[CMake] #include and fortran dependencies

[Arjen Markus]

Hello,

for whatever it is worth, C-style preprocessor commands
are a non-standard feature. The Fortran standard itself
defines only the "INCLUDE" statement (or directive).
Perhaps you can solve this in a standard way by moving the
logic to the CMakeLists.txt files rather than relying
on (possibly ubiquitous but still non-standard) support
of these C preprocessor commands.

Regards,

Arjen

On Tue, 28 Feb 2012 13:28:19 -0500
  Brad King <brad.king at kitware.com> wrote:
> On 2/28/2012 11:06 AM, Dirk vanMeeuwen wrote:
>> #include "fpp-Windows-definition.inc"
>> MODULE MSG
>> ...
>> END MODULE
>>
>> However, when this module MSG is used, the project build 
>>order
> > generated by CMake is not correct (see attached small 
>example).
> 
>Fortran dependencies are supported, and the Intel Fortran 
>12 compiler
> is expected to work with the NMake Makefiles generator.
> 
> I was able to reproduce the problem.  If I remove the 
>#if logic from
> the .inc file then it works.  I think this may be a bug 
>in the
> Source/cmDependsFortran* files of CMake.  It is not 
>handling the #if
> logic correctly and tricks itself into thinking that all 
>the code
> after the #include line is being preprocessed out as if 
>in "#if 0".
> That's why the order of the lines affects the results.
> 
> I don't have time to investigate this myself but if 
>anyone is
> interested then take a look at 
>Source/cmDependsFortranParser.y
> and Source/cmDependsFortran.cxx for use of the _RuleIf, 
>_RuleElse,
> and similar functions.
> 
> -Brad
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