Hi Arjen,

Since I just ran into exactly this problem myself (with mingw on 
windows)... Should we fix example x19f.f to work with f77? It is in the 
f77 examples folder so I think it is reasonable for the user to assume 
that it should be possible to compile this example with a f77 compiler.

best,
-Hazen

Arjen Markus wrote:
> Hi Werner,
> 
> the floor function does not exist in FORTRAN 77, so you need
> to implement it, for instance:
> 
> *234567
>        REAL FUNCTION FLOOR(X)
>        REAL X
>        FLOOR = FLOAT(INT(X))
>        RETURN
>        END
> 
> The declaration "character*(length) label" is a Fortran 90
> facility. Use:
> 
>        character*(*) label
> 
> This should actually be handled by the C interface (the
> string length is passed as a hidden argument ...) I do not
> have time the coming days to look into it closely, but I
> will try.
> 
> You can not pass a null pointer (0) in FORTRAN 77. To turn the
> labeller off, I am afraid you will have to use either a separate
> routine (call plslabelfuncoff) or use a dummy routine.
> 
> Regards,
> 
> Arjen
> 
> On 2009-09-15 13:47, Werner Smekal wrote:
>> Hi,
>>
>> when I compile the latest revision of PLplot with MinGW 3.4.5  
>> including the g77 compiler I get the following compiler error:
>>
>> Scanning dependencies of target x19f
>> [ 88%] Building Fortran object examples/f77/CMakeFiles/x19f.dir/ 
>> x19f.f.obj
>> E:\plbuild\examples\f77\x19f.f: In function `normalize_longitude':
>> E:\plbuild\examples\f77\x19f.f:80: warning:
>>              times = floor ((abs(lon) + 180.0d0) / 360.0d0)
>>                      ^
>> Reference to unimplemented intrinsic `FLOOR' at (^) (assumed EXTERNAL)
>> E:\plbuild\examples\f77\x19f.f:80:
>>              times = floor ((abs(lon) + 180.0d0) / 360.0d0)
>>                      ^
>> Invalid declaration of or reference to symbol `floor' at (^)  
>> [initially seen at (^)]
>> E:\plbuild\examples\f77\x19f.f: In subroutine `geolocation_labeler':
>> E:\plbuild\examples\f77\x19f.f:91:
>>           subroutine geolocation_labeler(axis, value, label, length)
>>                                                              1
>> E:\plbuild\examples\f77\x19f.f:95: (continued):
>>           character*(length) label
>>                      2
>> Invalid declaration of or reference to symbol `length' at (2)  
>> [initially seen at (1)]
>> E:\plbuild\examples\f77\x19f.f: In program `x19f':
>> E:\plbuild\examples\f77\x19f.f:161: warning:
>>           call plslabelfunc(geolocation_labeler)
>>                1
>> E:\plbuild\examples\f77\x19f.f:177: (continued):
>>           call plslabelfunc(0)
>>                2
>> Argument #1 of `plslabelfunc' is passed by reference at (2) but is a  
>> procedure at (1) [info -f g77 M GLOBALS]
>> mingw32-make[2]: *** [examples/f77/CMakeFiles/x19f.dir/x19f.f.obj]  
>> Error 1
>> mingw32-make[1]: *** [examples/f77/CMakeFiles/x19f.dir/all] Error 2
>> mingw32-make: *** [all] Error 2
>>
>> Maybe someone who is more knowledgeable about Fortran can help me out  
>> make this example work.
>>
>> Thanks,
>> Werner
>>
>> --
>> Dr. Werner Smekal
>> Institut fuer Allgemeine Physik
>> Technische Universitaet Wien
>> Wiedner Hauptstr 8-10
>> A-1040 Wien
>> Austria
>> DVR-Nr: 0005886
>>
>> email: sme...@iap.tuwien.ac.at
>> web:   http://www.iap.tuwien.ac.at/~smekal
>> phone: +43-(0)1-58801-13463 (office)
>>         +43-(0)1-58801-13469 (laboratory)
>> fax:   +43-(0)1-58801-13499
>>
>>
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