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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 2003 and 2008 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 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_DEFAULT_RECL—Default record length for new files
    • 3.10 GFORTRAN_LIST_SEPARATOR—Separator for list output
    • 3.11 GFORTRAN_CONVERT_UNIT—Set endianness for unformatted I/O
    • 3.12 GFORTRAN_ERROR_BACKTRACE—Show backtrace on run-time errors
  • 4 Fortran 2003 and 2008 Status
    • 4.1 Fortran 2003 status
    • 4.2 Fortran 2008 status
    • 4.3 Technical Specification 29113 Status
    • 4.4 Technical Specification 18508 Status
  • 5 Compiler Characteristics
    • 5.1 KIND Type Parameters
    • 5.2 Internal representation of LOGICAL variables
    • 5.3 Thread-safety of the runtime library
    • 5.4 Data consistency and durability
    • 5.5 Files opened without an explicit ACTION= specifier
    • 5.6 File operations on symbolic links
  • 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 I/O item lists
      • 6.1.8 Q exponent-letter
      • 6.1.9 BOZ literal constants
      • 6.1.10 Real array indices
      • 6.1.11 Unary operators
      • 6.1.12 Implicitly convert LOGICAL and INTEGER values
      • 6.1.13 Hollerith constants support
      • 6.1.14 Cray pointers
      • 6.1.15 CONVERT specifier
      • 6.1.16 OpenMP
      • 6.1.17 OpenACC
      • 6.1.18 Argument list functions %VAL, %REF and %LOC
      • 6.1.19 Read/Write after EOF marker
      • 6.1.20 STRUCTURE and RECORD
      • 6.1.21 UNION and MAP
    • 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=)
  • 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
    • 7.3 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
    • 8.2 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_register — Registering coarrays
      • 8.2.6 _gfortran_caf_deregister — Deregistering coarrays
      • 8.2.7 _gfortran_caf_send — Sending data from a local image to a remote image
      • 8.2.8 _gfortran_caf_get — Getting data from a remote image
      • 8.2.9 _gfortran_caf_sendget — Sending data between remote images
      • 8.2.10 _gfortran_caf_lock — Locking a lock variable
      • 8.2.11 _gfortran_caf_lock — Unlocking a lock variable
      • 8.2.12 _gfortran_caf_event_post — Post an event
      • 8.2.13 _gfortran_caf_event_wait — Wait that an event occurred
      • 8.2.14 _gfortran_caf_event_query — Query event count
      • 8.2.15 _gfortran_caf_sync_all — All-image barrier
      • 8.2.16 _gfortran_caf_sync_images — Barrier for selected images
      • 8.2.17 _gfortran_caf_sync_memory — Wait for completion of segment-memory operations
      • 8.2.18 _gfortran_caf_error_stop — Error termination with exit code
      • 8.2.19 _gfortran_caf_error_stop_str — Error termination with string
      • 8.2.20 _gfortran_caf_atomic_define — Atomic variable assignment
      • 8.2.21 _gfortran_caf_atomic_ref — Atomic variable reference
      • 8.2.22 _gfortran_caf_atomic_cas — Atomic compare and swap
      • 8.2.23 _gfortran_caf_atomic_op — Atomic operation
      • 8.2.24 _gfortran_caf_co_broadcast — Sending data to all images
      • 8.2.25 _gfortran_caf_co_max — Collective maximum reduction
      • 8.2.26 _gfortran_caf_co_min — Collective minimum reduction
      • 8.2.27 _gfortran_caf_co_sum — Collective summing reduction
      • 8.2.28 _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 ACOSH — Inverse hyperbolic cosine function
    • 9.8 ADJUSTL — Left adjust a string
    • 9.9 ADJUSTR — Right adjust a string
    • 9.10 AIMAG — Imaginary part of complex number
