compilation - This FORTRAN code shouldn't compile. Is there a reason why it does? -

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the following code compiles, not think should. can see, output garbage.

this minimal failing example of bit me hard in large project work on.

my question - why compiler not complain? compiler limitation, or somehow "expected behaviour", , i've missed something?

i'm using gfortran 4.6.3.

module datamodule     integer :: datum1 = int(1)     integer :: datum2 = int(2)     end module datamodule  program moduletest     use datamodule, only: datum1      write(*,*) "datum 1 is", datum1     write(*,*) "datum 2 is", datum2  end program moduletest

example output:

datum 1           1 datum 2  4.58322689e-41

your code @ fault, not compiler. if datum2 use associated despite only clause , if explicit initialization of datum2 ignored, yes, naughty compiler.

the answer more mundane, though.

datum2 not use associated: in absence of implicit none implicitly typed variable in main program. "garbage" comes fact not defined, initialization or assignment, before value referenced , it's implicitly (default) real. compiler isn't required detect mistake @ compile (or run) time.


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