https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67026
Bug ID: 67026 Summary: GCC incorrectly rejects well-formed constexpr function definition Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: anders.granlund.0 at gmail dot com Target Milestone: --- Consider the following program (proc.cc): void g() {} constexpr void f() { return; g(); } int main() {} Compile it with the following command line: g++ prog.cc -std=c++14 -pedantic-errors The following error message is given: prog.cc: In function 'constexpr void f()': prog.cc:2:31: error: call to non-constexpr function 'void g()' constexpr void f() { return; g(); } ^ I expected to get no error message since the program is well-formed. I have tried this with gcc HEAD 6.0.0 20150726 here: http://melpon.org/wandbox/permlink/Hd5t7ppNQWFqioUx For comparison clang accepts the program with no error messages.