[bazel] Build with LLVM #8414
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[bazel] Build with LLVM #8414
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we should probs pull in x11 from bcr? tbh probably imgui/glfw from bcr too
auscompgeek
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Nov 22, 2025
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| # TODO(davo): update version after the next release of toolchains_llvm after 1.5.0 | ||
| http_archive( | ||
| name = "toolchains_llvm", | ||
| integrity = "sha256-Ht0UsdgsySFX+H7AU3TS992uZr8nV5TP60lADgKeP7s=", | ||
| strip_prefix = "toolchains_llvm-cebf1ed19db1521bcaae489a40dd736d50e9302f", | ||
| url = "https://github.com/bazel-contrib/toolchains_llvm/archive/cebf1ed19db1521bcaae489a40dd736d50e9302f.tar.gz", | ||
| ) |
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There's no toolchains_llvm release that supports the extra_*_flags parameters yet.
auscompgeek
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Rebuilding the world requires more disk space.
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libtinfo5 is a library you can install (or patch into the llvm install) on 22.04. |
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auscompgeek
commented
Nov 22, 2025
| "darwin-aarch64": CONLY_FLAGS, | ||
| "darwin-x86_64": CONLY_FLAGS, | ||
| "linux-aarch64": CONLY_FLAGS, | ||
| "linux-x86_64": CONLY_FLAGS, |
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@AustinSchuh was there a particular reason bazel-contrib/toolchains_llvm#435 doesn't allow specifying a global conly_flags default with the empty string key like the other params?
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No reason other than it probably didn't exist when that code was originally written 6 years ago.
AustinSchuh
approved these changes
Nov 22, 2025
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Bazel bits look good. In general, I'm a big clang fan, but I can't judge if that is good for this project or not. |
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This pulls a hermetic LLVM toolchain into the Bazel workspace, for use in our Linux x86-64 builds. This removes our dependency on the host OS C++ toolchain, and hence makes building in a container largely redundant.
Since we no longer build in a container, this also frees up some disk space for our CI builds, however this is somewhat displaced by the size of the toolchain download.
Note that this doesn't register the toolchain with an isolated sysroot, so this now relies on the host image for its sysroot.