The GNU Fortran Compiler: Volatile COMMON blocks

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#### 6.2.5 Volatile `COMMON` blocks

Some Fortran compilers, including `g77`, let the user declare `COMMON` with the `VOLATILE` attribute. This is invalid standard Fortran syntax and is not supported by `gfortran`. Note that `gfortran` accepts `VOLATILE` variables in `COMMON` blocks since revision 4.3.