[lld] r193301 - [Driver] Change UniversalDriver to use TD file.

[Alex Rosenberg]

On Oct 23, 2013, at 11:56 PM, Rafael Espíndola <rafael.espindola at gmail.com> wrote:

>> core was supposed to be the "one true" flavor that would potentially be the "native" command line for lld in the absence of a need for legacy compatibility and for the future.
> 
> Is that realistic? On the clang side there was some discussion about
> adding a clean command line interface, but the added value of doing so
> seemed small.

It's where we started.

>> From http://lists.cs.uiuc.edu/pipermail/cfe-dev/2011-November/018588.html
> 
> However, the challenge then becomes "why would anyone use the 'nice'
> one"?  It is likely to get less development and features, and users of
> the compiler don't care about academic purity of the implementation
> details.  Any features of the 'nice' driver would also need to
> supported by the 'ugly' driver also, so I don't see that introducing a
> new driver is really all that useful.

Some flavors can't express everything in the command line, e.g. GNU ld uses linker scripts, whereas ld64 can do everything on the command line. The hope was that a single universal command line language would be the best future direction.

Also, the other flavors were internally translated to core command lines, so it always got tested and always had every feature.

Alex