Spec-Zone.ru › GNU Fortran 13

Short Table of Contents

  • 1 Introduction
  • 2 GNU Fortran Command Options
  • 3 Runtime: Influencing runtime behavior with environment variables
  • 4 Compiler Characteristics
  • 5 Extensions
  • 6 Mixed-Language Programming
  • 7 Coarray Programming
  • 8 Intrinsic Procedures
  • 9 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 Standards
      • 1.3.1 Fortran 95 status
      • 1.3.2 Fortran 2003 status
      • 1.3.3 Fortran 2008 status
      • 1.3.4 Fortran 2018 status
  • 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 conversion 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 Compiler Characteristics
    • 4.1 KIND Type Parameters
    • 4.2 Internal representation of LOGICAL variables
    • 4.3 Evaluation of logical expressions
    • 4.4 MAX and MIN intrinsics with REAL NaN arguments
    • 4.5 Thread-safety of the runtime library
    • 4.6 Data consistency and durability
    • 4.7 Files opened without an explicit ACTION= specifier
    • 4.8 File operations on symbolic links
    • 4.9 File format of unformatted sequential files
    • 4.10 Asynchronous I/O
    • 4.11 Behavior on integer overflow
  • 5 Extensions
    • 5.1 Extensions implemented in GNU Fortran
      • 5.1.1 Old-style kind specifications
      • 5.1.2 Old-style variable initialization
      • 5.1.3 Extensions to namelist
      • 5.1.4 X format descriptor without count field
      • 5.1.5 Commas in FORMAT specifications
      • 5.1.6 Missing period in FORMAT specifications
      • 5.1.7 Default widths for F, G and I format descriptors
      • 5.1.8 I/O item lists
      • 5.1.9 Q exponent-letter
      • 5.1.10 BOZ literal constants
      • 5.1.11 Real array indices
      • 5.1.12 Unary operators
      • 5.1.13 Implicitly convert LOGICAL and INTEGER values
      • 5.1.14 Hollerith constants support
      • 5.1.15 Character conversion
      • 5.1.16 Cray pointers
      • 5.1.17 CONVERT specifier
      • 5.1.18 OpenMP
      • 5.1.19 OpenACC
      • 5.1.20 Argument list functions %VAL, %REF and %LOC
      • 5.1.21 Read/Write after EOF marker
      • 5.1.22 STRUCTURE and RECORD
      • 5.1.23 UNION and MAP
      • 5.1.24 Type variants for integer intrinsics
      • 5.1.25 AUTOMATIC and STATIC attributes
      • 5.1.26 Extended math intrinsics
      • 5.1.27 Form feed as whitespace
      • 5.1.28 TYPE as an alias for PRINT
      • 5.1.29 %LOC as an rvalue
      • 5.1.30 .XOR. operator
      • 5.1.31 Bitwise logical operators
      • 5.1.32 Extended I/O specifiers
      • 5.1.33 Legacy PARAMETER statements
      • 5.1.34 Default exponents
    • 5.2 Extensions not implemented in GNU Fortran
      • 5.2.1 ENCODE and DECODE statements
      • 5.2.2 Variable FORMAT expressions
      • 5.2.3 Alternate complex function syntax
      • 5.2.4 Volatile COMMON blocks
      • 5.2.5 OPEN( ... NAME=)
      • 5.2.6 Q edit descriptor
  • 6 Mixed-Language Programming
    • 6.1 Interoperability with C
      • 6.1.1 Intrinsic Types
      • 6.1.2 Derived Types and struct
      • 6.1.3 Interoperable Global Variables
      • 6.1.4 Interoperable Subroutines and Functions
      • 6.1.5 Working with C Pointers
      • 6.1.6 Further Interoperability of Fortran with C
    • 6.2 GNU Fortran Compiler Directives
      • 6.2.1 ATTRIBUTES directive
      • 6.2.2 UNROLL directive
      • 6.2.3 BUILTIN directive
      • 6.2.4 IVDEP directive
      • 6.2.5 VECTOR directive
      • 6.2.6 NOVECTOR directive
    • 6.3 Non-Fortran Main Program
      • 6.3.1 _gfortran_set_args — Save command-line arguments
      • 6.3.2 _gfortran_set_options — Set library option flags
      • 6.3.3 _gfortran_set_convert — Set endian conversion
