gcc/clang "static assertion failed" in CI

static_assert checks a compile-time condition and fails the build with its message when false. It is an intentional guard - a trait, size, or version requirement was not met.

What this error means

The build stops at a static_assert with its custom message, often from a library enforcing a type trait, integer width, or standard version.

gcc

traits.h:18:3: error: static assertion failed: T must be trivially copyable
   18 |   static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable");
      |   ^~~~~~~~~~~~~

Common causes

How to fix it

Satisfy the asserted condition

Read the static_assert message - it states the exact requirement.
Change the type or configuration so the predicate holds.

gcc

// assert wants trivially copyable: remove the custom destructor,
// or use a different storage type that satisfies the trait.

How to prevent it

Honor the documented constraints of the templates you instantiate; static_assert turns a violated requirement into a clear compile-time message.