https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109482
--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #5) > Not when s_addr is a macro for S_un.S_addr or something like that. The real definition on Solaris is more like: struct in_addr { union { struct { char b[4]; }; in_addr_t S_addr; } S_un; #define s_addr S_un.S_addr }; And this gives: error: expected primary-expression before '.' token in_addr a = {.s_addr = {}}; ^