[Scons-users] F90PPCOM vs F90COM not invoked correctly

[Luke Robison]

It looks like the manpage mentions this:

SCons handles the upper-case .F file suffix differently, depending on the
capabilities of the underlying system. On a case-sensitive system such as
Linux or UNIX, SCons treats a file with a .F suffix as a Fortran source
file that is to be first run through the standard C preprocessor. On a
case-insensitive system such as Windows, SCons treats a file with a .F suffix
as a Fortran source file that should *not* be run through the C
preprocessor.

Can anyone point me to the Scons module that makes that decision?  Windows
is somewhat case sensitive, so this seems like an unnecessary fallback when
all tools can recognize .f vs .F (indeed, Glob itself well fail to find .F
files if given "*.f").

Luke

On Wed, Apr 15, 2020 at 5:23 PM Luke Robison <lukerobison at gmail.com> wrote:

> I am running scons-3.1.2 under MSYS, and realizing it does not recognize
> .F90 files as requiring the F90PPCOM command.  Instead scons is running the
> F90COM command, which doesn't include the CPPDEFINES.
>
> On the other hand, gfortran is recognizing the .F90 vs .f90 extension and
> performing preprocessing as requested, it just doesn't have the correct
> $CPPFLAGS to work.
>
> Using scons 3.0.1 under WSL, the correct F90PPCOM is executed.  Is this a
> bug in the newer version of scons?  Additionally I think my scons-3.1.2 is
> run under python3, while my scons-3.0.1 is run under python-2.7 (but I'm
> not sure about that).
>
> ----
>
> env_clean = Environment()
> env_clean.Append(CPPDEFINES={'DEFINEDVAL':'1'})
> env_clean.Alias('test',env_clean.Program('test1.f90'))
> env_clean.Alias('testpp',env_clean.Program('test2.F90'))
>
> ----
>
> $ scons --debug=presub testpp
> scons: Reading SConscript files ...
> scons: done reading SConscript files.
> scons: Building targets ...
> Building test2.o with action:
>   *$F90COM*
> gfortran -o test2.o -c test2.F90
> test2.F90:3:2:
>
>     3 | #warning "this has been PreProcessed"
>       |  1~~~~~~
> Warning: #warning "this has been PreProcessed" [-Wcpp]
> test2.F90:6:20:
>
>     6 |     bar = DEFINEDVAL
>       |                    1
> Error: Symbol 'definedval' at (1) has no IMPLICIT type
> scons: *** [test2.o] Error 1
> scons: building terminated because of errors.
>
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