[LLVMdev] [lld][Options] Sharing common options across flavors

[Nick Kledzik]

On Sep 18, 2013, at 12:18 PM, Shankar Easwaran <shankare at codeaurora.org> wrote:

> Hi Nick,
> 
> There are already a lot of options that are being shared across various flavors.  Adding a new option becomes a issue when that option need to available across all flavors.
> 
> As the first step, I am thinking of consolidating the common options shared across all the Unix variant flavors in CommonOptions.td.
> 
> The options that are shared between Darwin/GnuLD are :-
> 
> a) -o
> b) -L
> c) -emit-yaml
> d) --help
> e) -mllvm
> 
That would make it difficult to use OptionGroup (as darwin driver has) so the —help output is organized.  Also, the windows driver uses ‘/‘ so its entries use F<> instead of Flag<>, so I not sure how you can factor these out.  It also means that when looking at possible options, you’d have to look in two files instead of one.


> I am also thinking of adding a verbose option that would essentially control the various verbose outputs that we might want to have. For example:
> 
> lld -flavor gnu -target x86_64 --verbose=commandline,trampolines,symbols,reader,writer ....
> 
> LinkingContext will have two functions :-
> 
> setVerboseOptions(StringRef) -> stores all the verbose options in a vector.
> 
> hasVerboseOption(StringRef) -> returns true if the option is present
> 
> Thoughts on the above ?
What do you mean by “verbose”.  Is this like DEBUG_WITH_TYPE()?  

-Nick