I noted in the GCC docs (see for example http://gcc.gnu.org/
onlinedocs/gcc/Interoperation.html) that we have the following text
in the section "Known Causes of Trouble with GCC":
On Ultrix, the Fortran compiler expects registers 2 through 5 to be
saved by function calls. However, the C compiler uses conventions
compatible with BSD Unix: registers 2 through 5 may be clobbered by
function calls.
GCC uses the same convention as the Ultrix C compiler. You can use
these options to produce code compatible with the Fortran compiler:
-fcall-saved-r2 -fcall-saved-r3 -fcall-saved-r4 -fcall-
saved-r5
That code was initially committed to gcc/gcc.texi in 1997 (it's now
in gcc/doc/gcc.texi). As there have been a few changes on the
compiler since that time, I wonder if it's still true, and still
useful to have that comment there. As there is no ultrix maintainer
(though it's still listed as a supported platform), I'm CCing the VAX
maintainers: can you comment on the usefulness of this part of the doc?
So, unless someone can raise a reason against it, I'd like to propose
the patch below to remove it. Built and tested on i686-linux (make
info && make html). OK for mainline?
FX
Index: gcc/doc/trouble.texi
===================================================================
--- gcc/doc/trouble.texi (revision 124144)
+++ gcc/doc/trouble.texi (working copy)
@@ -234,20 +234,6 @@ you cannot successfully use @samp{$} in
to a restriction in the IBM assembler. GAS supports these
identifiers.
[EMAIL PROTECTED] VAX calling convention
[EMAIL PROTECTED] Ultrix calling convention
[EMAIL PROTECTED]
[EMAIL PROTECTED] fcall-saved
-On Ultrix, the Fortran compiler expects registers 2 through 5 to be
saved
-by function calls. However, the C compiler uses conventions compatible
-with BSD Unix: registers 2 through 5 may be clobbered by function
calls.
-
-GCC uses the same convention as the Ultrix C compiler. You can use
-these options to produce code compatible with the Fortran compiler:
-
[EMAIL PROTECTED]
--fcall-saved-r2 -fcall-saved-r3 -fcall-saved-r4 -fcall-saved-r5
[EMAIL PROTECTED] smallexample
@end itemize
@node Incompatibilities
