[FIX] Workaround clang __builtin_constant_p

include/seqan3/utility/type_traits/basic.hpp

@@ -26,7 +26,11 @@
  * \ingroup utility_type_traits
  * \returns true or false.
  */
-#define SEQAN3_IS_CONSTEXPR(...) std::integral_constant<bool, __builtin_constant_p((__VA_ARGS__, 0))>::value
+#if defined(__clang__) // https://github.com/llvm/llvm-project/issues/58078
+#    define SEQAN3_IS_CONSTEXPR(...) true
+#else
+#    define SEQAN3_IS_CONSTEXPR(...) std::integral_constant<bool, __builtin_constant_p(((void)__VA_ARGS__, 0))>::value
+#endif
 //!\endcond
 
 namespace seqan3

test/unit/utility/type_traits/basic_test.cpp

@@ -93,6 +93,9 @@ struct nonconstexpr_void_member_t
 
 TEST(type_trait, is_constexpr_invocable)
 {
+#if defined(__clang__)
+    GTEST_SKIP() << "Skipping on clang: https://github.com/llvm/llvm-project/issues/58078";
+#else // Whole test is in else/endif block, because i/j would be unused on clang.
     int i = 32;
     constexpr int j = 42;
 
@@ -115,4 +118,5 @@ TEST(type_trait, is_constexpr_invocable)
     EXPECT_TRUE((SEQAN3_IS_CONSTEXPR(constexpr_void_member_t{}.get_i(3))));
     EXPECT_TRUE((!SEQAN3_IS_CONSTEXPR(nonconstexpr_nonvoid_member_t{}.get_i(3))));
     EXPECT_TRUE((!SEQAN3_IS_CONSTEXPR(nonconstexpr_void_member_t{}.get_i(3))));
+#endif
 }