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20040815: building UDUNITS on Cygwin

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  • Subject: 20040815: building UDUNITS on Cygwin
  • Date: Mon, 16 Aug 2004 12:59:45 -0600
Dipesh,

>Date: Fri, 13 Aug 2004 14:41:47 -0700
>From: Dipesh Patel <address@hidden>
>Organization: USDA
>To: "'Steve Emmerson'" <address@hidden>
>Subject: RE: 20040813: building UDUNITS on Cygwin 
> Keywords: 200408131907.i7DJ7QaW021117 UDUNITS

The above message contained the following:

>       Sorry to keep bugging you...but I got the 1.12.1 version to compile.
> In the CUSTOMIZE file, when I defined the CPPFLAGS macro, I had set it to
> the following:
> 
> CPPFLAGS=-Df2cFortran -DNDEBUG
> 
> Well, it didn't like the space, so I just took off the -DNDEBUG flag and
> then it worked fine.
> 
>       But, I still have the off by 1 second error.  Here is the test
> program I'm using:
> 
> #include <iostream>
> 
> #if defined(__cplusplus)
> extern "C"
> {
> #include "udunits.h"
> }
> #endif
> 
> using namespace std;
> 
> int main(int argc, char *argv[])
> {
>     int year = 2003;
>     int month = 5;
>     int day = 30;
>     int hour = 10;
>     int min = 35;
>     float sec = 20;
>     string timeUnitStr = "minutes since 1800-01-01 00:00:00";
>     double timeStamp;
>     utUnit timeUnit;
>     
>     // Initialize udunits package
>     utInit("");
>     
>     utScan(timeUnitStr.c_str(), &timeUnit);
> 
>     cout << "BEFORE: " << endl;
>     cout << "Year : " << year << endl;
>     cout << "Month: " << month << endl;
>     cout << "Day  : " << day << endl;
>     cout << "Hour : " << hour << endl;
>     cout << "Min  : " << min << endl;
>     cout << "Sec  : " << sec << endl;
> 
>     utInvCalendar(year, month, day, hour, min, sec,
>                   &timeUnit, &timeStamp);
> 
>     utCalendar(timeStamp, &timeUnit, &year, &month, &day, &hour, &min,
> &sec);   
> 
>     cout << "AFTER: " << endl;
>     cout << "Year : " << year << endl;
>     cout << "Month: " << month << endl;
>     cout << "Day  : " << day << endl;
>     cout << "Hour : " << hour << endl;
>     cout << "Min  : " << min << endl;
>     cout << "Sec  : " << sec << endl;
>     
>     return 0 ;
> }
> 
> I get the following output when I run this program.  Notice that "sec"
> before I run utInvCalendar and utCalendar is "20", but after I lose a second
> and it becomes "19".  Any idea of why this might be happening on Cywin?
> 
> BEFORE:
> Year : 2003
> Month: 5
> Day  : 30
> Hour : 10
> Min  : 35
> Sec  : 20
> AFTER:
> Year : 2003
> Month: 5
> Day  : 30
> Hour : 10
> Min  : 35
> Sec  : 19

If you increase the precision with wich the "sec" variable is printed,
does the difference decrease?

Regards,
Steve Emmerson