Re: lang.opts help

[Philip Herron <redbrain@gcc.gnu.org>]

Yeah there is a patch in the list somewhere from ages ago where me and
Andi Hellmund added huge front-end documentation but it never got
reviewed.

I think i need to resurrect this again this week and fix it up and get it in.

--Phil

On 30 June 2013 22:51, Manuel López-Ibáñez <lopezibanez@gmail.com> wrote:
> Perhaps it should be documented somewhere, but where? To be honest, if
> I had to implement a GCC FE, I wouldn't even know where to start
> looking.
>
> BTW, don't look to Fortran for a good example of how to handle
> options. Fortran duplicates the common machinery, which does a lot
> more than the Fortran implementation. The same applies to diagnostics,
> don't follow Fortran, use the common machinery. In general, the C++ FE
> is probably the most modern and the best example to look at.
>
>
>
> On 30 June 2013 22:17, Philip Herron <redbrain@gcc.gnu.org> wrote:
>> Thanks so much i just never noticed this lang hook just needed to
>> return the option_lang_mask and now its all fine.
>>
>> Thanks
>>
>> --Phil
>>
>> On 28 June 2013 19:46, Manuel López-Ibáñez <lopezibanez@gmail.com> wrote:
>>>> I have been having trouble with my lang.opts i keep getting:
>>>>
>>>> hilips-MacBook:gccpy-build redbrain$ gccpy -O0 -fdump-tree-gimple t.py
>>>> -o t.o -fpy-dump-dot -fpy-gen-main
>>>> gpy1: warning: command line option =91-fpy-dump-dot=92 is valid for Python
>>>> but not for  [enabled by default]
>>>> gpy1: warning: command line option =91-fpy-gen-main=92 is valid for Python
>>>> but not for  [enabled by default]
>>>> gpy1: warning: command line option
>>>> =91-L/usr/local/lib/gcc/x86_64-apple-darwin12.3.0/4.8.0=92 is valid for
>>>> Go/Python but not for  [enabled by default]
>>>> gpy1: warning: command line option
>>>> =91-L/usr/local/lib/gcc/x86_64-apple-darwin12.3.0/4.8.0/../../..=92 is
>>>> valid for Go/Python but not for  [enabled by default]
>>>
>>> Does your python_handle_option returns true for recognized options?
>>>
>>> When you build, in the build/gcc/ directory there is an options.c
>>> file. Does it mention Python in lang_names? Do the options have the
>>> CL_Python flag?
>>>
>>> Have you defined a hook that returns the lang_mask for Python? See Fortran:
>>>
>>> fortran/f95-lang.c:#define LANG_HOOKS_OPTION_LANG_MASK  gfc_option_lang_mask
>>>
>>> BTW, you don't need to re-define Common options unless you want to
>>> completely change their meaning, which normally is a bad idea.
>>> Normally you can just re-use the results returned by the common
>>> options machinery for your own purposes.
>>>
>>> Cheers,
>>>
>>> Manuel.