Spec-Zone.ru › GNU Fortran 11

The GNU Fortran Compiler

Short Table of Contents

  • 1 Introduction
  • 2 GNU Fortran Command Options
  • 3 Runtime: Influencing runtime behavior with environment variables
  • 4 Fortran standards status
  • 5 Compiler Characteristics
  • 6 Extensions
  • 7 Mixed-Language Programming
  • 8 Coarray Programming
  • 9 Intrinsic Procedures
  • 10 Intrinsic Modules
  • Contributing
  • GNU General Public License
  • GNU Free Documentation License
  • Funding Free Software
  • Option Index
  • Keyword Index

Table of Contents

  • 1 Introduction
    • 1.1 About GNU Fortran
    • 1.2 GNU Fortran and GCC
    • 1.3 Preprocessing and conditional compilation
    • 1.4 GNU Fortran and G77
    • 1.5 Project Status
    • 1.6 Standards
      • 1.6.1 Varying Length Character Strings
  • 2 GNU Fortran Command Options
    • 2.1 Option summary
    • 2.2 Options controlling Fortran dialect
    • 2.3 Enable and customize preprocessing
    • 2.4 Options to request or suppress errors and warnings
    • 2.5 Options for debugging your program or GNU Fortran
    • 2.6 Options for directory search
    • 2.7 Influencing the linking step
    • 2.8 Influencing runtime behavior
    • 2.9 Options for code generation conventions
    • 2.10 Options for interoperability with other languages
    • 2.11 Environment variables affecting gfortran
  • 3 Runtime: Influencing runtime behavior with environment variables
    • 3.1 TMPDIR—Directory for scratch files
    • 3.2 GFORTRAN_STDIN_UNIT—Unit number for standard input
    • 3.3 GFORTRAN_STDOUT_UNIT—Unit number for standard output
    • 3.4 GFORTRAN_STDERR_UNIT—Unit number for standard error
    • 3.5 GFORTRAN_UNBUFFERED_ALL—Do not buffer I/O on all units
    • 3.6 GFORTRAN_UNBUFFERED_PRECONNECTED—Do not buffer I/O on preconnected units
    • 3.7 GFORTRAN_SHOW_LOCUS—Show location for runtime errors
    • 3.8 GFORTRAN_OPTIONAL_PLUS—Print leading + where permitted
    • 3.9 GFORTRAN_LIST_SEPARATOR—Separator for list output
    • 3.10 GFORTRAN_CONVERT_UNIT—Set endianness for unformatted I/O
    • 3.11 GFORTRAN_ERROR_BACKTRACE—Show backtrace on run-time errors
    • 3.12 GFORTRAN_FORMATTED_BUFFER_SIZE—Set buffer size for formatted I/O
    • 3.13 GFORTRAN_UNFORMATTED_BUFFER_SIZE—Set buffer size for unformatted I/O
  • 4 Fortran standards status
    • 4.1 Fortran 2003 status
    • 4.2 Fortran 2008 status
    • 4.3 Status of Fortran 2018 support
      • 4.3.1 TS 29113 Status (Further Interoperability with C)
      • 4.3.2 TS 18508 Status (Additional Parallel Features)
  • 5 Compiler Characteristics
    • 5.1 KIND Type Parameters
    • 5.2 Internal representation of LOGICAL variables
    • 5.3 Evaluation of logical expressions
    • 5.4 MAX and MIN intrinsics with REAL NaN arguments
    • 5.5 Thread-safety of the runtime library
    • 5.6 Data consistency and durability
    • 5.7 Files opened without an explicit ACTION= specifier
    • 5.8 File operations on symbolic links
    • 5.9 File format of unformatted sequential files
    • 5.10 Asynchronous I/O
  • 6 Extensions
    • 6.1 Extensions implemented in GNU Fortran
      • 6.1.1 Old-style kind specifications
      • 6.1.2 Old-style variable initialization
      • 6.1.3 Extensions to namelist
      • 6.1.4 X format descriptor without count field
      • 6.1.5 Commas in FORMAT specifications
      • 6.1.6 Missing period in FORMAT specifications
      • 6.1.7 Default widths for F, G and I format descriptors
      • 6.1.8 I/O item lists
      • 6.1.9 Q exponent-letter
