On 01/04/15 15:16 +0100, Ian Malone wrote:
Do you mind clarifying? I thought <string> should provide that http://www.cplusplus.com/reference/string/string/operator+/ or is that what fno-implicit-templates is turning off?
Of course string provides it, but it's a template, so it needs to be instantiated. The GCC manual documents -fno-implicit-templates like so: Never emit code for non-inline templates that are instantiated implicitly (i.e. by use); only emit code for explicit instantiations. The invalid program in the OP uses operator+(), which would normally instantiate the function template implicitly. But if you use -fno-implicit-templates you are promising the compiler you will provide explicit instantiations. The program above does not provide them, so it is broken. "If you lie to the compiler, it will get its revenge." -- Henry Spencer -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
