Simple performance question from a newcomer

[Mike Parker via Digitalmars-d-learn]

On Tuesday, 23 February 2016 at 20:03:30 UTC, dextorious wrote:
> For instance, I am still not sure how to make it pass the -O5 
> switch to the LDC2 compiler and the impression I got from the 
> documentation is that explicit manual switches can only be 
> supplied for the DMD compiler.

If you're referring to this:

"Additional flags passed to the D compiler - note that these 
flags are usually specific to the compiler in use, but a set of 
flags is automatically translated from DMD to the selected 
compiler"

My take is that a specific set of flags are automatically 
translated (so you don't need to make a separate dflags entry for 
each compiler you support if you only use those flags), but you 
can pass any compiler-specific flags you need.