    • 9.11 AINT — Truncate to a whole number
    • 9.12 ALARM — Execute a routine after a given delay
    • 9.13 ALL — All values in MASK along DIM are true
    • 9.14 ALLOCATED — Status of an allocatable entity
    • 9.15 AND — Bitwise logical AND
    • 9.16 ANINT — Nearest whole number
    • 9.17 ANY — Any value in MASK along DIM is true
    • 9.18 ASIN — Arcsine function
    • 9.19 ASINH — Inverse hyperbolic sine function
    • 9.20 ASSOCIATED — Status of a pointer or pointer/target pair
    • 9.21 ATAN — Arctangent function
    • 9.22 ATAN2 — Arctangent function
    • 9.23 ATANH — Inverse hyperbolic tangent function
    • 9.24 ATOMIC_ADD — Atomic ADD operation
    • 9.25 ATOMIC_AND — Atomic bitwise AND operation
    • 9.26 ATOMIC_CAS — Atomic compare and swap
    • 9.27 ATOMIC_DEFINE — Setting a variable atomically
    • 9.28 ATOMIC_FETCH_ADD — Atomic ADD operation with prior fetch
    • 9.29 ATOMIC_FETCH_AND — Atomic bitwise AND operation with prior fetch
    • 9.30 ATOMIC_FETCH_OR — Atomic bitwise OR operation with prior fetch
    • 9.31 ATOMIC_FETCH_XOR — Atomic bitwise XOR operation with prior fetch
    • 9.32 ATOMIC_OR — Atomic bitwise OR operation
    • 9.33 ATOMIC_REF — Obtaining the value of a variable atomically
    • 9.34 ATOMIC_XOR — Atomic bitwise OR operation
    • 9.35 BACKTRACE — Show a backtrace
    • 9.36 BESSEL_J0 — Bessel function of the first kind of order 0
    • 9.37 BESSEL_J1 — Bessel function of the first kind of order 1
    • 9.38 BESSEL_JN — Bessel function of the first kind
    • 9.39 BESSEL_Y0 — Bessel function of the second kind of order 0
    • 9.40 BESSEL_Y1 — Bessel function of the second kind of order 1
    • 9.41 BESSEL_YN — Bessel function of the second kind
    • 9.42 BGE — Bitwise greater than or equal to
    • 9.43 BGT — Bitwise greater than
    • 9.44 BIT_SIZE — Bit size inquiry function
    • 9.45 BLE — Bitwise less than or equal to
    • 9.46 BLT — Bitwise less than
    • 9.47 BTEST — Bit test function
    • 9.48 C_ASSOCIATED — Status of a C pointer
    • 9.49 C_F_POINTER — Convert C into Fortran pointer
    • 9.50 C_F_PROCPOINTER — Convert C into Fortran procedure pointer
    • 9.51 C_FUNLOC — Obtain the C address of a procedure
    • 9.52 C_LOC — Obtain the C address of an object
    • 9.53 C_SIZEOF — Size in bytes of an expression
    • 9.54 CEILING — Integer ceiling function
    • 9.55 CHAR — Character conversion function
    • 9.56 CHDIR — Change working directory
    • 9.57 CHMOD — Change access permissions of files
    • 9.58 CMPLX — Complex conversion function
    • 9.59 CO_BROADCAST — Copy a value to all images the current set of images
    • 9.60 CO_MAX — Maximal value on the current set of images
    • 9.61 CO_MIN — Minimal value on the current set of images
    • 9.62 CO_REDUCE — Reduction of values on the current set of images
    • 9.63 CO_SUM — Sum of values on the current set of images
    • 9.64 COMMAND_ARGUMENT_COUNT — Get number of command line arguments
    • 9.65 COMPILER_OPTIONS — Options passed to the compiler
    • 9.66 COMPILER_VERSION — Compiler version string
    • 9.67 COMPLEX — Complex conversion function
    • 9.68 CONJG — Complex conjugate function
    • 9.69 COS — Cosine function
    • 9.70 COSH — Hyperbolic cosine function
    • 9.71 COUNT — Count function
    • 9.72 CPU_TIME — CPU elapsed time in seconds
    • 9.73 CSHIFT — Circular shift elements of an array
    • 9.74 CTIME — Convert a time into a string
    • 9.75 DATE_AND_TIME — Date and time subroutine
    • 9.76 DBLE — Double conversion function
