https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88175
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonny Grant from comment #4) > Also, it is "copy" that is unused uninitialized? (not "temp") Yes, in the test(info_t) function, which is what GCC says: header.h: In function ‘void test(info_t)’: header.h:8:16: error: ‘copy.info::registered’ is used uninitialized in this function But not in main(). There it's temp that's uninitialized, as GCC says: header.h: In function ‘int main()’: header.h:8:16: error: ‘temp.info::registered’ is used uninitialized in this function
