It's really exciting to see such rapid progress being made here. Thanks
On Tue, Mar 13, 2018 at 7:31 AM, David Major <dma...@mozilla.com> wrote:
> Link xul.dll in 20 seconds with this one weird trick!
> Hi everyone,
> clang-cl builds of Firefox have come a long way, from being a hobby project
> of a few developers to running static analysis in CI for more than a year
> now. The tools are in really good shape and should be ready for broader use
> within Mozilla at this point.
> Bug 1443590 is looking into what it would take to ship official builds with
> clang-cl and lld-link, but in the meantime it's possible to do local builds
> already. I'd like to invite people who develop on Windows to give it a try.
> *** Reasons to use clang-cl and lld-link locally ***
> - Speed! lld is known for being very fast. I'm serious about 20-second
> libxuls. That's a non-incremental link, with identical code folding
> enabled. For comparison, MSVC takes me over two minutes.
> - Speed again! clang-cl will integrate with upcoming sccache/icecream work.
> - Much clearer and more actionable error messages than MSVC
> - Make your own ASan and static analysis builds (the latter need an LLVM
> before r318304, see bug 1427808)
> - Help ship Firefox with clang-cl by getting more eyes and machines on
> these tools
> *** Reasons not to use clang-cl and lld-link locally (yet) ***
> - You are testing codegen-level fixes or optimizations and need to see the
> exact bits that will be going out to users
> - lld-link currently doesn’t support incremental linking -- but with full
> linking being so fast, this might not matter
> - You do artifact builds that don't use a local compiler
> *** How do I get started? ***
> A number of build system changes have landed that make these builds much
> easier than before. For example you no longer need to use old versions of
> Note that clang-cl builds still depend on an MSVC installation for headers,
> libraries, and auxiliary build tools, so don't go uninstalling your Visual
> Studio just yet.
> If you run into any problems, please stop by #build or visit the shiny new
> Firefox Build System product in Bugzilla (formerly Core :: Build Config).
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