Re: How to handle clashes between options for different front ends?

[Brian Drummond <brian@xxxxxxxxxxxxxxxxxx>]

On Sat, 2013-02-02 at 11:38 -0800, Ian Lance Taylor wrote:
> On Sat, Feb 2, 2013 at 11:03 AM, Brian Drummond
> <brian@xxxxxxxxxxxxxxxxxx> wrote:

> The option processing has been overhauled so that the driver can do
> the right thing more often.  All the language-specific options are
> passed to the AWK script opt-gather.awk.  It produces a file
> optionlist, which is then processed by additional AWK scripts into
> options.h, options.c, and options-save.c.

optionlist contains three lines for -P and two aliased to it which look
reasonable to me.
----------------------------------------------------------------------
-no-line-commandsC ObjC C++ ObjC++ Alias(P)
-no-line-commandsFortran Alias(P)
...
PC ObjC C++ ObjC++Do not generate #line directives
PFortran
Pvhdl Joined-P<dir>	Add <dir> to the end of the vhdl library path
----------------------------------------------------------------------
options.h contains one obviously relevant line
----------------------------------------------------------------------
  OPT_P = 155,                               /* -P */
----------------------------------------------------------------------

options.c (redacted) looks screwy to me in a couple of respects:
1) OPT_P is bound to only --no-line-commands and not -P
2) Fortran, ObjC etc seem to share the VHDL definition.
--------------------------------------------------------------
...line 1029
const struct cl_option cl_options[]
{
... line 1558
  { "--no-line-commands",
    0,
    0,
    0,
    NULL, NULL, OPT_P, N_OPTS, 17, -1,
    CL_C | CL_CXX | CL_Fortran | CL_ObjC | CL_ObjCXX,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    -1, 0, CLVC_BOOLEAN, 0 },
... line 2271
  { "-P",
    "-P<dir>	Add <dir> to the end of the vhdl library path",
    0,
    0,
    NULL, NULL, N_OPTS, N_OPTS, 1, -1,
    CL_C | CL_CXX | CL_Fortran | CL_ObjC | CL_ObjCXX | CL_vhdl |
CL_JOINED,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    -1, 0, CLVC_STRING, 0 },
  { "-Q",
...
--------------------------------------------------------------

If the scripts are generating incorrect options.c, are they taking
lang-specs.h files into account or is this purely lang.opt (and/or
whatever else feeds the awk scripts) that is at fault? There may be new
things to do in lang.opt for example.

- Brian