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From: "slayoo at staszic dot waw.pl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/53077] New: suggestion to add the .f extension to the list of file extensions that trigger enabling of the preprocessor
Date: Sun, 22 Apr 2012 20:34:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53077

             Bug #: 53077
           Summary: suggestion to add the .f extension to the list of file
                    extensions that trigger enabling of the preprocessor
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: slayoo@staszic.waw.pl


Hello,


$ cat test.f
#define print(x) print*, x
program test
  print('aqq')
end
$ gfortran -ffree-form test.f
Warning: test.f:1: Illegal preprocessor directive
test.f:3.8:

  print('aqq')
        1
Error: Missing leading left parenthesis in format string at (1)
$ mv test.f test.F
$ gfortran-mp-4.6 -ffree-form test.F && echo OK
OK



This behavior is consistent with the docs but it's quite misleading, especially
as the warning message might be understood as if there was something wrong
within the macro definition, and not with the fact that the macro is there at
all.

Why not turning on the preprocessor with .f extensions as well? 
(currently only the .F extension turns it on by default)

HTH,
Sylwester