[Plplot-devel] Example 29 troubles

[Werner S. <sm...@ia...>]

Hi,

on MinGW/Win32 (3.4.5 and 4.3.2) example 29 crashes:

Program received signal SIGSEGV, Segmentation fault.
0x10018c7c in pldtfac (vmin=-315.36000000000001, 
vmax=31536315.359999999, factor=0x23fbb0, start=0x23fba8)
     at Z:\DevZone\PLdev\plplot\src\pldtik.c:123
123         tm = *gmtime(&t);
(gdb) print t
$1 = -315
(gdb) print gmtime(&t)
$2 = 0
(gdb)

gmtime() is called with a negative value, 0 is returned, and if that is 
dereferenced than it crashes. I found two postings in the internet:

http://markmail.org/message/55gg5qz6c26a4edd
http://www.nntp.perl.org/group/perl.perl5.porters/2008/07/msg138464.html

which basically say, that gmtime in MinGW doesn't except negative values 
and Visual C++ allows them only from the 2008 version on (which I happen 
to have installed, that's why it worked for me with Visual C++).

I know that this time stuff is not finished yet, but still we should do 
something about that, e.g. checking the return value of gmtime not to be 
zero.

Any comments?

Werner

-- 
Dr. Werner Smekal
Institut fuer Allgemeine Physik
Technische Universitaet Wien
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A-1040 Wien
Austria

email: sm...@ia...
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