Driver help output for --sysroot.

[Iain Sandoe]

I originally had it there, but then it produces output that differs from the other sysroot options.
(happy to do either, just think it would be good to show it exists)

On 10 Jun 2014, at 13:18, Rafael Espíndola wrote:

> Shouldn't the help text go in _sysroot_EQ?
> 
> On 10 June 2014 07:23, Iain Sandoe <iain at codesourcery.com> wrote:
>> Is there some reason we don't want to own up to having the --sysroot option ?
>> 
>> If not - then how about the following?
>> Iain
>> 
>> 
>> diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
>> index 9d4ff4d..17c720e 100644
>> --- a/clang/include/clang/Driver/Options.td
>> +++ b/clang/include/clang/Driver/Options.td
>> @@ -1491,7 +1491,9 @@ def _signed_char : Flag<["--"], "signed-char">, Alias<fsigned_char>;
>> def _std : Separate<["--"], "std">, Alias<std_EQ>;
>> def _stdlib : Separate<["--"], "stdlib">, Alias<stdlib_EQ>;
>> def _sysroot_EQ : Joined<["--"], "sysroot=">;
>> -def _sysroot : Separate<["--"], "sysroot">, Alias<_sysroot_EQ>;
>> +def _sysroot : Separate<["--"], "sysroot">, Alias<_sysroot_EQ>,
>> +  HelpText<"Use <dir> as the root directory for headers and libraries">,
>> +  MetaVarName<"<dir>">;
>> def _target_help : Flag<["--"], "target-help">;
>> def _trace_includes : Flag<["--"], "trace-includes">, Alias<H>;
>> def _undefine_macro_EQ : Joined<["--"], "undefine-macro=">, Alias<U>;
>> 
>> 
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