[PATCH] D59025: Add --add-ghashes to llvm-objcopy to append a .debug$H to coff objects

Mon Mar 18 12:32:05 PDT 2019

aganea added a comment.

In D59025#1433050 <https://reviews.llvm.org/D59025#1433050>, @jhenderson wrote:

> 2. There's a real-world use-case (which could be as simple as significantly simplifying our own testing or whatever).

There's a strong industrial use-case here, which is to use MSVC for compilation and LLD for linking.
MSVC currently doesn't support (yet?) `.debug$H` streams, and this patch provides a workaround. This inherently makes linking with LLD faster, by allowing compilation with MSVC + `.debug$H` computation on remote PCs (when using distributed compilation).
Without this patch, `.debug$H` computation is done locally by LLD, which significantly increases link time.

In D59025#1428431 <https://reviews.llvm.org/D59025#1428431>, @rupprecht wrote:

> I've never heard of ghashes

Worth the read: http://blog.llvm.org/2018/01/

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https://reviews.llvm.org/D59025