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Chandler Carruth 2787089247 Switch to a Bazel-based runtimes build, and add bootstrapping (#6989 )

This also switches to a more Bazel-based install layout, skipping the
FHS-based synthetic layout. The FHS-based layout is still reconstructed
explicitly when building an installable tar-ball.

The biggest change is to configure the just-built install as a Bazel
toolchain, including allowing it to build its own runtime libraries as
native Bazel libraries. This removes the need for a monolithic runtimes
build, all of that code logic is removed.

This should also pave the way to using the just-built toolchain for
doing a full 3-stage bootstrap. Building the 2nd stage is included here
as it was a particularly effective way to test that the Bazel
integration was fully working. Adding a 3rd-stage check for stability is
future work, but should be pretty easy.

There is a down-side: this uses the busybox to do the runtimes
compilation, which means they will be re-built after ~any change to
Carbon. However, the integration with Bazel should largely pay for this,
and we can continue to factor the tests away from depending on built
runtimes in most cases.

Now that we're building and testing the runtimes more directly, this
surfaced a problem with the layout of runtimes on macOS that is fixed
here. All of the Darwin OSes use a custom layout for their resource
directory compared to other targets. We now model this in both the C++
built runtimes and the Bazel built runtimes.

Assisted-by: Gemini via Antigravity

2026-03-31 23:38:03 +00:00

auto_label_prs.yaml

Update action versions (#6848 )

2026-03-06 22:19:44 +00:00

clangd_tidy.yaml

Allow uploads.github.com (#6866 )

2026-03-09 18:21:08 +00:00

discord_wiki.yaml

Update action versions (#6848 )

2026-03-06 22:19:44 +00:00

gh_pages_ci.yaml

Update action versions (#6848 )