      • 6.1.10 BOZ literal constants
      • 6.1.11 Real array indices
      • 6.1.12 Unary operators
      • 6.1.13 Implicitly convert LOGICAL and INTEGER values
      • 6.1.14 Hollerith constants support
      • 6.1.15 Character conversion
      • 6.1.16 Cray pointers
      • 6.1.17 CONVERT specifier
      • 6.1.18 OpenMP
      • 6.1.19 OpenACC
      • 6.1.20 Argument list functions %VAL, %REF and %LOC
      • 6.1.21 Read/Write after EOF marker
      • 6.1.22 STRUCTURE and RECORD
      • 6.1.23 UNION and MAP
      • 6.1.24 Type variants for integer intrinsics
      • 6.1.25 AUTOMATIC and STATIC attributes
      • 6.1.26 Extended math intrinsics
      • 6.1.27 Form feed as whitespace
      • 6.1.28 TYPE as an alias for PRINT
      • 6.1.29 %LOC as an rvalue
      • 6.1.30 .XOR. operator
      • 6.1.31 Bitwise logical operators
      • 6.1.32 Extended I/O specifiers
      • 6.1.33 Legacy PARAMETER statements
      • 6.1.34 Default exponents
    • 6.2 Extensions not implemented in GNU Fortran
      • 6.2.1 ENCODE and DECODE statements
      • 6.2.2 Variable FORMAT expressions
      • 6.2.3 Alternate complex function syntax
      • 6.2.4 Volatile COMMON blocks
      • 6.2.5 OPEN( ... NAME=)
      • 6.2.6 Q edit descriptor
  • 7 Mixed-Language Programming
    • 7.1 Interoperability with C
      • 7.1.1 Intrinsic Types
      • 7.1.2 Derived Types and struct
      • 7.1.3 Interoperable Global Variables
      • 7.1.4 Interoperable Subroutines and Functions
      • 7.1.5 Working with Pointers
      • 7.1.6 Further Interoperability of Fortran with C
    • 7.2 GNU Fortran Compiler Directives
      • 7.2.1 ATTRIBUTES directive
      • 7.2.2 UNROLL directive
      • 7.2.3 BUILTIN directive
      • 7.2.4 IVDEP directive
      • 7.2.5 VECTOR directive
      • 7.2.6 NOVECTOR directive
    • 7.3 Non-Fortran Main Program
      • 7.3.1 _gfortran_set_args — Save command-line arguments
      • 7.3.2 _gfortran_set_options — Set library option flags
      • 7.3.3 _gfortran_set_convert — Set endian conversion
      • 7.3.4 _gfortran_set_record_marker — Set length of record markers
      • 7.3.5 _gfortran_set_fpe — Enable floating point exception traps
      • 7.3.6 _gfortran_set_max_subrecord_length — Set subrecord length
    • 7.4 Naming and argument-passing conventions
      • 7.4.1 Naming conventions
      • 7.4.2 Argument passing conventions
  • 8 Coarray Programming
    • 8.1 Type and enum ABI Documentation
      • 8.1.1 caf_token_t
      • 8.1.2 caf_register_t
      • 8.1.3 caf_deregister_t
      • 8.1.4 caf_reference_t
      • 8.1.5 caf_team_t
    • 8.2 Function ABI Documentation
      • 8.2.1 _gfortran_caf_init — Initialiation function
      • 8.2.2 _gfortran_caf_finish — Finalization function
      • 8.2.3 _gfortran_caf_this_image — Querying the image number
      • 8.2.4 _gfortran_caf_num_images — Querying the maximal number of images
      • 8.2.5 _gfortran_caf_image_status — Query the status of an image
      • 8.2.6 _gfortran_caf_failed_images — Get an array of the indexes of the failed images
      • 8.2.7 _gfortran_caf_stopped_images — Get an array of the indexes of the stopped images
      • 8.2.8 _gfortran_caf_register — Registering coarrays
      • 8.2.9 _gfortran_caf_deregister — Deregistering coarrays
      • 8.2.10 _gfortran_caf_is_present — Query whether an allocatable or pointer component in a derived type coarray is allocated
      • 8.2.11 _gfortran_caf_send — Sending data from a local image to a remote image