      • 6.3.4 _gfortran_set_record_marker — Set length of record markers
      • 6.3.5 _gfortran_set_fpe — Enable floating point exception traps
      • 6.3.6 _gfortran_set_max_subrecord_length — Set subrecord length
    • 6.4 Naming and argument-passing conventions
      • 6.4.1 Naming conventions
      • 6.4.2 Argument passing conventions
  • 7 Coarray Programming
    • 7.1 Type and enum ABI Documentation
      • 7.1.1 caf_token_t
      • 7.1.2 caf_register_t
      • 7.1.3 caf_deregister_t
      • 7.1.4 caf_reference_t
      • 7.1.5 caf_team_t
    • 7.2 Function ABI Documentation
      • 7.2.1 _gfortran_caf_init — Initialiation function
      • 7.2.2 _gfortran_caf_finish — Finalization function
      • 7.2.3 _gfortran_caf_this_image — Querying the image number
      • 7.2.4 _gfortran_caf_num_images — Querying the maximal number of images
      • 7.2.5 _gfortran_caf_image_status — Query the status of an image
      • 7.2.6 _gfortran_caf_failed_images — Get an array of the indexes of the failed images
      • 7.2.7 _gfortran_caf_stopped_images — Get an array of the indexes of the stopped images
      • 7.2.8 _gfortran_caf_register — Registering coarrays
      • 7.2.9 _gfortran_caf_deregister — Deregistering coarrays
      • 7.2.10 _gfortran_caf_is_present — Query whether an allocatable or pointer component in a derived type coarray is allocated
      • 7.2.11 _gfortran_caf_send — Sending data from a local image to a remote image
      • 7.2.12 _gfortran_caf_get — Getting data from a remote image
      • 7.2.13 _gfortran_caf_sendget — Sending data between remote images
      • 7.2.14 _gfortran_caf_send_by_ref — Sending data from a local image to a remote image with enhanced referencing options
      • 7.2.15 _gfortran_caf_get_by_ref — Getting data from a remote image using enhanced references
      • 7.2.16 _gfortran_caf_sendget_by_ref — Sending data between remote images using enhanced references on both sides
      • 7.2.17 _gfortran_caf_lock — Locking a lock variable
      • 7.2.18 _gfortran_caf_lock — Unlocking a lock variable
      • 7.2.19 _gfortran_caf_event_post — Post an event
      • 7.2.20 _gfortran_caf_event_wait — Wait that an event occurred
      • 7.2.21 _gfortran_caf_event_query — Query event count
      • 7.2.22 _gfortran_caf_sync_all — All-image barrier
      • 7.2.23 _gfortran_caf_sync_images — Barrier for selected images
      • 7.2.24 _gfortran_caf_sync_memory — Wait for completion of segment-memory operations
      • 7.2.25 _gfortran_caf_error_stop — Error termination with exit code
      • 7.2.26 _gfortran_caf_error_stop_str — Error termination with string
      • 7.2.27 _gfortran_caf_fail_image — Mark the image failed and end its execution
      • 7.2.28 _gfortran_caf_atomic_define — Atomic variable assignment
      • 7.2.29 _gfortran_caf_atomic_ref — Atomic variable reference
      • 7.2.30 _gfortran_caf_atomic_cas — Atomic compare and swap
      • 7.2.31 _gfortran_caf_atomic_op — Atomic operation
      • 7.2.32 _gfortran_caf_co_broadcast — Sending data to all images
      • 7.2.33 _gfortran_caf_co_max — Collective maximum reduction
      • 7.2.34 _gfortran_caf_co_min — Collective minimum reduction
      • 7.2.35 _gfortran_caf_co_sum — Collective summing reduction
      • 7.2.36 _gfortran_caf_co_reduce — Generic collective reduction
  • 8 Intrinsic Procedures
    • 8.1 Introduction to intrinsic procedures
    • 8.2 ABORT — Abort the program
    • 8.3 ABS — Absolute value
    • 8.4 ACCESS — Checks file access modes
    • 8.5 ACHAR — Character in ASCII collating sequence
    • 8.6 ACOS — Arccosine function
    • 8.7 ACOSD — Arccosine function, degrees
    • 8.8 ACOSH — Inverse hyperbolic cosine function
