warning cleanup: GNU C++ initializer warnings.

This is the eight and final round of an effort to enable
GCC's -Wextra option. The C++ compiler, with -Wextra,
doesn't like C's universal struct initializer { 0 },
individually complaining about all the remaining members
not being initialized. What works in C++ is the { }
initializer. Conditional definition to the rescue.

* lib.h (all_zero_init): New macro which expands to
{ } under C++, and { 0 } under C.

* lib.c (make_time_impl, epoch_tm, time_string_meth,
time_parse_meth): Use all_zero_init.

* parser.c (prime_parser): Likewise.

* socket.c (sock_mark_connected): Likewise.

* sysif.c (fcntl_wrap): Likewise.

* termios.c (encode_speeds, decode_speeds): Likewise.

* configure (diag_flags): Add -Wextra.

1 files changed, 1 insertions, 1 deletions

diff --git a/parser.c b/parser.c
index c6699988..992e9719 100644
--- a/parser.c
+++ b/parser.c
@@ -206,7 +206,7 @@ val parser_set_lineno(val self, val stream, val lineno)
 
 void prime_parser(parser_t *p, val name, enum prime_parser prim)
 {
-  struct yy_token sec_tok = { 0 };
+  struct yy_token sec_tok = all_zero_init;
 
   switch (prim) {
   case prime_lisp: