cmake: fix clang compilation

CMakeLists.txt

@@ -30,6 +30,10 @@ else()
   message(STATUS "Configuring hyprgraphics in Release")
 endif()
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+  add_compile_definitions(__cpp_concepts=202002L)
+endif()
+
 file(GLOB_RECURSE SRCFILES CONFIGURE_DEPENDS "src/*.cpp" "include/*.hpp")
 file(GLOB_RECURSE PUBLIC_HEADERS CONFIGURE_DEPENDS "include/*.hpp")
 

src/image/formats/Bmp.cpp

@@ -64,6 +64,8 @@ class BmpHeader {
             return "Unable to parse bitmap header: wrong image size";
 
         file.seekg(dataOffset);
+
+        return std::nullopt;
     };
 };
 

src/image/formats/JpegXL.cpp

@@ -50,7 +50,7 @@ std::expected<cairo_surface_t*, std::string> JXL::createSurfaceFromJXL(const std
         .num_channels = 4,
         .data_type    = JXL_TYPE_UINT8,
         .endianness   = JXL_LITTLE_ENDIAN,
-        .align        = cairo_image_surface_get_stride(cairoSurface),
+        .align        = (size_t)cairo_image_surface_get_stride(cairoSurface),
     };
 
     const auto OUTPUTSIZE = basicInfo.xsize * basicInfo.ysize * format.num_channels;