    • 9.77 DCMPLX — Double complex conversion function
    • 9.78 DIGITS — Significant binary digits function
    • 9.79 DIM — Positive difference
    • 9.80 DOT_PRODUCT — Dot product function
    • 9.81 DPROD — Double product function
    • 9.82 DREAL — Double real part function
    • 9.83 DSHIFTL — Combined left shift
    • 9.84 DSHIFTR — Combined right shift
    • 9.85 DTIME — Execution time subroutine (or function)
    • 9.86 EOSHIFT — End-off shift elements of an array
    • 9.87 EPSILON — Epsilon function
    • 9.88 ERF — Error function
    • 9.89 ERFC — Error function
    • 9.90 ERFC_SCALED — Error function
    • 9.91 ETIME — Execution time subroutine (or function)
    • 9.92 EVENT_QUERY — Query whether a coarray event has occurred
    • 9.93 EXECUTE_COMMAND_LINE — Execute a shell command
    • 9.94 EXIT — Exit the program with status.
    • 9.95 EXP — Exponential function
    • 9.96 EXPONENT — Exponent function
    • 9.97 EXTENDS_TYPE_OF — Query dynamic type for extension
    • 9.98 FDATE — Get the current time as a string
    • 9.99 FGET — Read a single character in stream mode from stdin
    • 9.100 FGETC — Read a single character in stream mode
    • 9.101 FLOOR — Integer floor function
    • 9.102 FLUSH — Flush I/O unit(s)
    • 9.103 FNUM — File number function
    • 9.104 FPUT — Write a single character in stream mode to stdout
    • 9.105 FPUTC — Write a single character in stream mode
    • 9.106 FRACTION — Fractional part of the model representation
    • 9.107 FREE — Frees memory
    • 9.108 FSEEK — Low level file positioning subroutine
    • 9.109 FSTAT — Get file status
    • 9.110 FTELL — Current stream position
    • 9.111 GAMMA — Gamma function
    • 9.112 GERROR — Get last system error message
    • 9.113 GETARG — Get command line arguments
    • 9.114 GET_COMMAND — Get the entire command line
    • 9.115 GET_COMMAND_ARGUMENT — Get command line arguments
    • 9.116 GETCWD — Get current working directory
    • 9.117 GETENV — Get an environmental variable
    • 9.118 GET_ENVIRONMENT_VARIABLE — Get an environmental variable
    • 9.119 GETGID — Group ID function
    • 9.120 GETLOG — Get login name
    • 9.121 GETPID — Process ID function
    • 9.122 GETUID — User ID function
    • 9.123 GMTIME — Convert time to GMT info
    • 9.124 HOSTNM — Get system host name
    • 9.125 HUGE — Largest number of a kind
    • 9.126 HYPOT — Euclidean distance function
    • 9.127 IACHAR — Code in ASCII collating sequence
    • 9.128 IALL — Bitwise AND of array elements
    • 9.129 IAND — Bitwise logical and
    • 9.130 IANY — Bitwise OR of array elements
    • 9.131 IARGC — Get the number of command line arguments
    • 9.132 IBCLR — Clear bit
    • 9.133 IBITS — Bit extraction
    • 9.134 IBSET — Set bit
    • 9.135 ICHAR — Character-to-integer conversion function
    • 9.136 IDATE — Get current local time subroutine (day/month/year)
    • 9.137 IEOR — Bitwise logical exclusive or
    • 9.138 IERRNO — Get the last system error number
    • 9.139 IMAGE_INDEX — Function that converts a cosubscript to an image index
    • 9.140 INDEX — Position of a substring within a string
    • 9.141 INT — Convert to integer type
    • 9.142 INT2 — Convert to 16-bit integer type
    • 9.143 INT8 — Convert to 64-bit integer type
    • 9.144 IOR — Bitwise logical or
    • 9.145 IPARITY — Bitwise XOR of array elements
    • 9.146 IRAND — Integer pseudo-random number
    • 9.147 IS_IOSTAT_END — Test for end-of-file value
    • 9.148 IS_IOSTAT_EOR — Test for end-of-record value
    • 9.149 ISATTY — Whether a unit is a terminal device.
