Lahey/GNU Fortran

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9.1 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_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.