Merge pull request #31 from iris-cpp/suppress-pack-indexing-warning

Suppress warnings for using pack indexing in C++23

Author: saki7

CMakeLists.txt

@@ -133,7 +133,12 @@ if(MSVC)
     )
 else()
     if(CMAKE_CXX_COMPILER_ID MATCHES Clang)
-        target_compile_options(_iris_cxx_common INTERFACE -fno-builtin-std-forward_like)
+        target_compile_options(
+            _iris_cxx_common
+            INTERFACE
+                -fno-builtin-std-forward_like
+                -Wno-c++26-extensions # workaround for warnings emitted when using pack indexing
+        )
     endif()
     target_compile_options(
         _iris_cxx_common

include/iris/type_traits.hpp

@@ -57,10 +57,6 @@ template<std::size_t I, class T>
 using at_c_t = at_c<I, T>::type;
 
 #if __cpp_pack_indexing >= 202311L // has native pack indexing
-# if defined(__clang__)
-#  pragma clang diagnostic push
-#  pragma clang diagnostic ignored "-Wc++26-extensions"
-# endif
 
 # define IRIS_CORE_PACK_INDEXING(I, Ts_ellipsis) Ts_ellipsis[I]
 
@@ -74,9 +70,7 @@ struct at_c<I, TT<Ts...>>
 {
     using type = Ts...[I];
 };
-# if defined(__clang__)
-#  pragma clang diagnostic pop
-# endif
+
 // ----------------------------------------------------------
 #else // no native pack indexing
 template<std::size_t I, class... Ts>