    • 8.9 ADJUSTL — Left adjust a string
    • 8.10 ADJUSTR — Right adjust a string
    • 8.11 AIMAG — Imaginary part of complex number
    • 8.12 AINT — Truncate to a whole number
    • 8.13 ALARM — Execute a routine after a given delay
    • 8.14 ALL — All values in MASK along DIM are true
    • 8.15 ALLOCATED — Status of an allocatable entity
    • 8.16 AND — Bitwise logical AND
    • 8.17 ANINT — Nearest whole number
    • 8.18 ANY — Any value in MASK along DIM is true
    • 8.19 ASIN — Arcsine function
    • 8.20 ASIND — Arcsine function, degrees
    • 8.21 ASINH — Inverse hyperbolic sine function
    • 8.22 ASSOCIATED — Status of a pointer or pointer/target pair
    • 8.23 ATAN — Arctangent function
    • 8.24 ATAND — Arctangent function, degrees
    • 8.25 ATAN2 — Arctangent function
    • 8.26 ATAN2D — Arctangent function, degrees
    • 8.27 ATANH — Inverse hyperbolic tangent function
    • 8.28 ATOMIC_ADD — Atomic ADD operation
    • 8.29 ATOMIC_AND — Atomic bitwise AND operation
    • 8.30 ATOMIC_CAS — Atomic compare and swap
    • 8.31 ATOMIC_DEFINE — Setting a variable atomically
    • 8.32 ATOMIC_FETCH_ADD — Atomic ADD operation with prior fetch
    • 8.33 ATOMIC_FETCH_AND — Atomic bitwise AND operation with prior fetch
    • 8.34 ATOMIC_FETCH_OR — Atomic bitwise OR operation with prior fetch
    • 8.35 ATOMIC_FETCH_XOR — Atomic bitwise XOR operation with prior fetch
    • 8.36 ATOMIC_OR — Atomic bitwise OR operation
    • 8.37 ATOMIC_REF — Obtaining the value of a variable atomically
    • 8.38 ATOMIC_XOR — Atomic bitwise OR operation
    • 8.39 BACKTRACE — Show a backtrace
    • 8.40 BESSEL_J0 — Bessel function of the first kind of order 0
    • 8.41 BESSEL_J1 — Bessel function of the first kind of order 1
    • 8.42 BESSEL_JN — Bessel function of the first kind
    • 8.43 BESSEL_Y0 — Bessel function of the second kind of order 0
    • 8.44 BESSEL_Y1 — Bessel function of the second kind of order 1
    • 8.45 BESSEL_YN — Bessel function of the second kind
    • 8.46 BGE — Bitwise greater than or equal to
    • 8.47 BGT — Bitwise greater than
    • 8.48 BIT_SIZE — Bit size inquiry function
    • 8.49 BLE — Bitwise less than or equal to
    • 8.50 BLT — Bitwise less than
    • 8.51 BTEST — Bit test function
    • 8.52 C_ASSOCIATED — Status of a C pointer
    • 8.53 C_F_POINTER — Convert C into Fortran pointer
    • 8.54 C_F_PROCPOINTER — Convert C into Fortran procedure pointer
    • 8.55 C_FUNLOC — Obtain the C address of a procedure
    • 8.56 C_LOC — Obtain the C address of an object
    • 8.57 C_SIZEOF — Size in bytes of an expression
    • 8.58 CEILING — Integer ceiling function
    • 8.59 CHAR — Character conversion function
    • 8.60 CHDIR — Change working directory
    • 8.61 CHMOD — Change access permissions of files
    • 8.62 CMPLX — Complex conversion function
    • 8.63 CO_BROADCAST — Copy a value to all images the current set of images
    • 8.64 CO_MAX — Maximal value on the current set of images
    • 8.65 CO_MIN — Minimal value on the current set of images
    • 8.66 CO_REDUCE — Reduction of values on the current set of images
    • 8.67 CO_SUM — Sum of values on the current set of images
    • 8.68 COMMAND_ARGUMENT_COUNT — Get number of command line arguments
    • 8.69 COMPILER_OPTIONS — Options passed to the compiler
    • 8.70 COMPILER_VERSION — Compiler version string
    • 8.71 COMPLEX — Complex conversion function
    • 8.72 CONJG — Complex conjugate function
    • 8.73 COS — Cosine function
    • 8.74 COSD — Cosine function, degrees
    • 8.75 COSH — Hyperbolic cosine function
    • 8.76 COTAN — Cotangent function
    • 8.77 COTAND — Cotangent function, degrees
    • 8.78 COUNT — Count function
