The GNU Fortran Compiler: ISO_FORTRAN_ENV

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### 10.1 `ISO_FORTRAN_ENV`

Standard:

  Fortran 2003 and later, except when otherwise noted

The `ISO_FORTRAN_ENV` module provides the following scalar default-integer named constants:

`ATOMIC_INT_KIND`:

  Default-kind integer constant to be used as kind parameter when defining integer variables used in atomic operations. (Fortran 2008 or later.)

`ATOMIC_LOGICAL_KIND`:

  Default-kind integer constant to be used as kind parameter when defining logical variables used in atomic operations. (Fortran 2008 or later.)

`CHARACTER_KINDS`:

  Default-kind integer constant array of rank one containing the supported kind parameters of the `CHARACTER` type. (Fortran 2008 or later.)

`CHARACTER_STORAGE_SIZE`:

  Size in bits of the character storage unit.

`ERROR_UNIT`:

  Identifies the preconnected unit used for error reporting.

`FILE_STORAGE_SIZE`:

  Size in bits of the file-storage unit.

`INPUT_UNIT`:

  Identifies the preconnected unit identified by the asterisk (`*`) in `READ` statement.

`INT8`, `INT16`, `INT32`, `INT64`:

  Kind type parameters to specify an INTEGER type with a storage size of 16, 32, and 64 bits. It is negative if a target platform does not support the particular kind. (Fortran 2008 or later.)

`INTEGER_KINDS`:

  Default-kind integer constant array of rank one containing the supported kind parameters of the `INTEGER` type. (Fortran 2008 or later.)

`IOSTAT_END`:

  The value assigned to the variable passed to the `IOSTAT=` specifier of an input/output statement if an end-of-file condition occurred.

`IOSTAT_EOR`:

  The value assigned to the variable passed to the `IOSTAT=` specifier of an input/output statement if an end-of-record condition occurred.

`IOSTAT_INQUIRE_INTERNAL_UNIT`:

  Scalar default-integer constant, used by `INQUIRE` for the `IOSTAT=` specifier to denote an that a unit number identifies an internal unit. (Fortran 2008 or later.)

`NUMERIC_STORAGE_SIZE`:

  The size in bits of the numeric storage unit.

`LOGICAL_KINDS`:

  Default-kind integer constant array of rank one containing the supported kind parameters of the `LOGICAL` type. (Fortran 2008 or later.)

`OUTPUT_UNIT`:

  Identifies the preconnected unit identified by the asterisk (`*`) in `WRITE` statement.

`REAL32`, `REAL64`, `REAL128`:

  Kind type parameters to specify a REAL type with a storage size of 32, 64, and 128 bits. It is negative if a target platform does not support the particular kind. (Fortran 2008 or later.)

`REAL_KINDS`:

  Default-kind integer constant array of rank one containing the supported kind parameters of the `REAL` type. (Fortran 2008 or later.)

`STAT_LOCKED`:

  Scalar default-integer constant used as STAT= return value by `LOCK` to denote that the lock variable is locked by the executing image. (Fortran 2008 or later.)

`STAT_LOCKED_OTHER_IMAGE`:

  Scalar default-integer constant used as STAT= return value by `UNLOCK` to denote that the lock variable is locked by another image. (Fortran 2008 or later.)

`STAT_STOPPED_IMAGE`:

  Positive, scalar default-integer constant used as STAT= return value if the argument in the statement requires synchronisation with an image, which has initiated the termination of the execution. (Fortran 2008 or later.)

`STAT_FAILED_IMAGE`:

  Positive, scalar default-integer constant used as STAT= return value if the argument in the statement requires communication with an image, which has is in the failed state. (TS 18508 or later.)

`STAT_UNLOCKED`:

  Scalar default-integer constant used as STAT= return value by `UNLOCK` to denote that the lock variable is unlocked. (Fortran 2008 or later.)

The module provides the following derived type:

`LOCK_TYPE`:

  Derived type with private components to be use with the `LOCK` and `UNLOCK` statement. A variable of its type has to be always declared as coarray and may not appear in a variable-definition context. (Fortran 2008 or later.)

The module also provides the following intrinsic procedures: COMPILER_OPTIONS and COMPILER_VERSION.

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