Merge pull request verilog-to-routing#3671 from verilog-to-routing/msvc_no_fpic

Remove -fPIC flag for MSVC

Author: AmirhosseinPoolad

CMakeLists.txt

@@ -120,8 +120,10 @@ elseif(VTR_IPO_BUILD STREQUAL "auto")
         set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ON)
     else()
         message(STATUS "Building with IPO: off (auto)")
-        set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -fPIC")
-        set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fPIC")
+        if(NOT MSVC)
+            set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -fPIC")
+            set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fPIC")
+        endif()
     endif()
 else()
     message(STATUS "Building with IPO: off")
@@ -137,9 +139,10 @@ if(NOT MSVC)
     set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g3")
 endif()
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
-
+if(NOT MSVC)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
+endif()
 #
 # Warning flags
 #