    • 9.150 ISHFT — Shift bits
    • 9.151 ISHFTC — Shift bits circularly
    • 9.152 ISNAN — Test for a NaN
    • 9.153 ITIME — Get current local time subroutine (hour/minutes/seconds)
    • 9.154 KILL — Send a signal to a process
    • 9.155 KIND — Kind of an entity
    • 9.156 LBOUND — Lower dimension bounds of an array
    • 9.157 LCOBOUND — Lower codimension bounds of an array
    • 9.158 LEADZ — Number of leading zero bits of an integer
    • 9.159 LEN — Length of a character entity
    • 9.160 LEN_TRIM — Length of a character entity without trailing blank characters
    • 9.161 LGE — Lexical greater than or equal
    • 9.162 LGT — Lexical greater than
    • 9.163 LINK — Create a hard link
    • 9.164 LLE — Lexical less than or equal
    • 9.165 LLT — Lexical less than
    • 9.166 LNBLNK — Index of the last non-blank character in a string
    • 9.167 LOC — Returns the address of a variable
    • 9.168 LOG — Natural logarithm function
    • 9.169 LOG10 — Base 10 logarithm function
    • 9.170 LOG_GAMMA — Logarithm of the Gamma function
    • 9.171 LOGICAL — Convert to logical type
    • 9.172 LONG — Convert to integer type
    • 9.173 LSHIFT — Left shift bits
    • 9.174 LSTAT — Get file status
    • 9.175 LTIME — Convert time to local time info
    • 9.176 MALLOC — Allocate dynamic memory
    • 9.177 MASKL — Left justified mask
    • 9.178 MASKR — Right justified mask
    • 9.179 MATMUL — matrix multiplication
    • 9.180 MAX — Maximum value of an argument list
    • 9.181 MAXEXPONENT — Maximum exponent of a real kind
    • 9.182 MAXLOC — Location of the maximum value within an array
    • 9.183 MAXVAL — Maximum value of an array
    • 9.184 MCLOCK — Time function
    • 9.185 MCLOCK8 — Time function (64-bit)
    • 9.186 MERGE — Merge variables
    • 9.187 MERGE_BITS — Merge of bits under mask
    • 9.188 MIN — Minimum value of an argument list
    • 9.189 MINEXPONENT — Minimum exponent of a real kind
    • 9.190 MINLOC — Location of the minimum value within an array
    • 9.191 MINVAL — Minimum value of an array
    • 9.192 MOD — Remainder function
    • 9.193 MODULO — Modulo function
    • 9.194 MOVE_ALLOC — Move allocation from one object to another
    • 9.195 MVBITS — Move bits from one integer to another
    • 9.196 NEAREST — Nearest representable number
    • 9.197 NEW_LINE — New line character
    • 9.198 NINT — Nearest whole number
    • 9.199 NORM2 — Euclidean vector norms
    • 9.200 NOT — Logical negation
    • 9.201 NULL — Function that returns an disassociated pointer
    • 9.202 NUM_IMAGES — Function that returns the number of images
    • 9.203 OR — Bitwise logical OR
    • 9.204 PACK — Pack an array into an array of rank one
    • 9.205 PARITY — Reduction with exclusive OR
    • 9.206 PERROR — Print system error message
    • 9.207 POPCNT — Number of bits set
    • 9.208 POPPAR — Parity of the number of bits set
    • 9.209 PRECISION — Decimal precision of a real kind
    • 9.210 PRESENT — Determine whether an optional dummy argument is specified
    • 9.211 PRODUCT — Product of array elements
    • 9.212 RADIX — Base of a model number
    • 9.213 RAN — Real pseudo-random number
    • 9.214 RAND — Real pseudo-random number