      • 8.2.12 _gfortran_caf_get — Getting data from a remote image
      • 8.2.13 _gfortran_caf_sendget — Sending data between remote images
      • 8.2.14 _gfortran_caf_send_by_ref — Sending data from a local image to a remote image with enhanced referencing options
      • 8.2.15 _gfortran_caf_get_by_ref — Getting data from a remote image using enhanced references
      • 8.2.16 _gfortran_caf_sendget_by_ref — Sending data between remote images using enhanced references on both sides
      • 8.2.17 _gfortran_caf_lock — Locking a lock variable
      • 8.2.18 _gfortran_caf_lock — Unlocking a lock variable
      • 8.2.19 _gfortran_caf_event_post — Post an event
      • 8.2.20 _gfortran_caf_event_wait — Wait that an event occurred
      • 8.2.21 _gfortran_caf_event_query — Query event count
      • 8.2.22 _gfortran_caf_sync_all — All-image barrier
      • 8.2.23 _gfortran_caf_sync_images — Barrier for selected images
      • 8.2.24 _gfortran_caf_sync_memory — Wait for completion of segment-memory operations
      • 8.2.25 _gfortran_caf_error_stop — Error termination with exit code
      • 8.2.26 _gfortran_caf_error_stop_str — Error termination with string
      • 8.2.27 _gfortran_caf_fail_image — Mark the image failed and end its execution
      • 8.2.28 _gfortran_caf_atomic_define — Atomic variable assignment
      • 8.2.29 _gfortran_caf_atomic_ref — Atomic variable reference
      • 8.2.30 _gfortran_caf_atomic_cas — Atomic compare and swap
      • 8.2.31 _gfortran_caf_atomic_op — Atomic operation
      • 8.2.32 _gfortran_caf_co_broadcast — Sending data to all images
      • 8.2.33 _gfortran_caf_co_max — Collective maximum reduction
      • 8.2.34 _gfortran_caf_co_min — Collective minimum reduction
      • 8.2.35 _gfortran_caf_co_sum — Collective summing reduction
      • 8.2.36 _gfortran_caf_co_reduce — Generic collective reduction
  • 9 Intrinsic Procedures
    • 9.1 Introduction to intrinsic procedures
    • 9.2 ABORT — Abort the program
    • 9.3 ABS — Absolute value
    • 9.4 ACCESS — Checks file access modes
    • 9.5 ACHAR — Character in ASCII collating sequence
    • 9.6 ACOS — Arccosine function
    • 9.7 ACOSD — Arccosine function, degrees
    • 9.8 ACOSH — Inverse hyperbolic cosine function
    • 9.9 ADJUSTL — Left adjust a string
    • 9.10 ADJUSTR — Right adjust a string
    • 9.11 AIMAG — Imaginary part of complex number
    • 9.12 AINT — Truncate to a whole number
    • 9.13 ALARM — Execute a routine after a given delay
    • 9.14 ALL — All values in MASK along DIM are true
    • 9.15 ALLOCATED — Status of an allocatable entity
    • 9.16 AND — Bitwise logical AND
    • 9.17 ANINT — Nearest whole number
    • 9.18 ANY — Any value in MASK along DIM is true
    • 9.19 ASIN — Arcsine function
    • 9.20 ASIND — Arcsine function, degrees
    • 9.21 ASINH — Inverse hyperbolic sine function
    • 9.22 ASSOCIATED — Status of a pointer or pointer/target pair
    • 9.23 ATAN — Arctangent function
    • 9.24 ATAND — Arctangent function, degrees
    • 9.25 ATAN2 — Arctangent function
    • 9.26 ATAN2D — Arctangent function, degrees
    • 9.27 ATANH — Inverse hyperbolic tangent function
    • 9.28 ATOMIC_ADD — Atomic ADD operation
    • 9.29 ATOMIC_AND — Atomic bitwise AND operation
    • 9.30 ATOMIC_CAS — Atomic compare and swap
    • 9.31 ATOMIC_DEFINE — Setting a variable atomically
    • 9.32 ATOMIC_FETCH_ADD — Atomic ADD operation with prior fetch
    • 9.33 ATOMIC_FETCH_AND — Atomic bitwise AND operation with prior fetch
    • 9.34 ATOMIC_FETCH_OR — Atomic bitwise OR operation with prior fetch
