTests_exports})
-    set(ClangReplInterpreterTests_link_str "${ClangReplInterpreterTests_link_str} /EXPORT:${sym}")
-  endforeach(sym ${ClangReplInterpreterTests_exports})
-
-  set_property(TARGET ClangReplInterpreterTests APPEND_STRING PROPERTY LINK_FLAGS ${ClangReplInterpreterTests_link_str})
+  list(TRANSFORM ClangReplInterpreterTests_exports PREPEND "LINKER:/EXPORT:")
+  set_property(TARGET ClangReplInterpreterTests APPEND PROPERTY LINK_OPTIONS ${ClangReplInterpreterTests_exports})
 
 endif(MSVC)