    • 8.79 CPU_TIME — CPU elapsed time in seconds
    • 8.80 CSHIFT — Circular shift elements of an array
    • 8.81 CTIME — Convert a time into a string
    • 8.82 DATE_AND_TIME — Date and time subroutine
    • 8.83 DBLE — Double conversion function
    • 8.84 DCMPLX — Double complex conversion function
    • 8.85 DIGITS — Significant binary digits function
    • 8.86 DIM — Positive difference
    • 8.87 DOT_PRODUCT — Dot product function
    • 8.88 DPROD — Double product function
    • 8.89 DREAL — Double real part function
    • 8.90 DSHIFTL — Combined left shift
    • 8.91 DSHIFTR — Combined right shift
    • 8.92 DTIME — Execution time subroutine (or function)
    • 8.93 EOSHIFT — End-off shift elements of an array
    • 8.94 EPSILON — Epsilon function
    • 8.95 ERF — Error function
    • 8.96 ERFC — Error function
    • 8.97 ERFC_SCALED — Error function
    • 8.98 ETIME — Execution time subroutine (or function)
    • 8.99 EVENT_QUERY — Query whether a coarray event has occurred
    • 8.100 EXECUTE_COMMAND_LINE — Execute a shell command
    • 8.101 EXIT — Exit the program with status.
    • 8.102 EXP — Exponential function
    • 8.103 EXPONENT — Exponent function
    • 8.104 EXTENDS_TYPE_OF — Query dynamic type for extension
    • 8.105 FDATE — Get the current time as a string
    • 8.106 FGET — Read a single character in stream mode from stdin
    • 8.107 FGETC — Read a single character in stream mode
    • 8.108 FINDLOC — Search an array for a value
    • 8.109 FLOOR — Integer floor function
    • 8.110 FLUSH — Flush I/O unit(s)
    • 8.111 FNUM — File number function
    • 8.112 FPUT — Write a single character in stream mode to stdout
    • 8.113 FPUTC — Write a single character in stream mode
    • 8.114 FRACTION — Fractional part of the model representation
    • 8.115 FREE — Frees memory
    • 8.116 FSEEK — Low level file positioning subroutine
    • 8.117 FSTAT — Get file status
    • 8.118 FTELL — Current stream position
    • 8.119 GAMMA — Gamma function
    • 8.120 GERROR — Get last system error message
    • 8.121 GETARG — Get command line arguments
    • 8.122 GET_COMMAND — Get the entire command line
    • 8.123 GET_COMMAND_ARGUMENT — Get command line arguments
    • 8.124 GETCWD — Get current working directory
    • 8.125 GETENV — Get an environmental variable
    • 8.126 GET_ENVIRONMENT_VARIABLE — Get an environmental variable
    • 8.127 GETGID — Group ID function
    • 8.128 GETLOG — Get login name
    • 8.129 GETPID — Process ID function
    • 8.130 GETUID — User ID function
    • 8.131 GMTIME — Convert time to GMT info
    • 8.132 HOSTNM — Get system host name
    • 8.133 HUGE — Largest number of a kind
    • 8.134 HYPOT — Euclidean distance function
    • 8.135 IACHAR — Code in ASCII collating sequence
    • 8.136 IALL — Bitwise AND of array elements
    • 8.137 IAND — Bitwise logical and
    • 8.138 IANY — Bitwise OR of array elements
    • 8.139 IARGC — Get the number of command line arguments
    • 8.140 IBCLR — Clear bit
    • 8.141 IBITS — Bit extraction
    • 8.142 IBSET — Set bit
    • 8.143 ICHAR — Character-to-integer conversion function
    • 8.144 IDATE — Get current local time subroutine (day/month/year)
    • 8.145 IEOR — Bitwise logical exclusive or
    • 8.146 IERRNO — Get the last system error number
    • 8.147 IMAGE_INDEX — Function that converts a cosubscript to an image index
    • 8.148 INDEX — Position of a substring within a string
    • 8.149 INT — Convert to integer type
    • 8.150 INT2 — Convert to 16-bit integer type
    • 8.151 INT8 — Convert to 64-bit integer type
    • 8.152 IOR — Bitwise logical or
    • 8.153 IPARITY — Bitwise XOR of array elements
