[PATCH] D16092: [Coverage] Do not allocate memory for coverage map data (Linux)

[Xinliang David Li via llvm-commits]

Ok -- I will leave Mach-O change out for now then.

(for experimental purpose, you can dot this quickly by modifying .s
file generated by the compiler).

thanks,

David

On Wed, Jan 13, 2016 at 11:34 AM, Vedant Kumar <vsk at apple.com> wrote:
> vsk added a comment.
>
> Along with the compiler-rt test I think this looks fine, but caveat: I'm not a linker expert at all!
>
> After some discussion with @pete and @lgerbarg, it looks like there isn't a short term way to achieve this with Mach-O. To recap:
>
> 1. Passing in `-Wl,-dead_strip -fprofile-instr-generate -fcoverage-mapping` doesn't get rid of __llvm_covmap because the linker is conservative about sections it doesn't 'know' about.
> 2. Because this section is in the __DATA segment, it will be mapped into the process along with the rest of the segment. We could pull this out into a separate segment (along with debug info?) and experiment.
>
>
> http://reviews.llvm.org/D16092
>
>
>