From 7ce08eab6cd20d48d83167bfb48c272cabfe5c2b Mon Sep 17 00:00:00 2001 From: Corinna Vinschen Date: Fri, 12 Jun 2009 15:06:26 +0000 Subject: * localtime.cc (time2): Add workaround for spring gap problem. Add explaining comment. --- winsup/cygwin/ChangeLog | 5 +++++ winsup/cygwin/localtime.cc | 23 ++++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog index 01ffd362d..1723b188c 100644 --- a/winsup/cygwin/ChangeLog +++ b/winsup/cygwin/ChangeLog @@ -1,3 +1,8 @@ +2009-06-12 Corinna Vinschen + + * localtime.cc (time2): Add workaround for spring gap problem. Add + explaining comment. + 2009-06-12 Corinna Vinschen * Makefile.in (SUBLIBS): Add librt.a. diff --git a/winsup/cygwin/localtime.cc b/winsup/cygwin/localtime.cc index 6c05851bd..aa0f735ee 100644 --- a/winsup/cygwin/localtime.cc +++ b/winsup/cygwin/localtime.cc @@ -1989,7 +1989,28 @@ time2(struct tm *tmp, void (*funcp) P((const time_t*, long, struct tm*)), ** If that fails, try with normalization of seconds. */ t = time2sub(tmp, funcp, offset, okayp, false); - return *okayp ? t : time2sub(tmp, funcp, offset, okayp, true); + if (*okayp) + return t; + t = time2sub(tmp, funcp, offset, okayp, true); + if (*okayp) + return t; + /* Workaround for the spring gap problem which results in the + autoconf mktime usability test failing. + What we do here is this: The gap has 3600 seconds. If we + subtract 3600 from the tm_sec value and get a valid result, + then we can simply add 3600 to the return value and are done. + If the result is still not valid, the problem is not the + spring gap and we can give up. */ + struct tm tmp2 = *tmp; + tmp2.tm_sec -= 3600; + t = time2sub(&tmp2, funcp, offset, okayp, true); + if (*okayp) + { + if (t + 3600 < t) /* Sanity check */ + return WRONG; + return t + 3600; + } + return t; } static time_t -- cgit v1.2.3