Support building with clang on Windows

.gitignore

@@ -27,6 +27,7 @@ CMakePresets.json
 CMakeUserPresets.json
 .vs/
 out/
+\.clangd
 
 # vcpkg
 vcpkg_installed*/

CMakeLists.txt

@@ -229,17 +229,23 @@ if("${CMAKE_SIZEOF_VOID_P}" EQUAL "4")
     set(IS_32BIT TRUE)
 endif()
 
-set(CLANG_COMPILER_ID_REGEX "^(Apple)?[Cc]lang$")
+if("${CMAKE_CXX_COMPILER}" MATCHES "clang-cl(.exe)?$")
-if("${CMAKE_C_COMPILER}" MATCHES "clang$"
+    # clang-cl uses MSVC compiler flags
+    set(MSVC 1)
+    set(CMAKE_COMPILER_IS_CLANG_MSVC 1)
+else()
+    set(CLANG_COMPILER_ID_REGEX "^(Apple)?[Cc]lang$")
+    if("${CMAKE_C_COMPILER}" MATCHES "clang$"
             OR "${CMAKE_EXTRA_GENERATOR_C_SYSTEM_DEFINED_MACROS}" MATCHES "__clang__"
             OR "${CMAKE_C_COMPILER_ID}" MATCHES ${CLANG_COMPILER_ID_REGEX})
         set(CMAKE_COMPILER_IS_CLANG 1)
-endif()
+    endif()
 
-if("${CMAKE_CXX_COMPILER}" MATCHES "clang(\\+\\+)?$"
+    if("${CMAKE_CXX_COMPILER}" MATCHES "clang(\\+\\+)?$"
             OR "${CMAKE_EXTRA_GENERATOR_CXX_SYSTEM_DEFINED_MACROS}" MATCHES "__clang__"
             OR "${CMAKE_CXX_COMPILER_ID}" MATCHES ${CLANG_COMPILER_ID_REGEX})
         set(CMAKE_COMPILER_IS_CLANGXX 1)
+    endif()
 endif()
 
 macro(add_gcc_compiler_cxxflags FLAGS)
@@ -402,13 +408,17 @@ if (MSVC)
     if(MSVC_TOOLSET_VERSION LESS 141)
         message(FATAL_ERROR "Only Microsoft Visual Studio 17 and newer are supported!")
     endif()
-    add_compile_options(/permissive- /utf-8 /MP)
+    add_compile_options(/permissive- /utf-8)
+    # Clang-cl does not support /MP, /Zf, or /fsanitize=address
+    if (NOT CMAKE_COMPILER_IS_CLANG_MSVC)
+        add_compile_options(/MP)
         if(IS_DEBUG_BUILD)
             add_compile_options(/Zf)
             if(MSVC_TOOLSET_VERSION GREATER 141)
                 add_compile_definitions(/fsanitize=address)
             endif()
         endif()
+    endif()
 endif()
 
 if(WIN32)
@@ -422,7 +432,7 @@ if(WIN32)
             # By default MSVC enables NXCOMPAT
             add_compile_options(/guard:cf)
             add_link_options(/DYNAMICBASE /HIGHENTROPYVA /GUARD:CF)
-        else(MINGW)
+        else()
             set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--nxcompat -Wl,--dynamicbase")
             set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,--nxcompat -Wl,--dynamicbase")
             # Enable high entropy ASLR for 64-bit builds
@@ -432,6 +442,8 @@ if(WIN32)
             endif()
         endif()
     endif()
+    # Determine if we can link against the Windows SDK, used for Windows Hello support
+    find_library(WINSDK WindowsApp.lib)
 endif()
 
 if(APPLE AND WITH_APP_BUNDLE OR WIN32)

src/CMakeLists.txt

@@ -271,7 +271,7 @@ if(WIN32)
     list(APPEND gui_SOURCES
             gui/osutils/winutils/ScreenLockListenerWin.cpp
             gui/osutils/winutils/WinUtils.cpp)
-    if (MSVC)
+    if (WINSDK)
         list(APPEND gui_SOURCES quickunlock/WindowsHello.cpp)
     endif()
 endif()
@@ -415,7 +415,7 @@ if(UNIX AND NOT APPLE)
 endif()
 if(WIN32)
     target_link_libraries(keepassxc_gui Wtsapi32.lib Ws2_32.lib)
-    if (MSVC)
+    if (WINSDK)
         target_link_libraries(keepassxc_gui WindowsApp.lib)
     endif()
 endif()

src/core/Bootstrap.cpp

@@ -175,6 +175,7 @@ namespace Bootstrap
 
         if (!CreateWellKnownSid(WinCreatorOwnerRightsSid, nullptr, pOwnerRightsSid, &pOwnerRightsSidSize)) {
             auto error = GetLastError();
+            Q_UNUSED(error)
             goto Cleanup;
         }