[LLVMbugs] [Bug 6884] New: Clang fails to account for no-return destructors in warnings

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Apr 20 19:05:55 PDT 2010


           Summary: Clang fails to account for no-return destructors in
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: chandlerc at gmail.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com

Below, the noretutrn 'abort' function correctly prevents any warnings about
returning from a non-void function, but a noreturn destructor on a temporary
object fails to do this. These structures can be used to stream out a fatal
message prior to calling abort, among other cases.

% cat t.cc
void abort() __attribute__((noreturn));

struct abort_struct {
  abort_struct() {}
  ~abort_struct() __attribute__((noreturn)) { abort(); }

int f(int x) {
  switch (x) { default: abort(); }

int g(int x) {
  switch (x) { default: abort_struct(); }

% ./bin/clang -fsyntax-only -Wall t.cc
t.cc:14:1: warning: control reaches end of non-void function [-Wreturn-type]
1 warning generated.

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