Enhance C++20 views support by refining preprocessor directives

- Updated `config.h` and `cxx_compiler_quirks.h` to conditionally define `SQLITE_ORM_CPP20_VIEWS_SUPPORTED` based on the presence of `SQLITE_ORM_BROKEN_CPP20_VIEWS` for better compatibility with Clang versions.
- Ensured that the definition of `SQLITE_ORM_CPP20_VIEWS_SUPPORTED` is only active when the necessary conditions are met, improving overall code robustness.

Author: fnc12

dev/functional/config.h

@@ -55,7 +55,7 @@
 #define SQLITE_ORM_CPP20_RANGES_SUPPORTED
 #endif
 
-#if __cpp_lib_ranges >= 202110L
+#if __cpp_lib_ranges >= 202110L && !defined(SQLITE_ORM_BROKEN_CPP20_VIEWS)
 #define SQLITE_ORM_CPP20_VIEWS_SUPPORTED
 #endif
 

dev/functional/cxx_compiler_quirks.h

@@ -73,6 +73,6 @@
 #define SQLITE_ORM_BROKEN_NONTEMPLATE_CONCEPTS
 #endif
 
-#if defined(SQLITE_ORM_CPP20_VIEWS_SUPPORTED) && (defined(__clang__) && (__clang_major__ <= 15))
-#undef SQLITE_ORM_CPP20_VIEWS_SUPPORTED
+#if defined(__clang__) && (__clang_major__ <= 15)
+#define SQLITE_ORM_BROKEN_CPP20_VIEWS
 #endif

include/sqlite_orm/sqlite_orm.h

@@ -221,8 +221,8 @@ using std::nullptr_t;
 #define SQLITE_ORM_BROKEN_NONTEMPLATE_CONCEPTS
 #endif
 
-#if defined(SQLITE_ORM_CPP20_VIEWS_SUPPORTED) && (defined(__clang__) && (__clang_major__ <= 15))
-#undef SQLITE_ORM_CPP20_VIEWS_SUPPORTED
+#if defined(__clang__) && (__clang_major__ <= 15)
+#define SQLITE_ORM_BROKEN_CPP20_VIEWS
 #endif
 
 // #include "platform_definitions.h"
@@ -317,7 +317,7 @@ using std::nullptr_t;
 #define SQLITE_ORM_CPP20_RANGES_SUPPORTED
 #endif
 
-#if __cpp_lib_ranges >= 202110L
+#if __cpp_lib_ranges >= 202110L && !defined(SQLITE_ORM_BROKEN_CPP20_VIEWS)
 #define SQLITE_ORM_CPP20_VIEWS_SUPPORTED
 #endif