[LLVMdev] [lld] lld build needs to have flags that specify what flavor/targets to build ?

Shankar Easwaran shankare at codeaurora.org
Tue Oct 7 16:37:04 PDT 2014

On 10/7/2014 5:53 PM, Michael Spencer wrote:
> On Tue, Oct 7, 2014 at 2:31 PM, Rui Ueyama <ruiu at google.com> wrote:
>> On Tue, Oct 7, 2014 at 2:22 PM, Shankar Easwaran <shankare at codeaurora.org>
>> wrote:
>>> On 10/7/2014 4:10 PM, Nick Kledzik wrote:
>>>> Shankar,
>>>> Can you give provide a scenario where you want this?  I’m not sure what
>>>> you want here.
>>> a) LLVM could be built  just for one target(LLVM_TARGETS_TO_BUILD)
>>> b) With LTO this case might happen more often, where an user would have
>>> compiled LLVM just for one architecture and lld would support other
>>> architectures that LLVM would not support.
>>> c) Printing all the targets/flavors that the linker currently supports.
>> What's the motivation to build a LLD only for some specific target? Size?
>> LLD is not a large executable. When compiled with Release, it's a few
>> megabyte binary. If you kill architectures that you don't need, you won't
>> save that much.
>> On the other hand, making something configurable always comes with cost.
>> It's not hard to imagine that we would get a bug reports that "feature X
>> didn't work if we build LLD only for target Y."
> Agreed. I'm fine with having a runtime way to not expose specific
> targets in the case you want to ship lld to customers and don't want
> to imply you support the other targets.
This would be nice too. Could you please elaborate on the design ?

Shankar Easwaran-- Qualcomm Innovation Center, Inc. is a member of Code 
Aurora Forum, hosted by the Linux Foundation

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