    • 9.35 ATOMIC_FETCH_XOR — Atomic bitwise XOR operation with prior fetch
    • 9.36 ATOMIC_OR — Atomic bitwise OR operation
    • 9.37 ATOMIC_REF — Obtaining the value of a variable atomically
    • 9.38 ATOMIC_XOR — Atomic bitwise OR operation
    • 9.39 BACKTRACE — Show a backtrace
    • 9.40 BESSEL_J0 — Bessel function of the first kind of order 0
    • 9.41 BESSEL_J1 — Bessel function of the first kind of order 1
    • 9.42 BESSEL_JN — Bessel function of the first kind
    • 9.43 BESSEL_Y0 — Bessel function of the second kind of order 0
    • 9.44 BESSEL_Y1 — Bessel function of the second kind of order 1
    • 9.45 BESSEL_YN — Bessel function of the second kind
    • 9.46 BGE — Bitwise greater than or equal to
    • 9.47 BGT — Bitwise greater than
    • 9.48 BIT_SIZE — Bit size inquiry function
    • 9.49 BLE — Bitwise less than or equal to
    • 9.50 BLT — Bitwise less than
    • 9.51 BTEST — Bit test function
    • 9.52 C_ASSOCIATED — Status of a C pointer
    • 9.53 C_F_POINTER — Convert C into Fortran pointer
    • 9.54 C_F_PROCPOINTER — Convert C into Fortran procedure pointer
    • 9.55 C_FUNLOC — Obtain the C address of a procedure
    • 9.56 C_LOC — Obtain the C address of an object
    • 9.57 C_SIZEOF — Size in bytes of an expression
    • 9.58 CEILING — Integer ceiling function
    • 9.59 CHAR — Character conversion function
    • 9.60 CHDIR — Change working directory
    • 9.61 CHMOD — Change access permissions of files
    • 9.62 CMPLX — Complex conversion function
    • 9.63 CO_BROADCAST — Copy a value to all images the current set of images
    • 9.64 CO_MAX — Maximal value on the current set of images
    • 9.65 CO_MIN — Minimal value on the current set of images
    • 9.66 CO_REDUCE — Reduction of values on the current set of images
    • 9.67 CO_SUM — Sum of values on the current set of images
    • 9.68 COMMAND_ARGUMENT_COUNT — Get number of command line arguments
    • 9.69 COMPILER_OPTIONS — Options passed to the compiler
    • 9.70 COMPILER_VERSION — Compiler version string
    • 9.71 COMPLEX — Complex conversion function
    • 9.72 CONJG — Complex conjugate function
    • 9.73 COS — Cosine function
    • 9.74 COSD — Cosine function, degrees
    • 9.75 COSH — Hyperbolic cosine function
    • 9.76 COTAN — Cotangent function
    • 9.77 COTAND — Cotangent function, degrees
    • 9.78 COUNT — Count function
    • 9.79 CPU_TIME — CPU elapsed time in seconds
    • 9.80 CSHIFT — Circular shift elements of an array
    • 9.81 CTIME — Convert a time into a string
    • 9.82 DATE_AND_TIME — Date and time subroutine
    • 9.83 DBLE — Double conversion function
    • 9.84 DCMPLX — Double complex conversion function
    • 9.85 DIGITS — Significant binary digits function
    • 9.86 DIM — Positive difference
    • 9.87 DOT_PRODUCT — Dot product function
    • 9.88 DPROD — Double product function
    • 9.89 DREAL — Double real part function
    • 9.90 DSHIFTL — Combined left shift
    • 9.91 DSHIFTR — Combined right shift
    • 9.92 DTIME — Execution time subroutine (or function)
    • 9.93 EOSHIFT — End-off shift elements of an array
    • 9.94 EPSILON — Epsilon function
    • 9.95 ERF — Error function
    • 9.96 ERFC — Error function
    • 9.97 ERFC_SCALED — Error function
    • 9.98 ETIME — Execution time subroutine (or function)
    • 9.99 EVENT_QUERY — Query whether a coarray event has occurred
    • 9.100 EXECUTE_COMMAND_LINE — Execute a shell command
    • 9.101 EXIT — Exit the program with status.
