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gfortran.h (GFC_STD_LEGACY): New "standard" macro.

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* gfortran.h (GFC_STD_LEGACY): New "standard" macro.  Reindent.
	* options.c (gfc_init_options): By default, allow legacy extensions
	but warn about them.
	(gfc_post_options): Make -pedantic warn about legacy extensions
	even with -std=legacy.
	(gfc_handle_option): Make -std=gnu follow the default behaviour
	of warning about legacy extensions, but allowing them. Make the
	new -std=legacy accept everything and warn about nothing.
	* lang.opt (std=legacy): New F95 command line option.
	* invoke.texi: Document both -std=f2003 and -std=legacy.
	* gfortran.texi: Explain the two types of extensions and document
	how they are affected by the various -std= command line options.

From-SVN: r100377
This commit is contained in:
Roger Sayle 2005-05-30 22:16:08 +00:00 committed by Roger Sayle
parent d5c405cc71
commit c0309c74ca
6 changed files with 51 additions and 12 deletions
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15
gcc/fortran/ChangeLog
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@ -1,3 +1,18 @@
2005-05-30 Roger Sayle <roger@eyesopen.com>
* gfortran.h (GFC_STD_LEGACY): New "standard" macro. Reindent.
* options.c (gfc_init_options): By default, allow legacy extensions
but warn about them.
(gfc_post_options): Make -pedantic warn about legacy extensions
even with -std=legacy.
(gfc_handle_option): Make -std=gnu follow the default behaviour
of warning about legacy extensions, but allowing them. Make the
new -std=legacy accept everything and warn about nothing.
* lang.opt (std=legacy): New F95 command line option.
* invoke.texi: Document both -std=f2003 and -std=legacy.
* gfortran.texi: Explain the two types of extensions and document
how they are affected by the various -std= command line options.
2005-05-30 Kazu Hirata <kazu@cs.umass.edu>
* trans-expr.c: Remove trailing ^M.

13
gcc/fortran/gfortran.h
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@ -92,13 +92,14 @@ mstring;
/* Flags to specify which standard/extension contains a feature. */
#define GFC_STD_GNU (1<<5) /* GNU Fortran extension. */
#define GFC_STD_F2003 (1<<4) /* New in F2003. */
#define GFC_STD_LEGACY (1<<6) /* Backward compatibility. */
#define GFC_STD_GNU (1<<5) /* GNU Fortran extension. */
#define GFC_STD_F2003 (1<<4) /* New in F2003. */
/* Note that no features were obsoleted nor deleted in F2003. */
#define GFC_STD_F95 (1<<3) /* New in F95. */
#define GFC_STD_F95_DEL (1<<2) /* Deleted in F95. */
#define GFC_STD_F95_OBS (1<<1) /* Obsoleted in F95. */
#define GFC_STD_F77 (1<<0) /* Up to and including F77. */
#define GFC_STD_F95 (1<<3) /* New in F95. */
#define GFC_STD_F95_DEL (1<<2) /* Deleted in F95. */
#define GFC_STD_F95_OBS (1<<1) /* Obsoleted in F95. */
#define GFC_STD_F77 (1<<0) /* Up to and including F77. */
/*************************** Enums *****************************/

9
gcc/fortran/gfortran.texi
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@ -618,7 +618,14 @@ Variable for swapping Endianness during unformatted write.
@command{gfortran} implements a number of extensions over standard
Fortran. This chapter contains information on their syntax and
meaning.
meaning. There are currently two categories of @command{gfortran}
extensions, those that provide functionality beyond that provided
by any standard, and those that are supported by @command{gfortran}
purely for backward compatibility with legacy compilers. By default,
@option{-std=gnu} allows the compiler to accept both types of
extensions, but to warn about the use of the latter. Specifying
either @option{-std=f95} or @option{-std=f2003} disables both types
of extensions, and @option{-std=legacy} allows both without warning.
@menu
* Old-style kind specifications::

2
gcc/fortran/invoke.texi
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@ -248,7 +248,7 @@ Specify that no implicit typing is allowed, unless overridden by explicit
@cindex option, -std=@var{std}
@item -std=@var{std}
Conform to the specified standard. Allowed values for @var{std} are
@samp{gnu} and @samp{f95}.
@samp{gnu}, @samp{f95}, @samp{f2003} and @samp{legacy}.
@end table

4
gcc/fortran/lang.opt
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@ -161,4 +161,8 @@ std=gnu
F95
Conform nothing in particular.
std=legacy
F95
Accept extensions to support legacy code.
; This comment is to ensure we retain the blank line above.

20
gcc/fortran/options.c
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@ -77,9 +77,10 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
flag_errno_math = 0;
gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
| GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU;
| GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU
| GFC_STD_LEGACY;
gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
| GFC_STD_F2003;
| GFC_STD_F2003 | GFC_STD_LEGACY;
gfc_option.warn_nonstd_intrinsics = 0;
@ -113,6 +114,9 @@ gfc_post_options (const char **pfilename)
/* If -pedantic, warn about the use of GNU extensions. */
if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
gfc_option.warn_std |= GFC_STD_GNU;
/* -std=legacy -pedantic is effectively -std=gnu. */
if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
/* If the user didn't explicitly specify -f(no)-second-underscore we
use it if we're trying to be compatible with f2c, and not
@ -333,8 +337,16 @@ gfc_handle_option (size_t scode, const char *arg, int value)
case OPT_std_gnu:
gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
| GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
| GFC_STD_GNU;
gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL;
| GFC_STD_GNU | GFC_STD_LEGACY;
gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
| GFC_STD_LEGACY;
break;
case OPT_std_legacy:
gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
| GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
| GFC_STD_GNU | GFC_STD_LEGACY;
gfc_option.warn_std = 0;
break;
case OPT_Wnonstd_intrinsics: