https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105876
--- Comment #5 from Kevin Hendricks <kevin.b.hendricks at icloud dot com> --- It was declared in sg_constants.h as: extern const std::string MAIN_EXTERN_CONST_STRING; But why was its global nature lost: Based on nm output: ./no_lto_test:0000000000001210 t _GLOBAL__sub_I__Z24MAIN_EXTERN_CONST_STRINGB5cxx11 ./no_lto_test:00000000000041e0 B _Z24MAIN_EXTERN_CONST_STRINGB5cxx11 ./no_lto_test:0000000000004220 b _ZL24TEST_STATIC_CONST_STRING --- ./lto_test:0000000000004100 b _Z24MAIN_EXTERN_CONST_STRINGB5cxx11 ./lto_test:00000000000040e0 b _ZL24TEST_STATIC_CONST_STRING and there is no global initialization routine anymore at all So you are saying this is because a std::string constructor can not be considered const even though it is a object that can be fully constructed and allocated in pieces as a fixed structure datatype. So my solution is everywhere we use extern const std::string, I either have to change it to an untyped define/macro and give up type safety or change it to be a: extern const char * just so that it gets initialized as a proper global variable? That really makes std::string a second class citizen.
