[Scons-users] Problem with Fortran Dependency Scanner

[Nikolaus Rath]

Hi Damien,

If I add '.' to FORTRANPATH, the build succeeds and the com.mod file is
ends up in src2 (next to com.f90).

Are you sure that your method also works if the dependencies cross
different directories?

Best,
-Nikolaus

On 04/27/2015 09:59 AM, Damien wrote:
> Is the mod file actually being generated somewhere in the tree?
> 
> This is what we do to set up our Fortran command line on Linux:
> 
>     env['FORTRAN'] = 'gfortran'
>     env['FORTRANMODDIRPREFIX'] = '-J'
>     env['FORTRANMODDIR'] = '${TARGET.dir}'
>     env['FORTINCPREFIX'] = '-I'
>     env['_FORTRANINCFLAGS'] = '$( ${_concat(FORTINCPREFIX, FORTRANPATH, 
> INCSUFFIX, __env__, RDirs, TARGET, SOURCE)} $)'
>     env['FORTRANCOM'] = '$FORTRAN -o$TARGET -c $FORTRANFLAGS 
> $FORTRANMODDIRPREFIX$FORTRANMODDIR $_FORTRANINCFLAGS $SOURCES'
>     env['SHFORTRANCOM'] = env['FORTRANCOM']
>     env['SHF90PPCOM'] = env['FORTRANCOM']
>     env['SHF95PPCOM'] = env['FORTRANCOM']
>     env['F90PPCOM'] = env['FORTRANCOM']
>     env['F95PPCOM'] = env['FORTRANCOM']
> 
> We had a world of pain getting Fortran modules to work, and we did this 
> many years ago, with a similar blunt chainsaw on the Windows and OSX 
> builds, but it works.
> 
> Damien
> 
> 
> 
> On 2015-04-27 10:49 AM, Nikolaus Rath wrote:
>> Hi Damien,
>>
>> No luck:
>>
>> scons: Building targets ...
>> gfortran -o bar.o -c -g -Wall -O3 -DSETTING
>> -I/home/nikratio/tmp/scons-test/inc -J. bar.F
>> bar.F:2.9:
>>
>>        USE com
>>           1
>> Fatal Error: Can't open module file 'com.mod' for reading at (1): No
>> such file or directory
>> scons: *** [bar.o] Error 1
>>
>>
>> Best,
>> -Nikolaus
>>
>>
>> On 04/27/2015 08:10 AM, Damien wrote:
>>> Try adding this to your flags:
>>>
>>> env['FORTRANMODDIRPREFIX'] = '-J'
>>> env['FORTRANMODDIR'] = '${TARGET.dir}'
>>>
>>> Modules and directories can be a bit of a pain...
>>>
>>> Damien
>>>
>>> On 2015-04-27 8:50 AM, Nikolaus Rath wrote:
>>>> Hello,
>>>>
>>>> I have the following tiny test project:
>>>>
>>>> $ find -type f
>>>> ./src1/foo.f
>>>> ./src1/bar.F
>>>> ./src1/bar.mod
>>>> ./src1/SConstruct
>>>> ./src2/com.f90
>>>> ./inc/params.f
>>>>
>>>> $ cat src1/bar.F
>>>>         PROGRAM bar
>>>>         USE com
>>>>         IMPLICIT NONE
>>>>
>>>>         PRINT *, 'Starting bar'
>>>>         PRINT *, 'Value of SETTING is', SETTING
>>>>         call com_sub
>>>>         PRINT *, 'End of bar'
>>>>         END
>>>>
>>>> $ cat src2/com.f90
>>>> MODULE com
>>>>     USE foo
>>>>     INTEGER:: com_int=17
>>>> CONTAINS
>>>>     subroutine com_sub
>>>>       PRINT *, 'Starting com_sub'
>>>>       CALL foo_sub
>>>>       PRINT *, 'End of com_sub'
>>>>     end SUBROUTINE com_sub
>>>> END MODULE com
>>>>
>>>> $ cat src1/foo.f
>>>>         MODULE foo
>>>>         IMPLICIT NONE
>>>>         INCLUDE 'params.f'
>>>>         INTEGER foo_int
>>>>
>>>>         CONTAINS
>>>>
>>>>         subroutine foo_sub
>>>>         PRINT *, 'In foo_sub'
>>>>         end SUBROUTINE
>>>>         END MODULE foo
>>>>
>>>> $ cat inc/params.f
>>>>         real,parameter::zero=0,one=1
>>>>
>>>>
>>>> I'm trying to build it with the following Scons script:
>>>>
>>>> $ cat src1/SConstruct
>>>> # Attention, emacs, this is a -*- python -*- file.
>>>> import os
>>>>
>>>> opts = Variables(None, ARGUMENTS)
>>>> opts.Add(BoolVariable('DEBUG', 'Enable debugging', False))
>>>> opts.Add(BoolVariable('SETTING', 'Enable setting', True))
>>>>
>>>> env = DefaultEnvironment(variables = opts,
>>>>                            ENV = {'PATH' : os.environ['PATH']})
>>>>
>>>> # Use the same settings for all Fortran dialects
>>>> for dialect in ('F77', 'F90', 'F95', 'F03'):
>>>>       for var_suffix in ('', 'FLAGS', 'PATH'):
>>>>           env['%s%s' % (dialect, var_suffix)] = \
>>>>               '${FORTRAN%s}' % var_suffix
>>>>
>>>> opts = Split('-g -Wall')
>>>> if env['DEBUG']:
>>>>       opts += Split('-O0 -g')
>>>> else:
>>>>       opts += Split('-O3')
>>>> env.Append(FORTRANFLAGS=opts, CPPDEFINES=['SETTING'],
>>>>              FORTRANPATH=['#/../inc'])
>>>>
>>>> sources = [ 'bar.F',
>>>>               'foo.f',
>>>>               '../src2/com.f90' ]
>>>>
>>>> # Object method returns both .mod and .o, so we filter for the latter.
>>>> objects = [ x for x in Object(sources) if x.get_suffix() == '.o' ]
>>>> Program('test', objects)
>>>>
>>>>
>>>> However, this fails with:
>>>>
>>>> $ scons
>>>> scons: Reading SConscript files ...
>>>> scons: done reading SConscript files.
>>>> scons: Building targets ...
>>>> gfortran -o /home/nikratio/tmp/scons-test/src2/com.o -c -g -Wall -O3
>>>> -I/home/nikratio/tmp/scons-test/inc
>>>> /home/nikratio/tmp/scons-test/src2/com.f90
>>>> /home/nikratio/tmp/scons-test/src2/com.f90:2.6:
>>>>
>>>>     USE foo
>>>>         1
>>>> Fatal Error: Can't open module file 'foo.mod' for reading at (1): No
>>>> such file or directory
>>>> scons: *** [/home/nikratio/tmp/scons-test/src2/com.o] Error 1
>>>> scons: building terminated because of errors.
>>>>
>>>>
>>>> It seems that Scons did not notice that src2/com.f90 depends on src1/foo.f.
>>>>
>>>>
>>>> Why is that?
>>>>
>>>>
>>>> With experimenting, I found out that it helps if I add '.' to
>>>> FORTRANPATH - but that seems wrong, because I don't want to include any
>>>> files from src1/.
>>>>
>>>>
>>>> Best,
>>>> -Nikolaus
>>>>
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>>
> 
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-- 
Nikolaus Rath, Ph.D.
Senior Scientist
Tri Alpha Energy, Inc.
+1 949 830 2117 ext 211