    • 9.215 RANDOM_NUMBER — Pseudo-random number
    • 9.216 RANDOM_SEED — Initialize a pseudo-random number sequence
    • 9.217 RANGE — Decimal exponent range
    • 9.218 RANK — Rank of a data object
    • 9.219 REAL — Convert to real type
    • 9.220 RENAME — Rename a file
    • 9.221 REPEAT — Repeated string concatenation
    • 9.222 RESHAPE — Function to reshape an array
    • 9.223 RRSPACING — Reciprocal of the relative spacing
    • 9.224 RSHIFT — Right shift bits
    • 9.225 SAME_TYPE_AS — Query dynamic types for equality
    • 9.226 SCALE — Scale a real value
    • 9.227 SCAN — Scan a string for the presence of a set of characters
    • 9.228 SECNDS — Time function
    • 9.229 SECOND — CPU time function
    • 9.230 SELECTED_CHAR_KIND — Choose character kind
    • 9.231 SELECTED_INT_KIND — Choose integer kind
    • 9.232 SELECTED_REAL_KIND — Choose real kind
    • 9.233 SET_EXPONENT — Set the exponent of the model
    • 9.234 SHAPE — Determine the shape of an array
    • 9.235 SHIFTA — Right shift with fill
    • 9.236 SHIFTL — Left shift
    • 9.237 SHIFTR — Right shift
    • 9.238 SIGN — Sign copying function
    • 9.239 SIGNAL — Signal handling subroutine (or function)
    • 9.240 SIN — Sine function
    • 9.241 SINH — Hyperbolic sine function
    • 9.242 SIZE — Determine the size of an array
    • 9.243 SIZEOF — Size in bytes of an expression
    • 9.244 SLEEP — Sleep for the specified number of seconds
    • 9.245 SPACING — Smallest distance between two numbers of a given type
    • 9.246 SPREAD — Add a dimension to an array
    • 9.247 SQRT — Square-root function
    • 9.248 SRAND — Reinitialize the random number generator
    • 9.249 STAT — Get file status
    • 9.250 STORAGE_SIZE — Storage size in bits
    • 9.251 SUM — Sum of array elements
    • 9.252 SYMLNK — Create a symbolic link
    • 9.253 SYSTEM — Execute a shell command
    • 9.254 SYSTEM_CLOCK — Time function
    • 9.255 TAN — Tangent function
    • 9.256 TANH — Hyperbolic tangent function
    • 9.257 THIS_IMAGE — Function that returns the cosubscript index of this image
    • 9.258 TIME — Time function
    • 9.259 TIME8 — Time function (64-bit)
    • 9.260 TINY — Smallest positive number of a real kind
    • 9.261 TRAILZ — Number of trailing zero bits of an integer
    • 9.262 TRANSFER — Transfer bit patterns
    • 9.263 TRANSPOSE — Transpose an array of rank two
    • 9.264 TRIM — Remove trailing blank characters of a string
    • 9.265 TTYNAM — Get the name of a terminal device.
    • 9.266 UBOUND — Upper dimension bounds of an array
    • 9.267 UCOBOUND — Upper codimension bounds of an array
    • 9.268 UMASK — Set the file creation mask
    • 9.269 UNLINK — Remove a file from the file system
    • 9.270 UNPACK — Unpack an array of rank one into an array
    • 9.271 VERIFY — Scan a string for characters not a given set
    • 9.272 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 2003 and 2008 status: Fortran 2003 and 2008 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

Next: Introduction, Up: (dir) [Contents][Index]

© Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-6.4.0/gfortran/index.html

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