From: tkoenig@netcologne.de   
      
   Lynn McGuire  schrieb:   
      
   > I found and fixed the problem with my code along with one of my   
   > programmers.  I was not properly handling the size_t hidden argument   
   > length value that GFortran adds to the character string arguments in my   
   > C++ code.  Things are going better now.   
      
   Good to hear that.   
      
   Another thing that works well for gcc is to link everything with   
   the -flto option.   
      
   An example:   
      
   $ cat main.f90   
   program memain   
     character *1 c   
     call foo(c)   
     print *,c   
   end   
   $ cat foo.c   
   void foo_(char *c)   
   {   
     *c = 'A';   
   }   
   $ gfortran -flto  main.f90 foo.c   
   main.f90:3:13: warning: type of 'foo' does not match original declaration   
   [-Wlto-type-mismatch]   
       3 |   call foo(c)   
         |             ^   
   foo.c:1:6: note: type mismatch in parameter 2   
       1 | void foo_(char *c)   
         |      ^   
   foo.c:1:6: note: type 'void' should match type 'long int'   
   foo.c:1:6: note: 'foo_' was previously declared here   
      
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