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gfortran.texi: Document environment variables which influence runtime behavior. 

2006-02-19  Thomas Koenig  <Thomas.Koenig@online.de>

        * gfortran.texi:  Document environment variables which
        influence runtime behavior.

From-SVN: r111280
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gcc/fortran/ChangeLog
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@ -1,3 +1,8 @@
2006-02-19 Thomas Koenig <Thomas.Koenig@online.de>
* gfortran.texi: Document environment variables which
influence runtime behavior.
2006-02-19 H.J. Lu <hongjiu.lu@intel.com>
* resolve.c (resolve_contained_functions): Call resolve_entries

105
gcc/fortran/gfortran.texi
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@ -550,16 +550,113 @@ Environment variable forcing standard output to be line buffered (unix).
The behaviour of the @command{gfortran} can be influenced by
environment variables.
Malformed environment variables are silently ignored.
@menu
* GFORTRAN_STDIN_UNIT:: Unit number for standard input
* GFORTRAN_STDOUT_UNIT:: Unit number for standard output
* GFORTRAN_STDERR_UNIT:: Unit number for standard error
* GFORTRAN_USE_STDERR:: Send library output to standard error
* GFORTRAN_TMPDIR:: Directory for scratch files
* GFORTRAN_UNBUFFERED_ALL:: Don't buffer output
* GFORTRAN_SHOW_LOCUS:: Show location for runtime errors
* GFORTRAN_OPTIONAL_PLUS:: Print leading + where permitted
* GFORTRAN_DEFAULT_RECL:: Default record length for new files
* GFORTRAN_LIST_SEPARATOR:: Separator for list output
* GFORTRAN_CONVERT_UNIT:: Set endianness for unformatted I/O
@end menu
@node GFORTRAN_CONVERT_UNIT
@section GFORTRAN_CONVERT_UNIT --- Set endianness for unformatted I/O
@node GFORTRAN_STDIN_UNIT
@section @env{GFORTRAN_STDIN_UNIT}---Unit number for standard input
By setting the @code{GFORTRAN_CONVERT_UNIT variable}, it is possible
This environment variable can be used to select the unit number
preconnected to standard input. This must be a positive integer.
The default value is 5.
@node GFORTRAN_STDOUT_UNIT
@section @env{GFORTRAN_STDOUT_UNIT}---Unit number for standard output
This environment variable can be used to select the unit number
preconnected to standard output. This must be a positive integer.
The default value is 6.
@node GFORTRAN_STDERR_UNIT
@section @env{GFORTRAN_STDERR_UNIT}---Unit number for standard error
This environment variable can be used to select the unit number
preconnected to standard error. This must be a positive integer.
The default value is 0.
@node GFORTRAN_USE_STDERR
@section @env{GFORTRAN_USE_STDERR}---Send library output to standard error
This environment variable controls where library output is sent.
If the first letter is @samp{y}, @samp{Y} or @samp{1}, standard
error is used. If the first letter is @samp{n}, @samp{N} or
@samp{0}, standard output is used.
@node GFORTRAN_TMPDIR
@section @env{GFORTRAN_TMPDIR}---Directory for scratch files
This environment variable controls where scratch files are
created. If this environment variable is missing,
gfortran searches for the environment variable @env{TMP}. If
this is also missing, the default is @file{/tmp}.
@node GFORTRAN_UNBUFFERED_ALL
@section @env{GFORTRAN_UNBUFFERED_ALL}---Don't buffer output
This environment variable controls wether all output is unbuffered.
If the first letter is @samp{y}, @samp{Y} or @samp{1}, all output is
unbuffered. This will slow down large writes. If the first letter is
@samp{n}, @samp{N} or @samp{0}, output is bufferred. This is the
default.
@node GFORTRAN_SHOW_LOCUS
@section @env{GFORTRAN_SHOW_LOCUS}---Show location for runtime errors
If the first letter is @samp{y}, @samp{Y} or @samp{1}, filename and
line numbers for runtime errors are printed. If the first letter is
@samp{n}, @samp{N} or @samp{0}, don't print filename and line numbers
for runtime errors. The default is to print the location.
@node GFORTRAN_OPTIONAL_PLUS
@section @env{GFORTRAN_OPTIONAL_PLUS}---Print leading + where permitted
If the first letter is @samp{y}, @samp{Y} or @samp{1},
a plus sign is printed
where permitted by the Fortran standard. If the first lettter
is @samp{n}, @samp{N} or @samp{0}, a plus sign is not printed
in most cases. Default is not to print plus signs.
@node GFORTRAN_DEFAULT_RECL
@section @env{GFORTRAN_DEFAULT_RECL}---Default record length for new files
This environment variable specifies the default record length for
files which are opened without a @code{RECL} tag in the @code{OPEN}
statement. This must be a positive integer. The default value is
1073741824.
@node GFORTRAN_LIST_SEPARATOR
@section @env{GFORTRAN_LIST_SEPARATOR}---Separator for list output
This environment variable specifies the separator when writing
list-directed output. It may contain any number of spaces and
at most one comma. If you specify this on the command line,
be sure to quote spaces, as in
@smallexample
$ GFORTRAN_LIST_SEPARATOR=' , ' ./a.out
@end smallexample
when @code{a.out} is the gfortran program that you want to run.
Default is a single space.
@node GFORTRAN_CONVERT_UNIT
@section @env{GFORTRAN_CONVERT_UNIT}---Set endianness for unformatted I/O
By setting the @env{GFORTRAN_CONVERT_UNIT} variable, it is possible
to change the representation of data for unformatted files.
The syntax for the @code{GFORTRAN_CONVERT_UNIT} variable is:
The syntax for the @env{GFORTRAN_CONVERT_UNIT} variable is:
@smallexample
GFORTRAN_CONVERT_UNIT: mode | mode ';' exception ;
mode: 'native' | 'swap' | 'big_endian' | 'little_endian' ;