fix: typo for warning on C++17, support Win + 2.7

Author: henryiii

.github/workflows/ci.yml

@@ -118,14 +118,14 @@ jobs:
       shell: bash
       run: >
         cmake -S . -B build2
-        -DPYBIND17_WERROR=ON
+        -DPYBIND11_WERROR=ON
         -DDOWNLOAD_CATCH=ON
         -DDOWNLOAD_EIGEN=ON
         -DCMAKE_CXX_STANDARD=${{ matrix.max-cxx-std }}
         -DPYTHON_EXECUTABLE=$(python -c "import sys; print(sys.executable)")
 
     - name: Build C++${{ matrix.max-cxx-std }}
-      run: cmake --build build2 -j 2
+      run: cmake --build build2 -j 2 -v
 
     - name: Python tests C++${{ matrix.max-cxx-std }}
       run: cmake --build build2 --target pytest

CMakeLists.txt

@@ -181,11 +181,15 @@ endif()
 
 message(STATUS "CXX Compiler version: ${CMAKE_CXX_COMPILER_VERSION}")
 
+# Workaround for Python 2.7 and C++17 (C++14 as a warning) incompatibility
 set(clang_4plus
     "$<AND:$<CXX_COMPILER_ID:Clang>,$<NOT:$<VERSION_LESS:$<CXX_COMPILER_VERSION>,3.9>>>")
 set(no_register "$<OR:${clang_4plus},$<CXX_COMPILER_ID:AppleClang>>")
-target_compile_options(pybind11
-                       INTERFACE "$<${no_register}:-Wno-register;-Wno-deprecated-register>")
+set(cxx_no_register "$<AND:$<COMPILE_LANGUAGE:language>,${no_register}>")
+set(msvc "$<CXX_COMPILER_ID:MSVC>")
+target_compile_options(
+  pybind11 INTERFACE "$<${cxx_no_register}:-Wno-register;-Wno-deprecated-register>"
+                     "$<${msvc}:/wd5033>")
 
 add_library(embed INTERFACE)
 add_library(pybind11::embed ALIAS embed)