    • 9.102 EXP — Exponential function
    • 9.103 EXPONENT — Exponent function
    • 9.104 EXTENDS_TYPE_OF — Query dynamic type for extension
    • 9.105 FDATE — Get the current time as a string
    • 9.106 FGET — Read a single character in stream mode from stdin
    • 9.107 FGETC — Read a single character in stream mode
    • 9.108 FINDLOC — Search an array for a value
    • 9.109 FLOOR — Integer floor function
    • 9.110 FLUSH — Flush I/O unit(s)
    • 9.111 FNUM — File number function
    • 9.112 FPUT — Write a single character in stream mode to stdout
    • 9.113 FPUTC — Write a single character in stream mode
    • 9.114 FRACTION — Fractional part of the model representation
    • 9.115 FREE — Frees memory
    • 9.116 FSEEK — Low level file positioning subroutine
    • 9.117 FSTAT — Get file status
    • 9.118 FTELL — Current stream position
    • 9.119 GAMMA — Gamma function
    • 9.120 GERROR — Get last system error message
    • 9.121 GETARG — Get command line arguments
    • 9.122 GET_COMMAND — Get the entire command line
    • 9.123 GET_COMMAND_ARGUMENT — Get command line arguments
    • 9.124 GETCWD — Get current working directory
    • 9.125 GETENV — Get an environmental variable
    • 9.126 GET_ENVIRONMENT_VARIABLE — Get an environmental variable
    • 9.127 GETGID — Group ID function
    • 9.128 GETLOG — Get login name
    • 9.129 GETPID — Process ID function
    • 9.130 GETUID — User ID function
    • 9.131 GMTIME — Convert time to GMT info
    • 9.132 HOSTNM — Get system host name
    • 9.133 HUGE — Largest number of a kind
    • 9.134 HYPOT — Euclidean distance function
    • 9.135 IACHAR — Code in ASCII collating sequence
    • 9.136 IALL — Bitwise AND of array elements
    • 9.137 IAND — Bitwise logical and
    • 9.138 IANY — Bitwise OR of array elements
    • 9.139 IARGC — Get the number of command line arguments
    • 9.140 IBCLR — Clear bit
    • 9.141 IBITS — Bit extraction
    • 9.142 IBSET — Set bit
    • 9.143 ICHAR — Character-to-integer conversion function
    • 9.144 IDATE — Get current local time subroutine (day/month/year)
    • 9.145 IEOR — Bitwise logical exclusive or
    • 9.146 IERRNO — Get the last system error number
    • 9.147 IMAGE_INDEX — Function that converts a cosubscript to an image index
    • 9.148 INDEX — Position of a substring within a string
    • 9.149 INT — Convert to integer type
    • 9.150 INT2 — Convert to 16-bit integer type
    • 9.151 INT8 — Convert to 64-bit integer type
    • 9.152 IOR — Bitwise logical or
    • 9.153 IPARITY — Bitwise XOR of array elements
    • 9.154 IRAND — Integer pseudo-random number
    • 9.155 IS_CONTIGUOUS — Test whether an array is contiguous
    • 9.156 IS_IOSTAT_END — Test for end-of-file value
    • 9.157 IS_IOSTAT_EOR — Test for end-of-record value
    • 9.158 ISATTY — Whether a unit is a terminal device.
