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, 4 insertions, 4 deletions

diff --git a/lib.c b/lib.c
index 6fae0008..871c1131 100644
--- a/lib.c
+++ b/lib.c
@@ -12437,7 +12437,7 @@ static val make_time_impl(time_t (*pmktime)(struct tm *),
                           val hour, val minute, val second,
                           val isdst)
 {
-  struct tm local = { 0 };
+  struct tm local = all_zero_init;
   time_t time;
 
   time_fields_to_tm(&local, year, month, day,
@@ -12458,7 +12458,7 @@ val make_time(val year, val month, val day,
 
 static struct tm epoch_tm(void)
 {
-  struct tm ep = { 0 };
+  struct tm ep = all_zero_init;
   ep.tm_year = 70;
   ep.tm_mday = 1;
   return ep;
@@ -12560,7 +12560,7 @@ static val time_meth(val utc_p, val time_struct)
 
 static val time_string_meth(val time_struct, val format)
 {
-  struct tm tms = { 0 };
+  struct tm tms = all_zero_init;
   time_struct_to_tm(&tms, time_struct, t);
   char buffer[512] = "";
   char *fmt = utf8_dup_to(c_str(format));
@@ -12577,7 +12577,7 @@ static val time_string_meth(val time_struct, val format)
 
 static val time_parse_meth(val time_struct, val format, val string)
 {
-  struct tm tms = { 0 };
+  struct tm tms = all_zero_init;
   time_struct_to_tm(&tms, time_struct, nil);
   val ret = nil;