amending instructions to cibuildwheel

Author: CodeByDrescher

.github/workflows/build_wheels.yml

@@ -246,7 +246,7 @@ jobs:
             CXX=clang++
             FC=flang
             CMAKE_GENERATOR=Ninja
-            CMAKE_TOOLCHAIN_FILE=D:\a\vcell-fvsolver\vcell-fvsolver\build\conan_toolchain.cmake
+            CMAKE_TOOLCHAIN_FILE=D:\\a\\vcell-fvsolver\\vcell-fvsolver\\build\\conan_toolchain.cmake
 
         # with:
         #   package-dir: .

CMakeLists.txt

@@ -123,7 +123,16 @@ elseif (MINGW)
 	if(NOT DEFINED CMAKE_CXX_COMPILER)
 		set(CMAKE_CXX_COMPILER "clang++.exe")
 	endif()
-
+elseif (WINDOWS)
+	if(NOT DEFINED CMAKE_C_COMPILER)
+		set(CMAKE_C_COMPILER "clang.exe")
+	endif()
+	if(NOT DEFINED CMAKE_CXX_COMPILER)
+		set(CMAKE_CXX_COMPILER "clang++.exe")
+	endif()
+	if(NOT DEFINED CMAKE_Fortran_COMPILER)
+		set(CMAKE_CXX_COMPILER "flang.exe")
+	endif()
 endif()
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/modules/")