diff options
Diffstat (limited to 'gcc/cppmacro.c')
| -rw-r--r-- | gcc/cppmacro.c | 42 |
1 files changed, 31 insertions, 11 deletions
diff --git a/gcc/cppmacro.c b/gcc/cppmacro.c index 50cc9bb..f0986b3 100644 --- a/gcc/cppmacro.c +++ b/gcc/cppmacro.c @@ -207,17 +207,37 @@ _cpp_builtin_macro_text (pfile, node) storage. We only do this once, and don't generate them at init time, because time() and localtime() are very slow on some systems. */ - time_t tt = time (NULL); - struct tm *tb = localtime (&tt); - - pfile->date = _cpp_unaligned_alloc (pfile, - sizeof ("\"Oct 11 1347\"")); - sprintf ((char *) pfile->date, "\"%s %2d %4d\"", - monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); - - pfile->time = _cpp_unaligned_alloc (pfile, sizeof ("\"12:34:56\"")); - sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", - tb->tm_hour, tb->tm_min, tb->tm_sec); + time_t tt; + struct tm *tb = NULL; + + /* (time_t) -1 is a legitimate value for "number of seconds + since the Epoch", so we have to do a little dance to + distinguish that from a genuine error. */ + errno = 0; + tt = time(NULL); + if (tt != (time_t)-1 || errno == 0) + tb = localtime (&tt); + + if (tb) + { + pfile->date = _cpp_unaligned_alloc (pfile, + sizeof ("\"Oct 11 1347\"")); + sprintf ((char *) pfile->date, "\"%s %2d %4d\"", + monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); + + pfile->time = _cpp_unaligned_alloc (pfile, + sizeof ("\"12:34:56\"")); + sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", + tb->tm_hour, tb->tm_min, tb->tm_sec); + } + else + { + cpp_errno (pfile, DL_WARNING, + "could not determine date and time"); + + pfile->date = U"\"??? ?? ????\""; + pfile->time = U"\"??:??:??\""; + } } if (node->value.builtin == BT_DATE) |