fix: fix detect_architecture for vcvarsall

Author: aminya

src/Index.cmake

@@ -69,7 +69,7 @@ macro(project_options)
 
   # set warning message level
   if(${ProjectOptions_WARNINGS_AS_ERRORS})
-    set(WARNINGS_AS_ERRORS ${ProjectOptions_WARNINGS_AS_ERRORS})  
+    set(WARNINGS_AS_ERRORS ${ProjectOptions_WARNINGS_AS_ERRORS})
     set(WARNING_MESSAGE SEND_ERROR)
   else()
     set(WARNING_MESSAGE WARNING)
@@ -114,7 +114,7 @@ macro(project_options)
     MSVC_WARNINGS=${ProjectOptions_MSVC_WARNINGS}
     CLANG_WARNINGS=${ProjectOptions_CLANG_WARNINGS}
     GCC_WARNINGS=${ProjectOptions_GCC_WARNINGS})
-  
+
   include("${ProjectOptions_SRC_DIR}/Tests.cmake")
   if(${ProjectOptions_ENABLE_COVERAGE})
     enable_coverage(project_options)

src/VCEnvironment.cmake

@@ -1,5 +1,29 @@
 include("${ProjectOptions_SRC_DIR}/Utilities.cmake")
 
+macro(detect_architecture)
+  # detect the architecture
+  string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" CMAKE_SYSTEM_PROCESSOR_LOWER)
+  if(CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL x86 OR CMAKE_SYSTEM_PROCESSOR_LOWER MATCHES "^i[3456]86$")
+    set(VCVARSALL_ARCH x86)
+  elseif(
+    CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL x64
+    OR CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL x86_64
+    OR CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL amd64)
+    set(VCVARSALL_ARCH x64)
+  elseif(CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL arm)
+    set(VCVARSALL_ARCH arm)
+  elseif(CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL arm64 OR CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL aarch64)
+    set(VCVARSALL_ARCH arm64)
+  else()
+    if(CMAKE_HOST_SYSTEM_PROCESSOR)
+      set(VCVARSALL_ARCH ${CMAKE_HOST_SYSTEM_PROCESSOR})
+    else()
+      set(VCVARSALL_ARCH x64)
+      message(STATUS "Unkown architecture CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR_LOWER} - using x64")
+    endif()
+  endif()
+endmacro()
+
 # Run vcvarsall.bat and set CMake environment variables
 function(run_vcvarsall)
   # if MSVC but VSCMD_VER is not set, which means vcvarsall has not run
@@ -19,18 +43,7 @@ function(run_vcvarsall)
 
     if(EXISTS ${VCVARSALL_FILE})
       # detect the architecture
-      string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" CMAKE_SYSTEM_PROCESSOR_LOWER)
-      if(CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL x86 OR CMAKE_SYSTEM_PROCESSOR_LOWER MATCHES "^i[3456]86$")
-        set(VCVARSALL_ARCH x86)
-      elseif(CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL x86_64 OR CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL amd64)
-        set(VCVARSALL_ARCH x64)
-      elseif(CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL arm)
-        set(VCVARSALL_ARCH arm)
-      elseif(CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL arm64 OR CMAKE_SYSTEM_PROCESSOR_LOWER STREQUAL aarch64)
-        set(VCVARSALL_ARCH arm64)
-      else()
-        message(WARNING "Unkown architecture: ${lowercase_CMAKE_HOST_SYSTEM_PROCESSOR}")
-      endif()
+      detect_architecture()
 
       # run vcvarsall and print the environment variables
       message(STATUS "Running `${VCVARSALL_FILE} ${VCVARSALL_ARCH}` to set up the MSVC environment")