[PATCH] D117853: [ELF] Parallelize --compress-debug-sections=zlib

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

In D117853#3261856 <https://reviews.llvm.org/D117853#3261856>, @dblaikie wrote:

> Is there any chance to avoid buffering the compressed output? (I guess probably not, because you need to know how large it is before you write it to the output file (if you want to parallelize writing sections, which is important no doubt))

I have asked myself this question... Unfortunately no. To have accurate estimate of sizes, we have to buffer all compressed output.
It's needed to compute sh_offset and sh_size fields of a .debug_* section. To know the size we need to compress it first (or estimate, but the compression ratio is not easy to estimate).


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