[llvm-bugs] [Bug 40323] New: incorrect static object initialization on Windows

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jan 15 11:01:05 PST 2019


            Bug ID: 40323
           Summary: incorrect static object initialization on Windows
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mib.bugzilla at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

This test case passes on Linux but fails on Windows, with -O0. When compiled
with the Microsoft compiler, the test case passes.
Output: Fail hist is 0 4
$ cat bug.cpp
#include <stdio.h>
long hist_ = 0;
template <class T>
struct X_ {
  static T i;
  static T init() { hist_ |= sizeof(T); return T(); }
template <class T> T X_<T>::i = X_<T>::init();
template struct X_<int>;

int main(int argc, char *argv[])
  X_<int> my_var2;
  if (hist_ != sizeof(int)) {
    printf("Fail hist is %d %d\n", hist_, sizeof(int));
    // On Windows, this exit is taken
    return 4;
  } else
    printf("Pass hist is %d %d\n", hist_, sizeof(int));
  return 0;

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