Support for objective-C PCH

[Neil Booth]

Geoffrey Keating wrote:-

> +get_ident()
> +{
> +  static char result[IDENT_LENGTH];
> +  static const char template[IDENT_LENGTH] = "gpch.010";
> +  
> +  memcpy (result, template, IDENT_LENGTH);
> +  if (strcmp (lang_hooks.name, "GNU C") == 0)
> +    result[4] = 'C';
> +  else if (strcmp (lang_hooks.name, "GNU C++") == 0)
> +    result[4] = '+';
> +  else if (strcmp (lang_hooks.name, "GNU Objective-C") == 0)
> +    result[4] = 'o';
> +  else if (strcmp (lang_hooks.name, "GNU Objective-C++") == 0)
> +    result[4] = 'O';
> +  else
> +    abort ();
> +  return result;
> +}

Can I suggest you use c_language_kind?  It seems less
fragile than string comparisons.

> +  {"@objective-c-header",
> +     "%{E|M|MM:%(trad_capable_cpp)\
> +          -lang-objc %(cpp_options) %(cpp_debug_options)}\
> +      %{!E:%{!M:%{!MM:\
> +	%{traditional|ftraditional|traditional-cpp:\
> +%eGNU Objective C no longer supports traditional compilation}\
> +	%{save-temps:cc1obj -E %(cpp_options) %b.mi \n\
> +	    cc1obj -fpreprocessed %b.mi %(cc1_options) %{gen-decls}\
> +                        -o %g.s %{!o*:--output-pch=%i.pch}\
> +                        %W{o*:--output-pch=%*}%V}\
> +	%{!save-temps:\
> +	    cc1obj %(cpp_unique_options) %(cc1_options) %{gen-decls}\
> +                        -o %g.s %{!o*:--output-pch=%i.pch}\
> +                        %W{o*:--output-pch=%*}%V}}}}", 0},

Shouldn't this handle -fno-integrated-cpp too?  A SPEC hairball 8-)

Neil.