f77(1)

NAME

f77 − Fortran 77 compiler

SYNTAX

f77 [ option ] ... file ...

DESCRIPTION

The f77 command runs the ULTRIX Fortran 77 compiler.

ARGUMENTS

The f77 command accepts several types of file arguments:

Arguments whose names end with ‘.f’ are taken to be Fortran 77 source programs; they are compiled, and each object program is left on the file in the current directory whose name is that of the source with ‘.o’ substituted for ’.f’.

Arguments whose names end with ‘.F’ are also taken to be Fortran 77 source programs; these are first processed by the C preprocessor before being compiled by f77.

Arguments whose names end with ‘.r’ or ‘.e’ are taken to be Ratfor or EFL source programs respectively; these are first transformed by the appropriate preprocessor, then compiled by f77.

Arguments whose names end with ‘.c’ or ‘.s’ are taken to be C or assembly source programs and are compiled or assembled, producing a ‘.o’ file.

Other arguments are taken to be: (1) F77-compatible object programs, typically produced by an earlier run, or (2) libraries of F77-compatible routines. These programs, together with the results of any compilations specified, are loaded in the order given to produce an executable program with the name “a.out”.

Programs compiled with f77 produce memory dumps in file core upon abnormal termination if the −g option was specified during loading. If the environment variable f77_dump_flag is set to a value beginning with y or n, dumps for abnormal terminations are respectively forced or suppressed.

OPTIONS

The following options have the same meaning as in cc(1). See ld(1) for load-time options.

−c Suppress loading and produce ‘.o’ files for each source file.

−g Produce additional symbol table information for dbx(1) and pass the −lg flag to ld(1) so that on abnormal terminations, the memory image is written to file core. Incompatible with −O.

−o output
Name the final output file output instead of ‘a.out’.

−p Prepare object files for profiling, see prof(1).

−pg Causes the compiler to produce counting code in the manner of −p, but invokes a run-time recording mechanism that keeps more extensive statistics and produces a gmon.out file at normal termination. An execution profile can then be generated by use of gprof(1).

−w Suppress all warning messages. If the option is ‘−w66’, only Fortran 66 compatibility warnings are suppressed.

−Dname=def

−Dname
Define the name to the C preprocessor, as if by ‘#define’. If no definition is given, the name is defined as "1". (‘.F’ suffix files only).

−Idir ‘#include’ files whose names do not begin with ‘/’ are always sought first in the directory of the file argument, then in directories named in −I options, then in directories on a standard list. (‘.F’ suffix files only).

−O Invoke an object-code optimizer. Incompatible with −g.

−S Compile the named programs, and leave the assembler-language output on corresponding files suffixed ‘.s’. (No ‘.o’ is created.).

The following options are peculiar to f77.

−d Used for debugging the compiler.

−i2 On machines which support short integers, make the default integer constants and variables short. (−i4 is the standard value of this option). All logical quantities will be short.

−q Suppress printing of file names and program unit names during compilation.

−m Apply the M4 preprocessor to each ‘.r’ file before transforming it with the Ratfor or EFL preprocessor.

−onetrip

−1 Compile DO loops that are performed at least once if reached. (Fortran 77 DO loops are not performed at all if the upper limit is smaller than the lower limit.)

−r8 Treat all floating point variables, constants, functions and intrinsics as double precision and all complex quantities as double complex.

−u Make the default type of a variable ‘undefined’ rather than using the default Fortran rules.

−v Print the version number of the compiler, and the name of each pass as it executes.

−C Compile code to check that subscripts are within declared array bounds. For multi-dimensional arrays, only the equivalent linear subscript is checked.

−F Apply the C preprocessor to ‘.F’ files, and the EFL, or Ratfor preprocessors to ‘.e’ and ‘.r’ files, put the result in the file with the suffix changed to ‘.f’, but do not compile.

−Ex Use the string x as an EFL option in processing ‘.e’ files.

−Rx Use the string x as a Ratfor option in processing ‘.r’ files.

−N[qxscn]nnn
Make static tables in the compiler bigger. The compiler will complain if it overflows its tables and suggest you apply one or more of these flags. These flags have the following meanings:

q Maximum number of equivalenced variables. Default is 150.

x Maximum number of external names (common block names, subroutine and function names). Default is 200.

s Maximum number of statement numbers. Default is 401.

c Maximum depth of nesting for control statements (e.g. DO loops). Default is 20.

n Maximum number of identifiers. Default is 1009.

−U Do not convert upper case letters to lower case. The default is to convert Fortran programs to lower case except within character string constants.

RESTRICTIONS

Files longer than about 50,000 lines must be split up to be compiled.

DIAGNOSTICS

The diagnostics produced by f77 itself are intended to be self-explanatory. Occasional messages may be produced by the loader.

FILES

file.[fFresc]Input file
file.oObject file
a.outLoaded output
/usr/lib/f77pass1Compiler
/lib/f1Pass 2
/lib/c2Optional optimizer
/lib/cppC preprocessor
/usr/lib/libF77.aIntrinsic function library
/usr/lib/libI77.aFortran I/O library
/usr/lib/libU77.aULTRIX interface library
/usr/lib/libm.amath library
/lib/libc.aC library, see section 3
/usr/lib/libF77_p.aProfiling intrinsic function library
/usr/lib/libI77_p.aProfiling Fortran I/O library
/usr/lib/libU77_p.aProfiling ULTRIX interface library
/usr/lib/libm_p.aProfiling math library
/usr/lib/libc_p.aProfiling C library, see section 3
mon.outFile produced for analysis by
prof(1)
gmon.outFile produced for analysis by
gprof(1)

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