    • 8.154 IRAND — Integer pseudo-random number
    • 8.155 IS_CONTIGUOUS — Test whether an array is contiguous
    • 8.156 IS_IOSTAT_END — Test for end-of-file value
    • 8.157 IS_IOSTAT_EOR — Test for end-of-record value
    • 8.158 ISATTY — Whether a unit is a terminal device
    • 8.159 ISHFT — Shift bits
    • 8.160 ISHFTC — Shift bits circularly
    • 8.161 ISNAN — Test for a NaN
    • 8.162 ITIME — Get current local time subroutine (hour/minutes/seconds)
    • 8.163 KILL — Send a signal to a process
    • 8.164 KIND — Kind of an entity
    • 8.165 LBOUND — Lower dimension bounds of an array
    • 8.166 LCOBOUND — Lower codimension bounds of an array
    • 8.167 LEADZ — Number of leading zero bits of an integer
    • 8.168 LEN — Length of a character entity
    • 8.169 LEN_TRIM — Length of a character entity without trailing blank characters
    • 8.170 LGE — Lexical greater than or equal
    • 8.171 LGT — Lexical greater than
    • 8.172 LINK — Create a hard link
    • 8.173 LLE — Lexical less than or equal
    • 8.174 LLT — Lexical less than
    • 8.175 LNBLNK — Index of the last non-blank character in a string
    • 8.176 LOC — Returns the address of a variable
    • 8.177 LOG — Natural logarithm function
    • 8.178 LOG10 — Base 10 logarithm function
    • 8.179 LOG_GAMMA — Logarithm of the Gamma function
    • 8.180 LOGICAL — Convert to logical type
    • 8.181 LSHIFT — Left shift bits
    • 8.182 LSTAT — Get file status
    • 8.183 LTIME — Convert time to local time info
    • 8.184 MALLOC — Allocate dynamic memory
    • 8.185 MASKL — Left justified mask
    • 8.186 MASKR — Right justified mask
    • 8.187 MATMUL — matrix multiplication
    • 8.188 MAX — Maximum value of an argument list
    • 8.189 MAXEXPONENT — Maximum exponent of a real kind
    • 8.190 MAXLOC — Location of the maximum value within an array
    • 8.191 MAXVAL — Maximum value of an array
    • 8.192 MCLOCK — Time function
    • 8.193 MCLOCK8 — Time function (64-bit)
    • 8.194 MERGE — Merge variables
    • 8.195 MERGE_BITS — Merge of bits under mask
    • 8.196 MIN — Minimum value of an argument list
    • 8.197 MINEXPONENT — Minimum exponent of a real kind
    • 8.198 MINLOC — Location of the minimum value within an array
    • 8.199 MINVAL — Minimum value of an array
    • 8.200 MOD — Remainder function
    • 8.201 MODULO — Modulo function
    • 8.202 MOVE_ALLOC — Move allocation from one object to another
    • 8.203 MVBITS — Move bits from one integer to another
    • 8.204 NEAREST — Nearest representable number
    • 8.205 NEW_LINE — New line character
    • 8.206 NINT — Nearest whole number
    • 8.207 NORM2 — Euclidean vector norms
    • 8.208 NOT — Logical negation
    • 8.209 NULL — Function that returns an disassociated pointer
    • 8.210 NUM_IMAGES — Function that returns the number of images
    • 8.211 OR — Bitwise logical OR
    • 8.212 PACK — Pack an array into an array of rank one
    • 8.213 PARITY — Reduction with exclusive OR
    • 8.214 PERROR — Print system error message
    • 8.215 POPCNT — Number of bits set
    • 8.216 POPPAR — Parity of the number of bits set
    • 8.217 PRECISION — Decimal precision of a real kind
    • 8.218 PRESENT — Determine whether an optional dummy argument is specified
    • 8.219 PRODUCT — Product of array elements
    • 8.220 RADIX — Base of a model number
    • 8.221 RAN — Real pseudo-random number
    • 8.222 RAND — Real pseudo-random number
    • 8.223 RANDOM_INIT — Initialize a pseudo-random number generator
    • 8.224 RANDOM_NUMBER — Pseudo-random number
    • 8.225 RANDOM_SEED — Initialize a pseudo-random number sequence
    • 8.226 RANGE — Decimal exponent range
    • 8.227 RANK — Rank of a data object