    • 9.159 ISHFT — Shift bits
    • 9.160 ISHFTC — Shift bits circularly
    • 9.161 ISNAN — Test for a NaN
    • 9.162 ITIME — Get current local time subroutine (hour/minutes/seconds)
    • 9.163 KILL — Send a signal to a process
    • 9.164 KIND — Kind of an entity
    • 9.165 LBOUND — Lower dimension bounds of an array
    • 9.166 LCOBOUND — Lower codimension bounds of an array
    • 9.167 LEADZ — Number of leading zero bits of an integer
    • 9.168 LEN — Length of a character entity
    • 9.169 LEN_TRIM — Length of a character entity without trailing blank characters
    • 9.170 LGE — Lexical greater than or equal
    • 9.171 LGT — Lexical greater than
    • 9.172 LINK — Create a hard link
    • 9.173 LLE — Lexical less than or equal
    • 9.174 LLT — Lexical less than
    • 9.175 LNBLNK — Index of the last non-blank character in a string
    • 9.176 LOC — Returns the address of a variable
    • 9.177 LOG — Natural logarithm function
    • 9.178 LOG10 — Base 10 logarithm function
    • 9.179 LOG_GAMMA — Logarithm of the Gamma function
    • 9.180 LOGICAL — Convert to logical type
    • 9.181 LONG — Convert to integer type
    • 9.182 LSHIFT — Left shift bits
    • 9.183 LSTAT — Get file status
    • 9.184 LTIME — Convert time to local time info
    • 9.185 MALLOC — Allocate dynamic memory
    • 9.186 MASKL — Left justified mask
    • 9.187 MASKR — Right justified mask
    • 9.188 MATMUL — matrix multiplication
    • 9.189 MAX — Maximum value of an argument list
    • 9.190 MAXEXPONENT — Maximum exponent of a real kind
    • 9.191 MAXLOC — Location of the maximum value within an array
    • 9.192 MAXVAL — Maximum value of an array
    • 9.193 MCLOCK — Time function
    • 9.194 MCLOCK8 — Time function (64-bit)
    • 9.195 MERGE — Merge variables
    • 9.196 MERGE_BITS — Merge of bits under mask
    • 9.197 MIN — Minimum value of an argument list
    • 9.198 MINEXPONENT — Minimum exponent of a real kind
    • 9.199 MINLOC — Location of the minimum value within an array
    • 9.200 MINVAL — Minimum value of an array
    • 9.201 MOD — Remainder function
    • 9.202 MODULO — Modulo function
    • 9.203 MOVE_ALLOC — Move allocation from one object to another
    • 9.204 MVBITS — Move bits from one integer to another
    • 9.205 NEAREST — Nearest representable number
    • 9.206 NEW_LINE — New line character
    • 9.207 NINT — Nearest whole number
    • 9.208 NORM2 — Euclidean vector norms
    • 9.209 NOT — Logical negation
    • 9.210 NULL — Function that returns an disassociated pointer
    • 9.211 NUM_IMAGES — Function that returns the number of images
    • 9.212 OR — Bitwise logical OR
    • 9.213 PACK — Pack an array into an array of rank one
    • 9.214 PARITY — Reduction with exclusive OR
    • 9.215 PERROR — Print system error message
    • 9.216 POPCNT — Number of bits set
    • 9.217 POPPAR — Parity of the number of bits set
    • 9.218 PRECISION — Decimal precision of a real kind
    • 9.219 PRESENT — Determine whether an optional dummy argument is specified
    • 9.220 PRODUCT — Product of array elements
    • 9.221 RADIX — Base of a model number
    • 9.222 RAN — Real pseudo-random number
    • 9.223 RAND — Real pseudo-random number
    • 9.224 RANDOM_INIT — Initialize a pseudo-random number generator
    • 9.225 RANDOM_NUMBER — Pseudo-random number
    • 9.226 RANDOM_SEED — Initialize a pseudo-random number sequence
    • 9.227 RANGE — Decimal exponent range
    • 9.228 RANK — Rank of a data object
    • 9.229 REAL — Convert to real type
    • 9.230 RENAME — Rename a file
    • 9.231 REPEAT — Repeated string concatenation
    • 9.232 RESHAPE — Function to reshape an array
    • 9.233 RRSPACING — Reciprocal of the relative spacing
    • 9.234 RSHIFT — Right shift bits
    • 9.235 SAME_TYPE_AS — Query dynamic types for equality
    • 9.236 SCALE — Scale a real value
    • 9.237 SCAN — Scan a string for the presence of a set of characters
    • 9.238 SECNDS — Time function
    • 9.239 SECOND — CPU time function
    • 9.240 SELECTED_CHAR_KIND — Choose character kind
    • 9.241 SELECTED_INT_KIND — Choose integer kind
