https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66921
Bug ID: 66921 Summary: failure to determine size of static constexpr array that is nested within a templated class Product: gcc Version: 4.9.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: vlad at petric dot cc Target Milestone: --- Created attachment 36010 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36010&action=edit straightforward file (include-less) that fails to compile template<typename T> struct Holder { constexpr static const int array[] = { 1, 2, 3 }; enum {F = array[0]}; }; class HI: public Holder<int> {}; gcc 4.9.3/Centos linux. $ g++ -std=c++11 ./x.cc -o x.o -c ./x.cc: In instantiation of ‘constexpr const int Holder<int>::array []’: ./x.cc:4:18: required from ‘struct Holder<int>’ ./x.cc:7:18: required from here ./x.cc:3:30: error: initializer fails to determine size of ‘Holder<int>::array’ constexpr static const int array[] = { 1, 2, 3 }; ^ ./x.cc:3:30: error: array must be initialized with a brace-enclosed initializer ./x.cc: In instantiation of ‘struct Holder<int>’: ./x.cc:7:18: required from here ./x.cc:4:8: error: enumerator value for ‘F’ is not an integer constant enum {F = array[0]}; * with gcc 4.8.3, it compiles just fine. * if I remove the template, it also compiles just fine: struct Holder { constexpr static const int array[] = { 1, 2, 3 }; enum {F = array[0]}; }; class HI: public Holder {};