http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51028
Bug #: 51028 Summary: [C++11] Alias-Declaration in namespace omits other whole code Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: kikair...@gmail.com testcase: // test.cc namespace { using int_x = int; } int main() { } $ g++ -std=c++11 test.cc /usr/lib/x86_64-linux-gnu/crt1.o: In function `_start': (.text+0x20): undefined reference to `main' collect2: error: ld returned 1 exit status $ g++ -std=c++11 test.cc -c (no message) $ nm test.o (no message)