    • 9.242 SELECTED_REAL_KIND — Choose real kind
    • 9.243 SET_EXPONENT — Set the exponent of the model
    • 9.244 SHAPE — Determine the shape of an array
    • 9.245 SHIFTA — Right shift with fill
    • 9.246 SHIFTL — Left shift
    • 9.247 SHIFTR — Right shift
    • 9.248 SIGN — Sign copying function
    • 9.249 SIGNAL — Signal handling subroutine (or function)
    • 9.250 SIN — Sine function
    • 9.251 SIND — Sine function, degrees
    • 9.252 SINH — Hyperbolic sine function
    • 9.253 SIZE — Determine the size of an array
    • 9.254 SIZEOF — Size in bytes of an expression
    • 9.255 SLEEP — Sleep for the specified number of seconds
    • 9.256 SPACING — Smallest distance between two numbers of a given type
    • 9.257 SPREAD — Add a dimension to an array
    • 9.258 SQRT — Square-root function
    • 9.259 SRAND — Reinitialize the random number generator
    • 9.260 STAT — Get file status
    • 9.261 STORAGE_SIZE — Storage size in bits
    • 9.262 SUM — Sum of array elements
    • 9.263 SYMLNK — Create a symbolic link
    • 9.264 SYSTEM — Execute a shell command
    • 9.265 SYSTEM_CLOCK — Time function
    • 9.266 TAN — Tangent function
    • 9.267 TAND — Tangent function, degrees
    • 9.268 TANH — Hyperbolic tangent function
    • 9.269 THIS_IMAGE — Function that returns the cosubscript index of this image
    • 9.270 TIME — Time function
    • 9.271 TIME8 — Time function (64-bit)
    • 9.272 TINY — Smallest positive number of a real kind
    • 9.273 TRAILZ — Number of trailing zero bits of an integer
    • 9.274 TRANSFER — Transfer bit patterns
    • 9.275 TRANSPOSE — Transpose an array of rank two
    • 9.276 TRIM — Remove trailing blank characters of a string
    • 9.277 TTYNAM — Get the name of a terminal device.
    • 9.278 UBOUND — Upper dimension bounds of an array
    • 9.279 UCOBOUND — Upper codimension bounds of an array
    • 9.280 UMASK — Set the file creation mask
    • 9.281 UNLINK — Remove a file from the file system
    • 9.282 UNPACK — Unpack an array of rank one into an array
    • 9.283 VERIFY — Scan a string for characters not a given set
    • 9.284 XOR — Bitwise logical exclusive OR
  • 10 Intrinsic Modules
    • 10.1 ISO_FORTRAN_ENV
    • 10.2 ISO_C_BINDING
    • 10.3 IEEE modules: IEEE_EXCEPTIONS, IEEE_ARITHMETIC, and IEEE_FEATURES
    • 10.4 OpenMP Modules OMP_LIB and OMP_LIB_KINDS
    • 10.5 OpenACC Module OPENACC
  • Contributing
    • Contributors to GNU Fortran
    • Projects
    • Proposed Extensions
      • Compiler extensions:
      • Environment Options
  • GNU General Public License
  • GNU Free Documentation License
    • ADDENDUM: How to use this License for your documents
  • Funding Free Software
  • Option Index
  • Keyword Index

Introduction

This manual documents the use of gfortran, the GNU Fortran compiler. You can find in this manual how to invoke gfortran, as well as its features and incompatibilities.

• Introduction:
Part I: Invoking GNU Fortran
• Invoking GNU Fortran: Command options supported by gfortran.
• Runtime: Influencing runtime behavior with environment variables.
Part II: Language Reference
• Fortran standards status: Fortran 2003, 2008 and 2018 features supported by GNU Fortran.
• Compiler Characteristics: User-visible implementation details.
• Extensions: Language extensions implemented by GNU Fortran.
• Mixed-Language Programming: Interoperability with C
• Coarray Programming:
• Intrinsic Procedures: Intrinsic procedures supported by GNU Fortran.
• Intrinsic Modules: Intrinsic modules supported by GNU Fortran.
• Contributing: How you can help.
• Copying: GNU General Public License says how you can copy and share GNU Fortran.
• GNU Free Documentation License: How you can copy and share this manual.
• Funding: How to help assure continued work for free software.
• Option Index: Index of command line options
• Keyword Index: Index of concepts

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Spec-Zone.ru

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Spec-Zone .ru
спецификации, руководства, описания, API