misc-use-internal-linkage

Detects variables and functions that can be marked as static or moved into an anonymous namespace to enforce internal linkage.

Static functions and variables are scoped to a single file. Marking functions and variables as static helps to better remove dead code. In addition, it gives the compiler more information and allows for more aggressive optimizations.

Example:

int v1; // can be marked as static

void fn1() {} // can be marked as static

namespace {
  // already in anonymous namespace
  int v2;
  void fn2();
}
// already declared as extern
extern int v2;

void fn3(); // without function body in all declaration, maybe external linkage
void fn3();

// export declarations
export void fn4() {}
export namespace t { void fn5() {} }
export int v2;

Options

FixMode

Selects what kind of a fix the check should provide. The default is UseStatic.

None

Don’t fix automatically.

UseStatic

Add static for internal linkage variable and function.