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* gfortran.texi: Document some more GNU extensions.

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From-SVN: r100074
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Roger Sayle 2005-05-23 03:20:19 +00:00 committed by Roger Sayle
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4
gcc/fortran/ChangeLog
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@ -1,3 +1,7 @@
2005-05-22 Roger Sayle <roger@eyesopen.com>
* gfortran.texi: Document some more GNU extensions.
2005-05-22 Francois-Xavier Coudert <coudert@clipper.ens.fr>
* error.c (gfc_warning): Fix typo in comment.

66
gcc/fortran/gfortran.texi
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@ -624,6 +624,12 @@ meaning.
* Old-style kind specifications::
* Old-style variable initialization::
* Extensions to namelist::
* X format descriptor::
* Commas in FORMAT specifications::
* I/O item lists::
* Hexadecimal constants::
* Real array indices::
* Unary operators::
@end menu
@node Old-style kind specifications
@ -720,6 +726,66 @@ had been called:
To aid this dialog, when input is from stdin, errors produce send their
messages to stderr and execution continues, even if IOSTAT is set.
@node X format descriptor
@section X format descriptor
@cindex X format descriptor
To support legacy codes, @command{gfortran} permits the count field
of the X edit descriptor in FORMAT statements to be omitted. When
omitted, the count is implicitly assumed to be one.
@smallexample
PRINT 10, 2, 3
10 FORMAT (I1, X, I1)
@end smallexample
@node Commas in FORMAT specifications
@section Commas in FORMAT specifications
@cindex Commas in FORMAT specifications
To support legacy codes, @command{gfortran} allows the comma separator
to be omitted immediately before and after character string edit
descriptors in FORMAT statements.
@smallexample
PRINT 10, 2, 3
10 FORMAT ('FOO='I1' BAR='I2)
@end smallexample
@node I/O item lists
@section I/O item lists
@cindex I/O item lists
To support legacy codes, @command{gfortran} allows the input item list
of the READ statement, and the output item lists of the WRITE and PRINT
statements to start with a comma.
@node Hexadecimal constants
@section Hexadecimal constants
@cindex Hexadecimal constants
As a GNU extension, @command{gfortran} allows hexadecimal constants to
be specified using the X prefix, in addition to the standard Z prefix.
@node Real array indices
@section Real array indices
@cindex Real array indices
As a GNU extension, @command{gfortran} allows arrays to be indexed using
real types, whose values are implicitly converted to integers.
@node Unary operators
@section Unary operators
@cindex Unary operators
As a GNU extension, @command{gfortran} allows unary plus and unary
minus operators to appear as the second operand of binary arithmetic
operators without the need for parenthesis.
@smallexample
X = Y * -Z
@end smallexample
@include intrinsic.texi
@c ---------------------------------------------------------------------
@c Contributing