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From: "karolmdv at gazeta dot pl" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/54258] New: Wrong size of a named union. Date: Tue, 14 Aug 2012 16:25:00 -0000 [thread overview] Message-ID: <bug-54258-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54258 Bug #: 54258 Summary: Wrong size of a named union. Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: major Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: karolmdv@gazeta.pl Created attachment 28014 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28014 Compiler's output. I tried to find it in the current list of open bugs and have seen many similar union-specific ones. The problem was detected when using std::aligned_storage, when noticed that sizeof(std::aligned_storage<x>) yields 1 for any "x". The following code demonstrates the problem. ---------------------------------------------------------------- int main() { // If "type" is removed (making the union anonymous), // it works and returns 18. struct my_aligned_storage { union type { unsigned char __data[18]; }; }; return sizeof(my_aligned_storage); // Returns 1. } ---------------------------------------------------------------- It has been compiled with (GCC 4.7.0): g++ -v -save-temps -o bug.exe -std=gnu++11 bug.cpp Full compiler's output is in the attachment.
next reply other threads:[~2012-08-14 16:25 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-08-14 16:25 karolmdv at gazeta dot pl [this message] 2012-08-14 16:38 ` [Bug c++/54258] " redi at gcc dot gnu.org
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