@c %**start of header
@setfilename g77.info
-@set last-update 1999-06-06
-@set copyrights-g77 1995-1999
+@set last-update 2000-11-27
+@set copyrights-g77 1995,1996,1997,1998,1999,2000
@include root.texi
@smallexample
@var{one line to give the program's name and a brief idea of what it does.}
-Copyright (C) 19@var{yy} @var{name of author}
+Copyright (C) @var{year} @var{name of author}
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
when it starts in an interactive mode:
@smallexample
-Gnomovision version 69, Copyright (C) 19@var{yy} @var{name of author}
+Gnomovision version 69, Copyright (C) @var{year} @var{name of author}
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w'.
This is free software, and you are welcome to redistribute it
experimental, options added by @code{g77} to the @code{gcc}
compiler and its back end.
-(These, in turn, have made their way into the @code{egcs}
+(These, in turn, had made their way into the @code{egcs}
version of the compiler, and do not exist in @code{gcc}
version 2.8 or versions of @code{g77} based on that version
of @code{gcc}.)
@cindex options, -fset-g77-defaults
@item -fset-g77-defaults
@emph{Version info:}
-This option is obsolete in @code{egcs}
-as of version 1.1.
+This option was obsolete as of @code{egcs}
+version 1.1.
The effect is instead achieved
by the @code{lang_init_options} routine
-in @file{egcs/gcc/f/com.c}.
+in @file{gcc/gcc/f/com.c}.
@cindex consistency checks
@cindex internal consistency checks
were withdrawn as of @code{g77} version 0.5.23
due to their not being supported by @code{gcc} version 2.8.
-These options, which control the assumptions regarding aliasing
+These options control the assumptions regarding aliasing
(overlapping) of writes and reads to main memory (core) made
-by the @code{gcc} back end,
-might well be added back (in some form) in a future version
-of @code{gcc}.
-
-However, these options @emph{are} supported by @code{egcs}.
+by the @code{gcc} back end.
The information below still is useful, but applies to
only those versions of @code{g77} that support the
and m68k GNU systems you can do this with a technique similar to that
for turning on floating-point exceptions
(@pxref{Floating-point Exception Handling}).
-The control word could be set to double precision by
-replacing the @code{__setfpucw} call with one like this:
+The control word could be set to double precision by some code like this
+one:
@smallexample
- __setfpucw ((_FPU_DEFAULT & ~_FPU_EXTENDED) | _FPU_DOUBLE);
+#include <fpu_control.h>
+@{
+ fpu_control_t cw = (_FPU_DEFAULT & ~_FPU_EXTENDED) | _FPU_DOUBLE;
+ _FPU_SETCW(cw);
+@}
@end smallexample
(It is not clear whether this has any effect on the operation of the GNU
maths library, but we have no evidence of it causing trouble.)
be invoked at startup using @code{gcc}'s @code{constructor} attribute.
For example, just compiling and linking the following C code with your
program will turn on exception trapping for the ``common'' exceptions
-on an x86-based GNU system:
+on a GNU system using glibc 2.2 or newer:
@smallexample
-#include <fpu_control.h>
+#define _GNU_SOURCE 1
+#include <fenv.h>
static void __attribute__ ((constructor))
trapfpe ()
@{
- __setfpucw (_FPU_DEFAULT &
- ~(_FPU_MASK_IM | _FPU_MASK_ZM | _FPU_MASK_OM));
+ /* Enable some exceptions. At startup all exceptions are masked. */
+
+ feenableexcept (FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW);
@}
@end smallexample
@table @code
@item G77 0.5.24 (EGCS 1.1)
-@itemx G77 0.5.25 (EGCS 1.2)
-Change the @code{lang_init_options} routine in @file{egcs/gcc/f/com.c}.
+@itemx G77 0.5.25 (EGCS 1.2 - which became GCC 2.95)
+Change the @code{lang_init_options} routine in @file{gcc/gcc/f/com.c}.
(Note that these versions of @code{g77}
perform internal consistency checking automatically
this problem,
which occurs only in releases of @code{g77}
based on @code{gcc}.
-(It does not occur in @code{egcs}.)
+(It did not occur in @code{egcs}.)
On AIX 4.1, @code{g77} might not build with the native (non-GNU) tools
due to a linker bug in coping with the @samp{-bbigtoc} option which
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