366 lines
9.2 KiB
Plaintext
366 lines
9.2 KiB
Plaintext
.\" Copyright (c) 1995-1997 Free Software Foundation -*-Text-*-
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.\" See section COPYING for conditions for redistribution
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.\" FIXME: no info here on predefines. Should there be? extra for F77...
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.TH G77 1 "1999-02-14" "GNU Tools" "GNU Tools"
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.de BP
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.sp
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.ti \-.2i
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\(**
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..
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.SH NAME
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g77 \- GNU project Fortran Compiler (v0.5.24)
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.SH SYNOPSIS
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.RB g77 " [" \c
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.IR option " | " "filename " ].\|.\|.
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.SH WARNING
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The information in this man page is an extract from the full
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documentation of the GNU Fortran compiler (version 0.5.24),
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and is limited to the meaning of some of the options.
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.PP
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This man page is not up to date, since no volunteers want to
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maintain it. If you find a discrepancy between the man page and the
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software, please check the Info file, which is the authoritative
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documentation.
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.\" .PP
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.\" The version of GNU Fortran documented by the Info file is 0.5.24,
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.\" which includes substantial improvements and changes since 0.5.24,
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.\" the version documented in this man page.
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.PP
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If we find that the things in this man page that are out of date cause
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significant confusion or complaints, we will stop distributing the man
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page. The alternative, updating the man page when we update the Info
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file, is impractical because the rest of the work of maintaining GNU Fortran
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leaves us no time for that. The GNU project regards man pages as
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obsolete and should not let them take time away from other things.
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.PP
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For complete and current documentation, refer to the Info file `\|\c
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.B g77\c
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\&\|' or the manual
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.I
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Using and Porting GNU Fortran (for version 0.5.24)\c
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\&. Both are made from the Texinfo source file
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.BR g77.texi .
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.PP
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If your system has the `\|\c
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.B info\c
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\&\|' command installed, the command `\|\c
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.B info g77\c
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\&\|' should work, unless
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.B g77
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has not been properly installed.
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If your system lacks `\|\c
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.B info\c
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\&\|', or you wish to avoid using it for now,
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the command `\|\c
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.B more /usr/info/g77.info*\c
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\&\|' should work, unless
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.B g77
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has not been properly installed.
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.PP
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If
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.B g77
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has not been properly installed, so that you
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cannot easily access the Info file for it,
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ask your system administrator, or the installer
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of
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.B g77
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(if you know who that is) to fix the problem.
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.SH DESCRIPTION
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The C and F77 compilers are integrated;
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.B g77
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is a program to call
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.B gcc
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with options to recognize programs written in Fortran (ANSI FORTRAN 77,
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also called F77).
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.B gcc
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processes input files
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through one or more of four stages: preprocessing, compilation,
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assembly, and linking. This man page contains full descriptions for
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.I only
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F77-specific aspects of the compiler, though it also contains
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summaries of some general-purpose options. For a fuller explanation
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of the compiler, see
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.BR gcc ( 1 ).
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For complete documentation on GNU Fortran, type `\|\c
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.B info g77\c
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\&\|'.
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F77 source files use the suffix `\|\c
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.B .f\c
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\&\|', `\|\c
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.B .for\c
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\&\|', or `\|\c
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.B .FOR\c
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\&\|'; F77 files to be preprocessed by
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.BR cpp ( 1 )
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use the suffix `\|\c
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.B .F\c
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\&\|', `\|\c
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.B .fpp\c
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\&\|', or `\|\c
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.B .FPP\c
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\&\|'; Ratfor source files use the suffix `\|\c
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.B .r\c
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\&\|' (though
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.B ratfor
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itself is not supplied as part of
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.B g77\c
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\&).
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.SH OPTIONS
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There are many command-line options, including options to control
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details of optimization, warnings, and code generation, which are
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common to both
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.B gcc
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and
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.B g77\c
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\&. For full information on all options, see
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.BR gcc ( 1 ).
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Options must be separate: `\|\c
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.B \-dr\c
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\&\|' is quite different from `\|\c
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.B \-d \-r
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\&\|'.
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Most `\|\c
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.B \-f\c
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\&\|' and `\|\c
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.B \-W\c
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\&\|' options have two contrary forms:
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.BI \-f name
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and
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.BI \-fno\- name\c
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\& (or
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.BI \-W name
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and
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.BI \-Wno\- name\c
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\&). Only the non-default forms are shown here.
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.TP
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.B \-c
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Compile or assemble the source files, but do not link. The compiler
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output is an object file corresponding to each source file.
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.TP
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.BI \-D macro
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Define macro \c
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.I macro\c
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\& with the string `\|\c
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.B 1\c
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\&\|' as its definition.
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.TP
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.BI \-D macro = defn
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Define macro \c
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.I macro\c
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\& as \c
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.I defn\c
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\&.
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.TP
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.B \-E
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Stop after the preprocessing stage; do not run the compiler proper. The
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output is preprocessed source code, which is sent to the
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standard output.
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.TP
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.B \-g
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Produce debugging information in the operating system's native format
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(for DBX or SDB or DWARF). GDB also can work with this debugging
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information. On most systems that use DBX format, `\|\c
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.B \-g\c
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\&\|' enables use
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of extra debugging information that only GDB can use.
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Unlike most other Fortran compilers, GNU Fortran allows you to use `\|\c
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.B \-g\c
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\&\|' with
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`\|\c
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.B \-O\c
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\&\|'. The shortcuts taken by optimized code may occasionally
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produce surprising results: some variables you declared may not exist
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at all; flow of control may briefly move where you did not expect it;
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some statements may not be executed because they compute constant
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results or their values were already at hand; some statements may
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execute in different places because they were moved out of loops.
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Nevertheless it proves possible to debug optimized output. This makes
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it reasonable to use the optimizer for programs that might have bugs.
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.TP
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.BI "\-I" "dir"\c
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\&
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Append directory \c
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.I dir\c
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\& to the list of directories searched for include files.
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.TP
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.BI "\-L" "dir"\c
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\&
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Add directory \c
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.I dir\c
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\& to the list of directories to be searched
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for `\|\c
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.B \-l\c
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\&\|'.
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.TP
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.BI \-l library\c
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\&
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Use the library named \c
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.I library\c
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\& when linking.
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.TP
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.B \-nostdinc
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Do not search the standard system directories for header files. Only
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the directories you have specified with
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.B \-I
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options (and the current directory, if appropriate) are searched.
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.TP
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.B \-O
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Optimize. Optimizing compilation takes somewhat more time, and a lot
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more memory for a large function. See the GCC documentation for
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further optimisation options. Loop unrolling, in particular, may be
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worth investigating for typical numerical Fortran programs.
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.TP
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.BI "\-o " file\c
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\&
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Place output in file \c
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.I file\c
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\&.
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.TP
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.B \-S
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Stop after the stage of compilation proper; do not assemble. The output
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is an assembler code file for each non-assembler input
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file specified.
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.TP
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.BI \-U macro
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Undefine macro \c
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.I macro\c
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\&.
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.TP
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.B \-v
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Print (on standard error output) the commands executed to run the
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stages of compilation. Also print the version number of the compiler
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driver program and of the preprocessor and the compiler proper. The
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version numbers of g77 itself and the GCC distribution on which it is
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based are distinct.
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.TP
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.B \-Wall
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Issue warnings for conditions which pertain to usage that we recommend
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avoiding and that we believe is easy to avoid, even in conjunction
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with macros.
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.PP
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.SH FILES
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.ta \w'LIBDIR/g77\-include 'u
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file.h C header (preprocessor) file
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.br
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file.f Fortran source file
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.br
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file.for Fortran source file
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.br
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file.FOR Fortran source file
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.br
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file.F preprocessed Fortran source file
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.br
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file.fpp preprocessed Fortran source file
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.br
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file.FPP preprocessed Fortran source file
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.br
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file.r Ratfor source file (ratfor not included)
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.br
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file.s assembly language file
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.br
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file.o object file
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.br
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a.out link edited output
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.br
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\fITMPDIR\fR/cc\(** temporary files
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.br
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\fILIBDIR\fR/cpp preprocessor
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.br
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\fILIBDIR\fR/f771 compiler
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.br
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\fILIBDIR\fR/libg2c.a Fortran run-time library
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.br
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\fILIBDIR\fR/libgcc.a GCC subroutine library
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.br
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/lib/crt[01n].o start-up routine
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.br
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/lib/libc.a standard C library, see
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.IR intro (3)
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.br
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/usr/include standard directory for
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.B #include
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files
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.br
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\fILIBDIR\fR/include standard gcc directory for
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.B #include
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.br
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files.
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.sp
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.I LIBDIR
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is usually
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.B /usr/local/lib/\c
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.IR machine / version .
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.sp
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.I TMPDIR
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comes from the environment variable
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.B TMPDIR
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(default
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.B /usr/tmp
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if available, else
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.B /tmp\c
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\&).
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.SH "SEE ALSO"
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gcc(1), cpp(1), as(1), ld(1), gdb(1), adb(1), dbx(1), sdb(1).
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.br
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.RB "`\|" g77 "\|', `\|" gcc "\|', `\|" cpp "\|',"
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.RB "`\|" as "\|', `\|" ld "\|',"
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and
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.RB "`\|" gdb "\|'"
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entries in
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.B info\c
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\&.
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.br
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.I
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Using and Porting GNU Fortran (for version 0.5.24)\c
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, James Craig Burley;
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.I
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Using and Porting GNU CC (for version 2.0)\c
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, Richard M. Stallman;
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.I
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The C Preprocessor\c
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, Richard M. Stallman;
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.I
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Debugging with GDB: the GNU Source-Level Debugger\c
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, Richard M. Stallman and Roland H. Pesch;
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.I
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Using as: the GNU Assembler\c
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, Dean Elsner, Jay Fenlason & friends;
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.I
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gld: the GNU linker\c
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, Steve Chamberlain and Roland Pesch.
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.SH BUGS
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For instructions on how to report bugs, type `\|\c
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.B info g77 -n Bugs\c
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\&\|'.
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.SH COPYING
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Copyright (c) 1991-1998 Free Software Foundation, Inc.
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.PP
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Permission is granted to make and distribute verbatim copies of
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this manual provided the copyright notice and this permission notice
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are preserved on all copies.
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.PP
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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.PP
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Permission is granted to copy and distribute translations of this
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manual into another language, under the above conditions for modified
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versions, except that this permission notice may be included in
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translations approved by the Free Software Foundation instead of in
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the original English.
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.SH AUTHORS
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See the GNU CC Manual for the contributors to GNU CC.
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See the GNU Fortran Manual for the contributors to
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GNU Fortran.
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