bug#19874: 25.0.50; encode-time not working as expected

[Wolfgang Jenkner <wjenkner@inode.at>]

On Thu, Feb 26 2015, Paul Eggert wrote:

> Ashish SHUKLA wrote:
>> When I looked into this before filing this bug report, from what I noticed
>> that it's not using libc's `mktime' function, unlike what you seem to
>> indicate. I'm not sure quite why it's doing that when libc provided mktime
>> works just fine
>
> It may work for this example, but 'configure' checks for a number of
> mktime bugs, and perhaps mktime is not working for some other
> examples.

Indeed, on amd64 time_t is a signed 64 bit type but something doesn't
really support that.  Adjusting time_t_max (and time_t_min) as if time_t
were a 32 bit type makes the mktime test pass, so that seems to be
a FreeBSD bug.

diff --git a/m4/mktime.m4 b/m4/mktime.m4
index 3f0e1ee..af60ef8 100644
--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -181,7 +181,7 @@ main ()
 
   time_t_max = (! time_t_signed
                 ? (time_t) -1
-                : ((((time_t) 1 << (sizeof (time_t) * CHAR_BIT - 2)) - 1)
+                : ((((time_t) 1 << (4 * CHAR_BIT - 2)) - 1)
                    * 2 + 1));
   time_t_min = (! time_t_signed
                 ? (time_t) 0



> Is 'configure' setting APPLE_UNIVERSAL_BUILD to 1, or to 0?  You can
> tell by looking for APPLE_UNIVERSAL_BUILD in lib/Makefile.

What has this to do with FreeBSD?

> When 'configure' says 'checking for working mktime', what's the result?

The test fails with exit status 3 (without the work-around above).

Wolfgang