    • 8.228 REAL — Convert to real type
    • 8.229 RENAME — Rename a file
    • 8.230 REPEAT — Repeated string concatenation
    • 8.231 RESHAPE — Function to reshape an array
    • 8.232 RRSPACING — Reciprocal of the relative spacing
    • 8.233 RSHIFT — Right shift bits
    • 8.234 SAME_TYPE_AS — Query dynamic types for equality
    • 8.235 SCALE — Scale a real value
    • 8.236 SCAN — Scan a string for the presence of a set of characters
    • 8.237 SECNDS — Time function
    • 8.238 SECOND — CPU time function
    • 8.239 SELECTED_CHAR_KIND — Choose character kind
    • 8.240 SELECTED_INT_KIND — Choose integer kind
    • 8.241 SELECTED_REAL_KIND — Choose real kind
    • 8.242 SET_EXPONENT — Set the exponent of the model
    • 8.243 SHAPE — Determine the shape of an array
    • 8.244 SHIFTA — Right shift with fill
    • 8.245 SHIFTL — Left shift
    • 8.246 SHIFTR — Right shift
    • 8.247 SIGN — Sign copying function
    • 8.248 SIGNAL — Signal handling subroutine (or function)
    • 8.249 SIN — Sine function
    • 8.250 SIND — Sine function, degrees
    • 8.251 SINH — Hyperbolic sine function
    • 8.252 SIZE — Determine the size of an array
    • 8.253 SIZEOF — Size in bytes of an expression
    • 8.254 SLEEP — Sleep for the specified number of seconds
    • 8.255 SPACING — Smallest distance between two numbers of a given type
    • 8.256 SPREAD — Add a dimension to an array
    • 8.257 SQRT — Square-root function
    • 8.258 SRAND — Reinitialize the random number generator
    • 8.259 STAT — Get file status
    • 8.260 STORAGE_SIZE — Storage size in bits
    • 8.261 SUM — Sum of array elements
    • 8.262 SYMLNK — Create a symbolic link
    • 8.263 SYSTEM — Execute a shell command
    • 8.264 SYSTEM_CLOCK — Time function
    • 8.265 TAN — Tangent function
    • 8.266 TAND — Tangent function, degrees
    • 8.267 TANH — Hyperbolic tangent function
    • 8.268 THIS_IMAGE — Function that returns the cosubscript index of this image
    • 8.269 TIME — Time function
    • 8.270 TIME8 — Time function (64-bit)
    • 8.271 TINY — Smallest positive number of a real kind
    • 8.272 TRAILZ — Number of trailing zero bits of an integer
    • 8.273 TRANSFER — Transfer bit patterns
    • 8.274 TRANSPOSE — Transpose an array of rank two
    • 8.275 TRIM — Remove trailing blank characters of a string
    • 8.276 TTYNAM — Get the name of a terminal device
    • 8.277 UBOUND — Upper dimension bounds of an array
    • 8.278 UCOBOUND — Upper codimension bounds of an array
    • 8.279 UMASK — Set the file creation mask
    • 8.280 UNLINK — Remove a file from the file system
    • 8.281 UNPACK — Unpack an array of rank one into an array
    • 8.282 VERIFY — Scan a string for characters not a given set
    • 8.283 XOR — Bitwise logical exclusive OR
  • 9 Intrinsic Modules
    • 9.1 ISO_FORTRAN_ENV
    • 9.2 ISO_C_BINDING
    • 9.3 IEEE modules: IEEE_EXCEPTIONS, IEEE_ARITHMETIC, and IEEE_FEATURES
    • 9.4 OpenMP Modules OMP_LIB and OMP_LIB_KINDS
    • 9.5 OpenACC Module OPENACC
  • Contributing
    • Contributors to GNU Fortran
    • Projects
  • 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
  • GNU Fortran Command Options
  • Runtime: Influencing runtime behavior with environment variables
  • Compiler Characteristics
  • Extensions
  • Mixed-Language Programming
  • Coarray Programming
  • Intrinsic Procedures
  • Intrinsic Modules
  • Contributing
  • GNU General Public License
  • GNU Free Documentation License
  • Funding Free Software
  • Option Index
  • Keyword Index

© Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-13.3.0/gfortran/index.html

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