Disabled version.rc for clang-cl (#8139)

cmake/CMakeLists.txt

@@ -193,8 +193,10 @@ else (protobuf_BUILD_SHARED_LIBS)
 endif (protobuf_BUILD_SHARED_LIBS)
 
 if (MSVC)
-  # Build with multiple processes
-  add_definitions(/MP)
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    # Build with multiple processes
+    add_definitions(/MP)
+  endif()
   # MSVC warning suppressions
   add_definitions(
     /wd4018 # 'expression' : signed/unsigned mismatch
@@ -222,12 +224,14 @@ if (MSVC)
   # Suppress linker warnings about files with no symbols defined.
   set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} /ignore:4221")
 
-  # Configure Resource Compiler
-  enable_language(RC)
-  # use English language (0x409) in resource compiler
-  set(rc_flags "/l0x409")
-  # fix rc.exe invocations because of usage of add_definitions()
-  set(CMAKE_RC_COMPILE_OBJECT "<CMAKE_RC_COMPILER> ${rc_flags} <DEFINES> /fo<OBJECT> <SOURCE>")
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+    # Configure Resource Compiler
+    enable_language(RC)
+    # use English language (0x409) in resource compiler
+    set(rc_flags "/l0x409")
+    # fix rc.exe invocations because of usage of add_definitions()
+    set(CMAKE_RC_COMPILE_OBJECT "<CMAKE_RC_COMPILER> ${rc_flags} <DEFINES> /fo<OBJECT> <SOURCE>")
+  endif()
 
   configure_file(version.rc.in ${CMAKE_CURRENT_BINARY_DIR}/version.rc @ONLY)
 endif (MSVC)

cmake/libprotobuf-lite.cmake

@@ -58,7 +58,7 @@ set(libprotobuf_lite_includes
   ${protobuf_source_dir}/src/google/protobuf/wire_format_lite.h
 )
 
-if (MSVC)
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
 set(libprotobuf_lite_rc_files
   ${CMAKE_CURRENT_BINARY_DIR}/version.rc
 )

cmake/libprotobuf.cmake

@@ -107,7 +107,7 @@ set(libprotobuf_includes
   ${protobuf_source_dir}/src/google/protobuf/wrappers.pb.h
 )
 
-if (MSVC)
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
 set(libprotobuf_rc_files
   ${CMAKE_CURRENT_BINARY_DIR}/version.rc
 )

cmake/libprotoc.cmake

@@ -163,7 +163,7 @@ set(libprotoc_headers
   ${protobuf_source_dir}/src/google/protobuf/compiler/zip_writer.h
 )
 
-if (MSVC)
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
 set(libprotoc_rc_files
   ${CMAKE_CURRENT_BINARY_DIR}/version.rc
 )

cmake/protoc.cmake

@@ -2,7 +2,7 @@ set(protoc_files
   ${protobuf_source_dir}/src/google/protobuf/compiler/main.cc
 )
 
-if (MSVC)
+if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
 set(protoc_rc_files
   ${CMAKE_CURRENT_BINARY_DIR}/version.rc
 )