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gfortran.texi: New chapter about compiler characteristics.

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2009-02-18  Daniel Kraft  <d@domob.eu>

	* gfortran.texi: New chapter about compiler characteristics.
	(Compiler Characteristics): Document KIND type parameters here.

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gcc/fortran/ChangeLog
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@ -1,3 +1,8 @@
2009-02-18 Daniel Kraft <d@domob.eu>
* gfortran.texi: New chapter about compiler characteristics.
(Compiler Characteristics): Document KIND type parameters here.
2009-02-18 Tobias Burnus <burnus@net-b.de>
* intrinsic.texi (MALLOC): Make example more portable.

60
gcc/fortran/gfortran.texi
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@ -181,6 +181,7 @@ Part I: Invoking GNU Fortran
Part II: Language Reference
* Fortran 2003 and 2008 status:: Fortran 2003 and 2008 features supported by GNU Fortran.
* Compiler Characteristics:: KIND type parameters supported.
* Extensions:: Language extensions implemented by GNU Fortran.
* Intrinsic Procedures:: Intrinsic procedures supported by GNU Fortran.
* Intrinsic Modules:: Intrinsic modules supported by GNU Fortran.
@ -905,6 +906,65 @@ support is based on the latest draft, available from
differ from the drafts, no guarantee of backward compatibility can be
made and you should only use it for experimental purposes.
@c ---------------------------------------------------------------------
@c Compiler Characteristics
@c ---------------------------------------------------------------------
@node Compiler Characteristics
@chapter Compiler Characteristics
@c TODO: Formulate this introduction a little more generally once
@c there is more here than KIND type parameters.
This chapter describes certain characteristics of the GNU Fortran compiler,
namely the KIND type parameter values supported.
@menu
* KIND Type Parameters::
@end menu
@node KIND Type Parameters
@section KIND Type Parameters
@cindex kind
The @code{KIND} type parameters supported by GNU Fortran for the primitive
data types are:
@table @code
@item INTEGER
1, 2, 4, 8*, 16*, default: 4 (1)
@item LOGICAL
1, 2, 4, 8*, 16*, default: 4 (1)
@item REAL
4, 8, 10**, 16**, default: 4 (2)
@item COMPLEX
4, 8, 10**, 16**, default: 4 (2)
@item CHARACTER
1, 4, default: 1
@end table
@noindent
* = not available on all systems @*
** = not available on all systems; additionally 10 and 16 are never
available at the same time @*
(1) Unless -fdefault-integer-8 is used @*
(2) Unless -fdefault-real-8 is used
@noindent
The @code{KIND} value matches the storage size in bytes, except for
@code{COMPLEX} where the storage size is twice as much (or both real and
imaginary part are a real value of the given size). It is recommended to use
the @code{SELECT_*_KIND} intrinsics instead of the concrete values.
@c ---------------------------------------------------------------------
@c Extensions
@c ---------------------------------------------------------------------